Flood of June 26–29, 2006, Mohawk, Delaware and Susquehanna ...

U.S. Department of the InteriorU.S. Geological Survey

Open-File Report 2009–1063

Prepared in cooperation with theFederal Emergency Management Agency

Flood of June 26–29, 2006, Mohawk, Delaware andSusquehanna River Basins, New York

Cover. Bridge (background image): Riverside Drive bridge, Binghamton, NY, on June 28, 2006. Photo courtesy of Jim DeVona. Mohawk River basin: Fonda Speedway near Fonda, NY, on June 28, 2006. Photo courtesy of Ryan Peterson and Valley View Aviation Delaware River basin: Narrowsburg, NY, inundated by the floodwaters of the Delaware River on June 28, 2006. Photo courtesy of the Times Herald-Record, taken by staff photographer Jeff Goulding. Susquehanna River basin: Oneonta, NY, municipal complex and wastewater treatment plant taken from Army National Guard helicop-ter on June 29, 2006. Photo courtesy of The Daily Star, taken by photographer Anita Briggs.

Flood of June 26–29, 2006, Mohawk, Delaware, and Susquehanna River Basins, New York

By Thomas P. Suro, Gary D. Firda, and Carolyn O. Szabo

Prepared in cooperation with the Federal Emergency Management Agency

Open-File Report 2009–1063

U.S. Department of the InteriorU.S. Geological Survey

U.S. Department of the InteriorKEN SALAZAR, Secretary

U.S. Geological SurveyMarcia K. McNutt, Director

U.S. Geological Survey, Reston, Virginia: 2009

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Suggested citation:Suro, T.P., Firda, G.D. and Szabo, C.O. 2009, Flood of June 26–29, 2006, Mohawk, Delaware, and Susquehanna River Basins, New York: U.S. Geological Survey Open-File Report 2009–1063, 354p. Available online at http://pubs.usgs.gov/ofr/2009/1063

iii

Figures 1A. Map showing cumulative 4-day rainfall for the storm of June 26–29, 2006, and

pertinent geographic features of New York .............................................................................3 1B. Map showing daily rainfall totals for the storm of June 26–29, 2006, and pertinent

geographic features of New York ..............................................................................................4 1C. Map showing total rainfall in the Mohawk River basin, NY, and surrounding area

for the storm of June 26–29, 2006 ...............................................................................................5 1D. Map showing total rainfall in the Delaware River basin, NY, and surrounding area

for the storm of June 26–29, 2006 ...............................................................................................6 1E. Map showing total rainfall in the Susquehanna River basin, NY, and surrounding

area for the storm of June 26–29, 2006 .....................................................................................7

Contents

Abstract ...........................................................................................................................................................1Introduction.....................................................................................................................................................1Storm of June 26–29, 2006 ............................................................................................................................2

Antecedent Conditions ........................................................................................................................2Precipitation...........................................................................................................................................2

Flood of June 27–29, 2006, Discharge and Frequency ...........................................................................12Mohawk River Basin ..........................................................................................................................15Delaware River Basin.........................................................................................................................32Susquehanna River Basin .................................................................................................................36

Effects of Reservoirs on Flooding .............................................................................................................47Mohawk River Basin ..........................................................................................................................47Delaware River Basin.........................................................................................................................47Susquehanna River Basin .................................................................................................................52

Comparison of the 2006 Flood to Historic Floods ...................................................................................53Mohawk River Basin ..........................................................................................................................53Delaware River Basin.........................................................................................................................53Susquehanna River Basin .................................................................................................................59

Peak Water-Surface Elevations at Flood Study Sites ............................................................................59Flood Damage ...............................................................................................................................................90Summary........................................................................................................................................................91Acknowledgements .....................................................................................................................................91Selected References ...................................................................................................................................94Appendix 1. Site Descriptions and High-Water Marks at Study Sites, Flood of

June 26–29, 2006, in the Mohawk, Delaware, and Susquehanna River Basins, New York ..........................................................................................................................................99

Appendix 2. Comparison of High-Water Marks and Photographs at Selected Study Sites, Floods of September 18–19, 2004, and June 26–29, 2006, Delaware River Basin, New York ............................................................................................................................323

Appendix 3. Selected Photographs of Flood Damage During the Flood of June 26–29, 2006, Mohawk, Delaware, and Susquehanna River Basins, New York ..................331

iv

2A. Graph showing cumulative hourly rainfall during June 25–28, 2006, recorded at the National Weather Service hourly recording station at Claryville, NY. .................................9

2B. Map showing cumulative hourly rainfall during June 25–28, 2006, recorded at the National Weather Service office at Binghamton, NY. ............................................................9

2C. Map showing cumulative hourly rainfall during June 23–28, 2006, recorded at the New York City Department of Environmental Protection station at Cannonsville Reservoir, NY. ...............................................................................................................................10

2D. Map showing cumulative hourly rainfall during June 25–28, 2006, recorded at Albany International Airport, NY...............................................................................................10

3A. Map showing total precipitation in the Susquehanna River basin and surrounding area for the storms of March 9–22, 1936 ................................................................................14

3B. Map showing total rainfall in New York and surrounding area for the storm of June 19–23, 1972 ...................................................................................................................................15

4A. Map showing locations of selected U.S. Geological Survey stream-gaging stations in the Mohawk River basin, NY, and surrounding area ........................................................16

4B. Map showing locations of selected U.S. Geological Survey stream-gaging stations in the Delaware River basin, NY, and surrounding area ......................................................17

4C. Map showing locations of selected U.S. Geological Survey stream-gaging stations in the Susquehanna River basin, NY, and surrounding area. ..............................................18

5A. Graph showing peak discharges for the flood of June 26–29, 2006, and previous maximum known discharge at selected stream-gaging stations in the Hudson River basin, NY, as a function of drainage area. ...................................................................24

5B. Graph showing peak discharges for the flood of June 26–29, 2006, and previous maximum known discharge at selected stream-gaging stations in the Delaware River basin, NY, as a function of drainage area.....................................................................25

5C. Graph showing peak discharges for the flood of June 26–29, 2006, and previous maximum known discharge at selected stream-gaging stations in the Susquehanna River basin, NY, as a function of drainage area ...........................................26

6A. Map showing peak discharge recurrence intervals at selected U.S. Geological Survey stream-gaging stations in the Mohawk River basin, NY, for the flood of June 26–29, 2006 .........................................................................................................................27

6B. Map showing peak discharge recurrence intervals at selected U.S. Geological Survey stream-gaging stations in the Delaware River basin, NY, for the flood of June26–29, 2006 ..........................................................................................................................28

6C. Map showing peak discharge recurrence intervals at selected U.S. Geological Surveystream-gaging stations in the Susquehanna River basin, NY, for the flood of June 26–29, 2006 .........................................................................................................................29

7A. Graph showing annual peak discharges through 2006, and discharges of the 10-, 50-, and 100-year recurrence intervals for selected stations in the Mohawk River basin, NY ............................................................................................................................30

7B. Graph showing annual peak discharges through 2006, and discharges of the 10-, 50-, and 100-year recurrence intervals for selected stations in the Delaware River basin, NY ............................................................................................................................33

7C. Graph showing annual peak discharges through 2006, and discharges of the 10-, 50-, and 100-year recurrence intervals for selected stations in the Susquehanna River basin, NY ..................................................................................................40

8. Graph showing discharge hydrographs for selected stream-gaging stations in the (A–1) Mohawk River basin, NY, June 25–30, 2006, (B–1 to B–5) Delaware River basin, NY, June 25–30, 2006, and (C–1 to C–2) Susquehanna River basin, NY, June 25–30, 2006 .........................................................................................................................45

v

9A–1. Graph showing fifteen minute inflow, and water-surface elevation at the Hinkley Reservoir, NY, June 26–30, 2006 ...............................................................................................48

9A–2. Graph showing fifteen minute inflow, outflow, diversions and water-surface elevation at the Schoharie Reservoir, NY, June 26–30, 2006 ...............................................48

9B–1. Graph showing fifteen minute inflow, outflow, diversions and water-surface elevation at the Pepacton Reservoir, NY, June 26–30, 2006 ................................................50

9B–2. Graph showing fifteen minute inflow, outflow, diversions and water-surface elevation at the Cannonsville Reservoir, NY, June 26–30, 2006 ...........................................50

9B–3. Graph showing fifteen minute inflow, outflow, diversions and water-surface elevation at the Neversink Reservoir, NY, June 26–30, 2006 ..............................................51

9C–1. Graph showing fifteen minute outflow and water-surface elevation at the East Sidney Lake, NY, June 26–July 1, 2006 ....................................................................................54

9C–2. Graph showing fifteen minute discharges at selected stream-gaging stations upstream and downstream of Whitney Point Lake and water-surface elevation at Whitney Point Lake, NY, June 26–30, 2006..............................................................................54

10A. Graph showing discharge hydrographs for selected historic floods at (1) the Mohawk River nearLittle Falls, NY, and (2) the Mohawk River at Cohoes, NY, stream-gaging stations. .............................................................................................................55

10B. Graph showing discharge hydrographs for selected stream-gaging stations in the Delaware River basin, NY, for the June 2006 and August 1955 floods ...............................57

10C. Graph showing discharge hydrographs for selected historic floods at (1) the Susquehanna River near Waverly, NY, and (2) the Susquehanna River at Conklin, NY, stream-gaging stations .......................................................................................................60

11. Graph showing water-surface elevation in the Pepacton Reservoir, NY, during August-October 1955, January 1996, and June 2006 ............................................................62

12A. Map showing locations of 22 high-water-mark sites chosen for study in the Mohawk River basin, NY, for the flood of June 26–29, 2006 ................................................63

12B. Map showing locations of 44 high-water-mark sites chosen for study in the Delaware River basin, NY, for the flood of June 26–29, 2006...............................................64

12C. Map showing locations of 38 high-water-mark sites chosen for study in the Susquehanna River basin, NY, for the flood of June 26–29, 2006 .......................................65

13A. Graph showing peak water-surface elevations at selected sites in the Mohawk River basin, NY, during flood of June 26–29, 2006, and flood- recurrence-interval elevations from Federal Emergency Management Agency flood-insurance studies .............................................................................................................78

13B. Graph showing peak water-surface elevations at selected sites in the Delaware River basin, NY, during flood of June 26–29, 2006, and flood- recurrence-interval elevations from Federal Emergency Management Agency flood-insurance studies .............................................................................................................79

13C. Graph showing peak water-surface elevations at selected sites in the Susquehanna River basin, NY, during flood of June 26–29, 2006, and flood- recurrence-interval elevations from Federal Emergency Management Agency flood-insurance studies .............................................................................................................85

14A. Photographs of Collapse of Interstate Route 88 over Carrs Creek near Unadilla (Exit 10), NY, on June 28, 2006. Bottom–Carrs Creek and washed-out culvert at Interstate Route 88 near Unadilla (exit 10), NY, on June 28, 2006 .......................................92

14B. Photographs of Susquehanna River floodwaters overtop floodwall along North Shore Drive, Binghamton, NY, on June 28, 2006, and Susquehanna River floodwaters overflow Washington Street pedestrian bridge, Binghamton, NY, on June 28, 2006 ..........................................................................................................................93

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Tables 1. Total rainfall for the storm of June 26–29, 2006, at selected locations in New York

and surrounding areas. .............................................................................................................11 2A. Rainfall-frequency relations for storms of 3-, 6-, 12-, and 24-hour duration at

selected locations in New York ................................................................................................13 2B. Rainfall-frequency relations for storms of 4-day duration at selected locations in

New York ......................................................................................................................................14 3. Period-of-record peak discharges and peak discharges during the flood of June

26–29, 2006, at selected U.S. Geological Survey stream-gaging stations in New York and surrounding areas. ....................................................................................................19

4A. Peak elevations and peak discharges for selected historical floods and the June 26–29, 2006, flood at selected U.S. Geological Survey stream-gaging stations in the Mohawk River basin, NY .................................................................................56

4B. Peak elevations and peak discharges for selected historical floods and the June 26-29, 2006, flood at selected U.S. Geological Survey stream-gaging stations in the Delaware River basin, NY ...................................................................................................58

4C. Peak elevations and peak discharges for selected historical floods and the June 26-29, 2006, flood at selected U.S. Geological Survey stream-gaging stations in the Susquehanna River basin, NY. ..........................................................................................60

5A. Peak water-surface elevations at 22 high-water-mark sites and 5 U.S. Geological Survey stream-gaging stations in the Mohawk River basin, NY, during the flood of June 26–29, 2006, and corresponding flood elevations for 10-, 50-, 100-, and 500-year flood-recurrence intervals ........................................................................................67

5B. Peak water-surface elevations at 44 high-water-mark sites and 10 U.S. Geological Survey stream-gaging stations in the Delaware River basin, NY, during the flood of June 26-29, 2006, and corresponding flood elevations for 10-, 50-, 100-, and 500-year flood-recurrence intervals ........................................................................................69

5C. Peak water-surface elevations at 38 high-water-mark sites and 14 U.S. Geological Survey stream-gaging stations in the Susquehanna River basin, NY, during the flood of June 26–29, 2006, and corresponding flood elevations for 10-, 50-, 100-, and 500-year flood-recurrence intervals ................................................................................73

vii

Conversion Factors, Datum, and AcronymsMultiply By To obtain

Length

inch (in.) 2.54 centimeter (cm)foot (ft) 0.3048 meter (m)mile (mi) 1.609 kilometer (km)

Area

acre 4,047 square meter (m2)acre 0.4047 hectare (ha)acre 0.4047 square hectometer (hm2) acre 0.004047 square kilometer (km2)square foot (ft2) 929.0 square centimeter (cm2)square foot (ft2) 0.09290 square meter (m2)square mile (mi2) 259.0 hectare (ha)square mile (mi2) 2.590 square kilometer (km2)

Volume

million gallons (Mgal) 3,785 cubic meter (m3)cubic foot (ft3) 28.32 cubic decimeter (dm3) cubic foot (ft3) 0.02832 cubic meter (m3) acre-foot (acre-ft) 1,233 cubic meter (m3)acre-foot (acre-ft) 0.001233 cubic hectometer (hm3)

Flow rate

acre-foot per day (acre-ft/d) 0.01427 cubic meter per second (m3/s)cubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s)cubic foot per second per square mile

[(ft3/s)/mi2] 0.01093 cubic meter per second per square

kilometer [(m3/s)/km2]million gallons per day (Mgal/d) 0.04381 cubic meter per second (m3/s)

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:

°F = (1.8 × °C)+32

Temperature in degrees Fahrenheit (°F) may be converted to degrees Celsius (°C) as follows:

°C = (°F - 32)/1.8

Vertical coordinate information is referenced to National Geodetic Vertical Datum of 1929 (NGVD 29).

Horizontal coordinate information is referenced to North American Datum of 1983 (NAD 83).

Barge Canal Datum (BCD) is site specific and there are local conversion factors, in feet, to National Geodetic Vertical Datum of 1929.

viii

Acronyms Used in This Report

FEMA Federal Emergancy Management Agency

NGS National Geodetic Survey

NWS National Weather Service

NYCDEP New York City Department of Environmental Protection

NYSDOT New York State Department of Transportation

PPL Pennsylvania Power and Light Corporation

USGS U.S. Geological Survey

Flood of June 26–29, 2006, Mohawk, Delaware, and Susquehanna River Basins, New York

By Thomas P. Suro, Gary D. Firda, and Carolyn O. Szabo

IntroductionMajor flooding occurred during June 26–29, 2006, across

New York State and adjacent states resulting from a stalled frontal boundary that funneled tropical moisture over New York, New Jersey, and Pennsylvania. Prior to June 2006, streamflow conditions in the Mohawk and Delaware River basins generally were within the normal range, and conditions in the Susquehanna River basin were in the dry range. Heavy rains spread from south to north across central New York from June 26 through June 29, 2006, producing rainfall totals that generally ranged from 2 to greater than 7 in. in many areas with localized rainfall totals of greater than 10 to 13 in. in several parts of southern New York. The National Weather Service (NWS) recorded rainfall amounts of 3.62 in. at Albany, 7.13 in. at Binghamton, and 13.36 in. at Walton, NY (National Oceanic and Atmospheric Administration, 2006a). The storm and flooding claimed four lives in New York, destroyed or damaged thousands of homes and businesses, and closed hundreds of roads and highways.

Several USGS stream-gaging stations along the Mohawk, Delaware, and Susquehanna River basins recorded peak discharges with a recurrence interval of greater than 100-years during the June 2006 flood. A state of emergency was declared in many counties in southern New York including Broome, Chenango, Delaware, Montgomery, Sullivan, and Ulster. According to the New York State Department of Transportation (New York State Department of Transportation, 2006), on Wednesday, June 28, 2006, roads were closed at 138 locations throughout New York because of flooding, including approximately 275 mi of the New York Interstate Highway System (New York State Department of Transportation, 2006). Thousands of people were asked to evacuate their homes because of rising floodwaters in New York, New Jersey, and Pennsylvania. U.S. National Guard and State helicopters were dispatched to rescue victims from their rooftops as the floodwaters washed out roads and damaged homes and businesses. On July 1, 2006, the head of the Department of Homeland Security, Federal Emergency Management Agency (FEMA), announced that a major disaster had been declared for New York to supplement State and local recovery efforts in the areas struck by severe storms

AbstractA stalled frontal system caused tropical moisture to be

funneled northward into New York, causing severe flooding in the Mohawk, Delaware, and Susquehanna River basins during June 26–29, 2006. Rainfall totals for this multi-day event ranged from 2 to 3 inches to greater than 13 inches in southern New York. The storm and flooding claimed four lives in New York, destroyed or damaged thousands of homes and businesses, and closed hundreds of roads and highways. Thousands of people evacuated their homes as floodwaters reached new record elevations at many locations within the three basins. Twelve New York counties were declared Federal disaster areas, more than 15,500 residents applied for disaster assistance, and millions of dollars in damages resulted from the flooding. Disaster-recovery assistance for individuals and businesses adversely affected by the floods of June 2006 reached more than $227 million.

The National Weather Service rainfall station at Slide Mountain recorded storm totals of more than 8 inches of rainfall, and the stations at Walton and Fishs Eddy, NY, recorded storm totals of greater than 13 inches of rainfall. The U.S. Geological Survey (USGS) stream-gaging stations at Mohawk River at Little Falls, West Branch Delaware River at Hale Eddy, and Susquehanna River at Vestal, NY, among others, recorded peak discharges of 35,000 ft3/s, 43,400 ft3/s, and 119,000 ft3/s respectively, with greater than 100-year recurrence intervals. The peak water-surface elevation 21.47 ft and the peak discharge 189,000 ft3/s recorded on June 28, 2006, at the Delaware River at Port Jervis stream-gaging station were the highest recorded since the flood of August 1955. At the Susquehanna River at Conklin, NY, stream-gaging station, which has been in operation since 1912, the peak water-surface elevation 25.02 ft and peak discharge 76,800 ft3/s recorded on June 28, 2006, exceeded the previous period-of-record maximums that were set during the flood of March 1936. Documented peak water-surface elevations during the June 2006 flood at many study sites in the Mohawk, Delaware, and Susquehanna River basins exceeded the 100-year flood-profile elevations determined in the flood-insurance studies prepared by the Federal Emergency Management Agency.

2 Flood of June 26–29, 2006, Mohawk, Delaware, and Susquehanna River Basins, New York

and flooding that began on June 26, 2006 (Federal Emergency Management Agency, 2006). Twelve counties in New York were named in the disaster declaration, and by July 6, 2006, more than 3,200 individuals had registered for disaster assistance. On July 12, 2006, $2.2 million was initially approved to assist flood victims in New York with housing.

Nearly $30 million was approved for disaster assistance by July 25, 2006. The initial $2.2 million in disaster assistance for housing was increased to $16.2 million, $10.4 million was added for low-interest loans to homeowners, and additional funding of about $3.1 million was approved for other needs and assistance. More than 15,500 individuals had applied for assistance by December 18, 2006. On December 29, 2006, FEMA announced that more than $227 million had been approved or obligated for assistance to residents and businesses for disaster-related expenses not covered by insurance and for State and local agencies to repair flood damages and rebuild infrastructure damaged during the flood (Federal Emergency Management Agency, 2006). The USGS, in cooperation with FEMA, conducted a study to characterize the effects of the 4-day storm.

This report documents the flooding in the Mohawk, Delaware, and Susquehanna River basins in New York. Included in this report are rainfall data, reservoir water-surface elevations, discharge hydrographs, peak discharges, and updated flood-frequency data for selected USGS stream-gaging stations. This report also documents peak water-surface elevations at 29 USGS stream-gaging stations and 104 study sites along the Mohawk River and selected tributaries; the East, West, and main branches of the Delaware River and selected tributaries downstream to Port Jervis, NY; and the Susquehanna River and selected tributaries downstream to Athens, PA. Rainfall amounts, streamflow discharges, updated flood frequencies, and water-surface elevations for streams and reservoirs are presented in figures and tables. Peak surface-water elevations and peak discharges are compared to those of historical floods. FEMA personnel, in cooperation with the USGS, selected the 104 study sites in the Mohawk, Delaware, and Susquehanna River basins included in this report. Peak water-surface elevations were surveyed, described, and photographed by USGS and URS Corporation personnel. Descriptions and maps of individual sites are presented in Appendix 1. Comparisons of peak water-surface elevations at selected study sites in the Delaware River basin between the September 2004 and the June 2006 floods are shown in Appendix 2. Photographs of flood damage to selected areas in the Mohawk, Delaware, and Susquehanna River basins are shown in Appendix 3. Peak water-surface elevations at many study sites exceeded the 100-year flood-profile elevations and at some study sites exceeded the 500-year flood-profile elevations as documented in flood-insurance studies by FEMA. Peak-of-record discharges were recorded at several USGS stream-gaging stations in each of the studied basins.

Storm of June 26–29, 2006

Antecedent Conditions

Prior to June 2006, streamflow conditions in the Mohawk and Delaware River basins were generally in the normal range, and streamflow conditions in the Susquehanna River basin were in the dry range. The NWS reported precipitation totals for May 2006 that ranged from 25 to 95 percent of normal across parts of the lower Delaware and Susquehanna River basins. Precipitation in the Mohawk and Hudson River basins ranged from 25 to more than 100 percent of normal for the month of May 2006 (National Oceanic and Atmospheric Administration, 2006d). Storm activity started to pick up during the first part of June with numerous storm systems moving across the State of New York. Widespread rainfall from these systems was generally less than 0.75 in.; however, a couple of storms produced about 1.5 in. of rainfall in several broad areas in western and southeastern New York. The period of June 16–22, 2006, was relatively calm with respect to precipitation. Rainfall amounts across the three basins were generally less than 0.50 in.

Precipitation

The daily mean flow at the USGS stream-gaging stations Mohawk River at Little Falls, West Branch Delaware River at Walton, and the Susquehanna River at Conklin were in the normal range on June 1, 2006. The daily mean flow on June 1, 2006, at the USGS stream-gaging station East Branch Delaware River at Margaretville was at a level exceeded less than 10 percent of the time. On Friday, June 23, a cold front moved through Pennsylvania, New Jersey, and southeastern New York. Rainfall totals from this event were light to moderate, but this weather pattern continued into the following week. Rain increased on June 25 into June 26 with daily rainfall totals of 1 to 3 in. reported in southeastern New York. On Tuesday, June 27, a frontal boundary characterized by low pressure was centered over the Midwest, and a high pressure system centered off of the southern coast of New Jersey stalled over the region. The opposite rotations of these two systems worked together to channel tropical moisture northward directly over central New York and the Susquehanna, Delaware, and Mohawk River basins. Heavy rains spread from south to north across New York from June 26 through June 29, 2006. Cumulative 4-day rainfall totals across New York ranged from less than 2 in. to greater than 12 in. (fig. 1A) and daily rainfall totals for June 26 to June 29 ranged from less than 1 in. to greater than 6 in. (fig. 1B).

This storm system produced widespread rainfall amounts of greater than 5 in. in the three basins; isolated areas received rainfall in excess of 10 in. in a 4-day period. Rainfall amounts for the storm of June 26–29 at selected sites in the Mohawk,

Storm of June 26–29, 2006 3

74°76°

44°

42°

Less than or equal to 2

2.01 – 4

4.01 – 6

6.01 – 8

8.01 – 10

10.01 – 12

Greater than 12

Base from U.S. Geological Survey digital data, 1:100,000, 1983Universal Transverse Mercator Projection, Zone 18,North American Datum (NAD) 1983

15

0 30 KILOMETERS15

30 MILES0

EXPLANATIONArea of equalrainfall, in inches

Drainage-basinboundary

PENNSYLVANIA

NEW YORK

Utica

Elmira

Ithaca

AlbanyCortland

Syracuse

Watertown

Binghamton

Port Jervis

NEWJERSEY

Delaware River basin

Mohawk River basin

Susquehanna River basin

Walton

DeltaDam

PlatteClove

East Jewett

Rockdale

FishsEddy

Figure 1A. Cumulative 4-day rainfall for the storm of June 26–29, 2006, and pertinent geographic features of New York.


PENNSYLVANIA

Albany

NEW YORK

NEWJERSEY

74°76°

43°

42°

0 40 MILES

0 40 KILOMETERSLess than or equal to 11.01 – 22.01 – 33.01 – 4

4.01 – 55.01 – 6Greater than 6

EXPLANATIONArea of equal rainfall, in inches

Drainage-basin boundary

Albany

74°76°

43°

42°

PENNSYLVANIA

NEW YORK

NEWJERSEY

Albany

PENNSYLVANIA

NEW YORK

NEWJERSEY

74°76°

43°

42°

Albany

PENNSYLVANIA

NEW YORK

NEWJERSEY

43°

42°

74°76°

JUNE 26 JUNE 27

JUNE 28 JUNE 29

Delaware Riverbasin

Mohawk River basin


Delaware Riverbasin

Mohawk River basin


Delaware Riverbasin

Mohawk River basin


Delaware Riverbasin

Mohawk River basin



Figure 1B. Daily rainfall totals for the storm of June 26–29, 2006, and pertinent geographic features of New York.


LewisHamilton

Oneida

Herkimer

Delaware

Ulster

Otsego

Warren

Essex

Greene

SaratogaFulton

Albany

Chenango

Columbia

Schoharie

Sullivan

Madison

Dutchess

Broome

Montgomery

Rensselaer

Was

hing

ton

Schenectady

Jefferson

PENNSYLVANIA

CO

NN

EC

TIC

UT

MA

SSA

CH

USE

TT

S

Utica

Albany

Oneonta

Amsterdam

LittleFalls

Rome

Canajoharie

Cohoes

Schoharie

Gilboa

NEW YORK

6

4

8

10

12

4

6

4

8

10

6

44

73°45'75°

43°45'

42°30'

East C

anad

a C

reek

Schoharie Creek

West Canada Creek

HinckleyReservoir

DeltaReservoir


15

0 30 KILOMETERS15

30 MILES0

EXPLANATIONMohawk River basin boundary

Line of equal rainfall, in inches

Site number and rainfallamount, in inches

Town or city

4

(29)5.72

Cable s k i ll Cree k

Mo h a w k R i v e r

(24)6.29

(31)5.43 (33)

5.30

(15)7.99

(19)7.46

(7)10.58

(6)11.68

(39)4.37

(28)5.78

(45)3.64

(29)5.72

(30)5.45

(5)11.78

(36)4.58

(54)2.19

(35)5.08

(46)3.62

(51)2.98

(32)5.37

(23)6.74

(38)4.37

(3)13.36

(12)8.11

(18)7.53

(22)6.87

(42)3.96

(4)13.28

(11)8.30

(13)8.10

(49)3.04

(50)3.00

(16)7.79

Figure 1C. Total rainfall in the Mohawk River basin, NY, and surrounding area for the storm of June 26–29, 2006. (Precipitation sites listed in table 1. Additional National Weather Service rainfall data and provisional spotter rainfall data used to develop map.)


Neversink River

Dyberry Creek

Wes t B ranch Lackaw

axen River

Middle Creek

PromptonReservoir

Shoh

ola C

r.

Gen. EdgarJadwin Reservoir

Wal

lenp

aupa

ck C

r.

PENNSYLVANIA

NEW JERSEY

Delaware

Pike

Wayne

Sullivan

Ulster

Orange

Sussex

Otsego

Chenango

Monroe

Greene

Schoharie

Lackawanna

PassaicLuzerne

Oneonta

Middletown

Carbondale

Walton

Sidney

Hancock

Margaretville

Barryville

Hale Eddy

Port Jervis

Deposit

Stilesville

Downsville

FishsEddy

NEW YORK

Susquehanna

Broome

Claryville

75°

42°30'

41°15'

CannonsvilleReservoir Pepacton Reservoir

NeversinkReservoir

Schoharie Reservoir

LakeWallenpaupack

Base from U.S. Geological Survey digital data, 1:100,000, 1983Universal Transversal Mercator Projection, Zone 18,North American Datum (NAD) 1983

10

0 20 KILOMETERS10

20 MILES0

Hal

fway

B

rook

Mongaup R

iver

Delaware River

L ackawaxen R iver

Wes

t Branch Delaware R

iver

East Branch D

elaware River

Beaver Kill

N. B

ranch Cal

licoo

n C

r.

Willowem o c Cr

eek

LittleBeaverKill

E. Bra nc

h C

allico

on Cr.

(9)9.16

(24)6.29

(31)5.43

(27)5.85

(19)7.46

(7)10.58

(6)11.68

(2)13.67

(1)14.64

(40)4.29

(12)8.11

(4)13.28

(25)6.28

(16)7.79

(3)13.36

(18)7.53

(22)6.87 (42)

3.96

(13)8.10

4

6

4

8

10

12

8

4

6

8

10

12

EXPLANATIONDelaware River basin boundary


Site number and rainfall amount, in inches

Town or city

4(40)4.29

Figure 1D. Total rainfall in the Delaware River basin, NY, and surrounding area for the storm of June 26–29, 2006. (Precipitation sites listed in table 1. Additional National Weather Service rainfall data and provisional spotter rainfall data used to develop map.)


Whitney Point Lake

East Sidney Lake

Otselic

Rive

r

S u s q u e h a n n a R i v e r

Una

dill a

R

iver

Chenango R iver

Tioughnioga River

Oneida

Delaware

Otsego

Wayne

Sullivan

Oswego

Tioga

Broome

Herkimer

Cayuga

Chenango

Pike

Bradford

Madison

Onondaga

Susquehanna

Cortland

Tompkins

Wyoming

Sullivan

Hamilton

Fulton

Luzerne

Orange

Ulster

Lewis

Lackawanna

Scho

harie

Montgomery

Sussex

Seneca

Greene

Lycoming

Schu

yler

Oneonta

Cortland

BinghamtonOwego

Waverly

UnadillaWhitneyPoint Sidney

Ithaca

Bainbridge

Cincinnatus

Vestal

Conklin

Athens

6

8

10

12

12

10

8

2

4

6

4

6

6

6

8

4

6

(9)9.16

(31)5.43

(15)7.99

(21)7.13

(47)3.26

(27)5.85

(26)6.04

(19)7.46

(14)8.10

(10)8.34

(7)10.58

(6)11.68

(2)13.67

(1)14.64

(28)5.78

(23)6.74

(3)13.36

(34)5.27

(18)7.53

(4)13.28

(13)8.10

(16)7.79

(43)3.86

(37)4.45

(22)6.87

75°76°10'

43°

41°50'


15

0 30 KILOMETERS15

30 MILES0

PENNSYLVANIA

NEW JERSEY

NEW YORK

EXPLANATIONSusquehanna River basin boundary


Site number and rainfallamount, in inches

Town or city

4

(28)5.78

Figure1E. Total rainfall in the Susquehanna River basin, NY, and surrounding area for the storm of June 26–29, 2006. (Precipitation sites listed in table 1. Additional National Weather Service rainfall data and provisional spotter rainfall data used to develop map.)


Delaware, and Susquehanna River basins are shown in figures 1C–E.

Cumulative hourly data recorded at the NWS precip-itation station in Claryville, NY, describe a moderately heavy rain in the late morning hours on June 26, then a sustained rain through June 27 (fig. 2A). A heavy burst of rain was recorded from late in the evening on June 27 through the first 8 hours of June 28. This period of heavy rain increased the rainfall total for this storm from about 4.5 in. late in the day on June 27 to more than 7.5 in. by noon on June 28 at the NWS station at Claryville, NY.

Precipitation data for the NWS station at Binghamton, NY, indicate slightly different timing, but a similar rainfall pattern (fig. 2B). Recorded rainfall at Binghamton indicated a rather sharp increase in rainfall from near midnight on June 26 into the early morning hours of June 27, then a fairly slow and intermittent rain until early evening on June 27. A heavy and fairly constant period of rain was recorded from early evening on June 27 through the morning of June 28. Rainfall totals at Binghamton increased from less than 4 in. to more than 6.5 in. from June 27 to the morning of June 28.

The New York City Department of Environmental Protection (NYCDEP) recording station at the Cannonsville Reservoir recorded just over 4.4 in. of rainfall from June 26 to 29 and a total of almost 6 in. for the period of June 23–29 (fig. 2C). Additional NWS and NYCDEP precipitation stations recorded storm totals of greater than 13 in. at Walton and Fishs Eddy, NY; greater than 10 in. near Ashland, NY; greater than 7 in. at Sherburne, NY; and greater than 3.5 in. at Lansing Manor and Albany, NY (fig. 2D). Total rainfall amounts at 55 selected locations in New York are listed in table 1.

Daily rainfall totals for June 27 exceeded 5 in. at Platte Clove, 4.6 in. at East Jewett, and 4 in. at Binghamton and Delta Dam, NY (figs. 1A, 1B). On June 28 daily rainfall totals exceeded 5 in. at Rockdale, NY. Rainfall frequencies for these daily totals were estimated to have a recurrence interval of about 10 years at Platte Clove, between 5 and 10 years at Binghamton and East Jewett, from 10 to 25 years at Delta Dam, and about 50 years at Rockdale (U.S. Weather Bureau, 1961). On June 28, the largest 1-day rainfall totals in the State of New York for this storm were recorded at Walton and Fishs Eddy, NY. The NWS reported rainfall totals of 9.63 and 8.34 in. on June 28 at Walton and Fishs Eddy (National Oceanic and Atmospheric Administration, 2006b) (fig. 1B). The rainfall frequencies for these two stations exceeded the 24-hour 100-year recurrence interval (U.S. Weather Bureau, 1961). The 4-day rainfall total at Binghamton is between the 4-day 50-year and the 4-day 100-year recurrence intervals, but the 4-day rainfall totals of greater than 13 in. for Fishs Eddy and Walton exceeded the 4-day 100-year recurrence interval (U.S. Weather Bureau, 1964). Heavy rain from June 26 to June 29, 2006, produced period-of-record flooding that superseded the previous records set by the 1936, 1955, 1972,

and the 1996 storms at the Mohawk River at Little Falls, the West Branch Delaware River at Walton, and the Susquehanna River at Conklin stream-gaging stations. Rainfall frequencies for selected sites are listed in tables 2A and 2B.

Prolonged rainfall events in previous years also resulted in record-setting floods in New York and the surrounding region. Extended precipitation patterns in March 1936 produced record flooding in the Hudson, Delaware, and Susquehanna River basins. The floods of March 1936 were caused by precipitation during March 9–22, a period of warming temperatures, when much of the topography was snow covered and rivers were still ice covered. This event was categorized as one long precipitation event having two periods of concentrated heavy rain. Rain and snow during March 9–10 were followed by heavier rains during March 11–13. Precipitation amounts from the first half of this storm event were generally in the 2-in. range across the Delaware and Susquehanna River basins. Heavy precipitation from the second half of this storm event began around March 16 and continued through March 19, producing an additional 2 to as much as 6 in. of precipitation in the Delaware and Susquehanna River basins by March 22. The precipitation from this extended event caused record-breaking or extraordinary flooding in the Hudson, Delaware, and Susquehanna River basins. Records set in March 1936 at several USGS stream-gaging stations along the Susquehanna River remained until they were superseded by the June 2006 flood. Total rainfall amounts for the March 9–22, 1936, precipitation event are presented in figure 3A.

The floods from Hurricanes Connie and Diane in August 1955 were also produced by two back-to-back precipitation events. Heavy rains from Hurricane Connie produced rainfall totals of 3 to more than 7 in. during August 11–14, 1955. Hurricane Diane added an additional 2 to 9 in. of rain in southeastern New York during August 17–20, 1955. Period-of-record maximums were set at several USGS stream-gaging stations along the main stem of the Delaware River from near Barryville, NY, downstream to Trenton, NJ.

The floods resulting from Hurricane Agnes was produced by an extended period of precipitation during June 19–23, 1972 (fig. 3B). This storm produced rainfall totals of 3 to greater than 12 in. in many locations in southern New York. The heaviest rainfall in New York fell over parts of the Allegheny and Susquehanna River basins. Although at the time widespread flooding was recorded at many stations in southern New York, major flooding at the headwaters of the Susquehanna River upstream from Vestal, NY, did not occur as a result of this storm. Flooding in the Chemung River basin and downstream from the confluence of the Chemung and Susquehanna Rivers near the New York and Pennsylvania border to the Chesapeake Bay was considered to be the greatest flood known since 1784 (Bailey and others, 1975).


0

1

2

3

4

5

6

7

8

0:006/25/2006

0:006/26/2006

0:006/27/2006

0:006/28/2006

0:006/29/2006

DATE AND TIME

CUM

ULAT

IVE

RAIN

FALL

, IN

INCH

ES

0

1

2

3

4

5

6

7

8

9

DATE AND TIME

CUM

ULAT

IVE

RAIN

FALL

, IN

INCH

ES

12:00 12:00 12:00 12:00

0:006/25/2006

0:006/26/2006

0:006/27/2006

0:006/28/2006

0:006/29/2006

12:00 12:00 12:00 12:00

Figure 2A. Cumulative hourly rainfall during June 25–28, 2006, recorded at the National Weather Service hourly recording station at Claryville, NY. (Location shown in figs. 1D.)

Figure 2B. Cumulative hourly rainfall during June 25–28, 2006, recorded at the National Weather Service office at Binghamton, NY. (Location shown in figs. 1E.)


0

1

2

3

4

5

6

7

6/23/20060:00

6/24/20060:00

6/25/20060:00

6/26/20060:00

6/27/20060:00

6/28/20060:00

6/29/20060:00

DATE AND TIME

CUM

ULAT

IVE

RAIN

FALL

, IN

INCH

ES

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

0:006/25/2006

DATE AND TIME

CUM

ULAT

IVE

RAIN

FALL

, IN

INCH

ES

12:00 12:0012:0012:0012:0012:00

0:006/29/2006

0:006/28/2006

0:006/27/2006

0:006/26/2006

12:00 12:0012:0012:00

Figure 2C. Cumulative hourly rainfall during June 23–28, 2006, recorded at the New York City Department of Environmental Protection station at Cannonsville Reservoir, NY. (Location shown in figs. 1D.)

Figure 2D. Cumulative hourly rainfall during June 25–28, 2006, recorded at Albany International Airport, NY. (Location shown in figs. 1B, 1C.)

Storm of June 26–29, 2006 11

Table 1. Total rainfall for the storm of June 26–29, 2006, at selected locations in New York and surrounding areas. —Continued

[Data provided by National Oceanic and Atmospheric Administration (2006a) and New York City Department of Environmental Protection (written commun. 2007); selected data shown in fig. 1C–E]

Site number Site nameTotal rainfall

(inches)

1 WDCL Radio Tower, PA 14.642 Aldenville, PA 13.673 Walton, NY 13.364 Fishs Eddy, NY 13.285 Platte Clove, NY 11.786 Equinunk, PA 11.687 Pleasant Mount, PA 10.588 Frost Valley, NY 9.579 Moscow, PA 9.1610 Montrose, PA 8.3411 East Jewett, NY 8.3012 Slide Mountain, NY 8.1113 Delhi, NY 8.1014 Noxen, PA 8.1015 Cooperstown, NY 7.9916 Claryville, NY 7.7917 Chichester NY 7.5818 Rockdale, NY 7.5319 Susquehanna, PA 7.4620 Grahamsville, NY 7.2321 Binghampton WSO, NY 7.1322 Maryland 6 SW, NY 6.8723 Delta Dam, NY 6.7424 Rondout Reservoir, NY 6.2925 Ellenville, NY 6.2826 Orwell, PA 6.0427 Dingman, PA 5.8528 New London Lock 22, NY 5.7829 North Creek, NY 5.7230 Rhinebeck, NY 5.4531 Cannonsville Reservoir, NY 5.4332 Gloversville, NY 5.3733 Ashokan Reservoir, NY 5.3034 Tully Hebring Forest, NY 5.2735 Alcove Dam, NY 5.0836 Glens Falls Farm, NY 4.5837 Spencer, NY 4.4538 Windham, NY 4.3739 Northville, NY 4.3740 Gardnerville, NY 4.29


Flood of June 27–29, 2006, Discharge and Frequency

The location of the three major basins studied in this report and selected USGS stream-gaging stations are presented in figure 4. Historic flood peaks and peak discharges during the June 2006 flood at 76 USGS stream-gaging stations are presented in table 3.

Frequency analysis of annual flood-peak data recorded at stream-gaging stations provides a means of estimating the probability of occurrence of a given discharge. Flood frequency is commonly expressed in terms of recurrence interval or the probability of being exceeded (one is the reciprocal of the other). The 100-year flood, for example, has a probability of 0.01 (1-percent chance) of being equaled or exceeded in any given year.

Recurrence intervals for stream-gaging stations listed in this report were calculated by fitting annual peak-discharge data to a log-Pearson type III distribution (Interagency Advisory Committee on Water Data, 1982). The results of this analysis were weighted with the results of the regional flood-frequency analysis (Lumia, 2006) at stream-gaging stations with unregulated streamflows. Recurrence intervals at stream-gaging stations with substantial regulation were calculated from statistical analyses of annual peak discharges during the regulated period only, except along the main stem of the Delaware River from Callicoon, NY, to Montague, NJ. No adjustments were made for the amount of available storage

in the reservoirs before or during floods, or for changes in regulation procedures during the period of regulation. Recurrence intervals at stream-gaging stations along the main stem of the Delaware River from Callicoon, NY, to Montague, NJ, were computed by fitting systematic annual peak-discharge data to a log-Pearson type III distribution for the entire period of record (Schopp and Firda, 2008).

Peak discharges recorded during the June 2006 flood at several of the USGS stream-gaging stations listed in table 3 had recurrence intervals of less than 25 years. Stream-gaging stations at the Hudson River at Hadley (01318500), and Esopus Creek at Coldbrook (01362500) in the Hudson River basin; the East and West Branches of the Neversink River near Claryville (01434107 and 01434498) in the Delaware River basin; and the Tioughnioga River at Cortland (01509000)in the Susquehanna River basin all recorded peak discharges with recurrence intervals of less than 25 years. Substantial flooding and peak discharges with a greater than 100-year recurrence interval were recorded at several stations along the Mohawk, Delaware, and Susquehanna Rivers and on some of their major tributaries. Although widespread flooding did occur throughout the region, the increase in magnitude and frequency of peak discharges at several stream-gaging stations along the main branches of these rivers can be linked to major inflows from larger tributaries. (Details about peak discharges and flood frequency as a result of the June 2006 flood are discussed in the following sections.) Antecedent conditions, precipitation and runoff patterns, and basin characteristics all play a role in determining the peak

Table 1. Total rainfall for the storm of June 26–29, 2006, at selected locations in New York and surrounding areas. —Continued

[Data provided by National Oceanic and Atmospheric Administration (2006a) and New York City Department of Environmental Protection (written commun. 2007); selected data shown in fig. 1C–E]

Site number Site nameTotal rainfall

(inches)

41 Whitehall, NY 3.9842 Lansing Manor, NY 3.9643 Chemung, NY 3.8644 Schoharie Reservoir, NY 3.7245 Newcomb, NY 3.646 Albany INTL AP, NY 3.6247 Monroeton, PA 3.2648 Poughkeepsie, NY 3.1049 Delanson 2Ne, NY 3.0450 Cobleskill, NY 3.0051 Tribes Hill, NY 2.9852 West Point, NY 2.9753 Carmel, NY 2.4254 East Chatham, NY 2.1955 Yorktown Heights, NY 1.33

Flood of June 27–29, 2006, Discharge and Frequency 13

Table 2A. Rainfall-frequency relations for storms of 3-, 6-, 12-, and 24-hour duration at selected locations in New York.

[Data from U.S. Weather Bureau, 1961. Locations are shown in fig. 1C–E]

Site number

Site name

CountyRecurrence

intervalRainfall, in inches for selected duration

(years) 3 hours 6 hours 12 hours 24 hours

3 Walton Delaware 2 1.7 2.0 2.4 2.85 2.2 2.6 3.2 3.6

10 2.4 2.9 3.7 4.525 2.9 3.6 4.3 5.050 3.2 3.9 4.8 5.8

100 3.4 4.5 5.3 6.8

4 Fishs Eddy Delaware 2 1.7 2.1 2.6 2.95 2.3 2.7 3.4 3.8

10 2.5 3.1 3.9 4.725 3.0 3.8 4.8 5.250 3.4 4.1 5.0 5.9

100 3.6 4.7 5.8 6.9

16 Claryville Sullivan 2 1.9 2.5 3.3 3.55 2.5 3.0 4.0 4.6

10 2.9 3.9 4.6 5.825 3.4 4.3 5.5 6.550 3.9 5.0 6.0 7.0

100 4.1 5.5 6.8 8.0

21 Binghamton Broome 2 1.4 1.8 2.4 2.85 2.0 2.5 3.0 3.5

10 2.3 2.9 3.5 4.125 2.5 3.4 4.0 4.850 2.8 3.8 4.3 5.2

100 3.3 4.1 5.0 5.8

28 Delta Dam Oneida 2 1.6 1.9 2.3 2.55 1.9 2.3 2.8 3.3

10 2.4 2.8 3.3 3.725 2.8 3.0 3.6 4.450 3.0 3.5 3.8 4.7

100 3.4 3.8 4.5 4.9


75°76°

43°

42°


15

0 30 KILOMETERS15

30 MILES0

Less than or equal to 2

2.01 – 4

4.01 – 6

6.01 – 8

8.01 – 10

10.01 – 12

Greater than 12

EXPLANATIONArea of equalrainfall, in inches

Drainage-basinboundary

PortJervis

NEW JERSEY

PENNSYLVANIA

NEW YORK

Delaware River basin

Mohawk River basin


Walton

Rockdale

Binghamton

Ithaca

Cortland

SyracuseUtica

FishsEddy

Figure 3A. Total precipitation in the Susquehanna River basin and surrounding area for the storms of March 9–22, 1936.

Table 2B. Rainfall-frequency relations for storms of 4-day duration at selected locations in New York.

[Data from U.S. Weather Bureau, 1964. Locations are shown in fig. 1C–E]

Site number Site name County

Rainfall, in inches for 4-day duration for selected recurrence intervals ( years)

2 5 10 25 50 100

3 Walton Delaware 4.1 5.0 5.9 7.0 7.8 8.84 Fishs Eddy Delaware 4.4 5.3 6.0 7.4 8.0 9.0

16 Claryville Sullivan 5.4 7.0 8.1 10.0 10.0 12.021 Binghamton Broome 3.9 4.8 5.5 6.4 6.9 7.828 Delta Dam Oneida 3.6 4.3 4.8 5.7 6.2 6.8


discharge at a stream-gaging station. Peak discharges for selected stream-gaging stations in the Hudson (contains the Mohawk River basin), Delaware, and Susquehanna River basins are plotted as a function of drainage area in figure 5. The spatial distribution of peak discharge frequencies for selected USGS stream-gaging stations is presented in figure 6. Annual peak discharges for the period of record through 2006, the recomputed 10-, 50-, and 100-year recurrence intervals, and a 10-year weighted moving average of annual peak discharges at 25 selected stream-gaging stations are presented in figure 7. The weighted moving average of annual peak discharges is presented in figure 7 to show the general trend or pattern of yearly maximum flows (Helsel and Hirsch, 1992). The trend lines (weighted moving average) in figure 7 generally show the dryer periods of the 1960s and 1970s and the wetter periods of the 1980s, 1990s, and 2000s. At some of

the stream-gaging stations immediately downstream from a reservoir, a reduction in the peak discharge is identifiable after the reservoirs began storage operations.

Mohawk River Basin

USGS stream-gaging stations along the Mohawk River near Rome (01336000) and Little Falls (01347000) recorded peak discharges on the morning of June 28, 2006 (fig. 8A–1). USGS stream-gaging stations on the East and West Canada Creeks, major tributaries to the Mohawk River, also recorded peak discharges on the morning of June 28, 2006. Farther downstream near the mouth of the Mohawk River at Cohoes (01357500) , the peak discharge was recorded in the morning hours of June 29, 2006 (fig. 8A–1).

Mohawk River basin


DelawareRiverbasinAllegheny River basin

44°

42°

74°76°78°80°

0 60 MILES

0 60 KILOMETERS

30

30

EXPLANATION

Line of equal precipitation, in inches

Drainage-basin boundary

3

Modified from J.F. Bailey and others (1975)

Figure 3B. Total rainfall in New York and surrounding area for the storm of June 19–23, 1972.


Rome

Utica

Poland

Cohoes

Albany

Oneonta

Newport

Herkimer

Schoharie

AmsterdamFort Plain

Dolgeville

TribesHill

Middleville

Fultonville

Canajoharie

Little Falls

Emmonsburg

Gilboa

Jacksonburg

73°45'75°

43°45'

42°30'

HinckleyReservoirDelta

Reservoir

East

Can

ada

Cre

ek

West Canada Creek

C obleskill Creek

Schoharie Creek

Mohawk

River

NEW YORK

PENNSYLVANIABase from U.S. Geological Survey digital data, 1:100,000, 1983Universal Transverse Mercator Projection, Zone 18,North American Datum (NAD) 1983

365

8

169

1030A 30

28

51

90

90

HamiltonLewis

Oneida

Delaware

Herkimer

Otsego

Warren

Ulster

Greene

Saratoga

Fulton

Albany

SchoharieChenango

Madison

Sullivan

BroomeDutchess

Columbia

Montgomery

Schenectady

Was

hing

ton

04243500

01358000

0135750001351500

01350000

01349150

01348000

01347000

01346000

01336000

01321000 0131850001343060

15

0 30 KILOMETERS15

30 MILES0

01349150


Road and number

U.S. Geological Suvey stream-gagingstation and number

Town or city

51

Figure 4A. Locations of selected U.S. Geological Survey stream-gaging stations in the Mohawk River basin, NY, and surrounding area. (Station names and flood-related data listed in table 3.)


Cannonsville ReservoirPepacton Reservoir

NeversinkReservoir

SchoharieReservoir

Lake

LakeWallenpaupack

PromptonReservoir

Middle Creek

Mongaup River

Delaware River

Neversink Ri ver

Hal

fway

Bro

ok

Dyberry C

reek


axen River

Wal

lenp

aupa

ck C

r.

Shoh

ola C

r.


206

2830

97

52

17

97

30

55 42

17B

17

590

652

191

§

Hazel

Delhi

Roscoe

Horton

HamdenWalton

Sidney

Hancock

Deposit

MorsstonNeversink

Beerston

PondEddy

Barryville

Wilsonville

Peakville

Lordville

Cochecton

Narrowsburg

Hortonville

Falls Mills

Montague

Sparrow Bush

MinisinkFord

Prompton Honesdale

Margaretville

Skinners Falls

ButternutGrove

CallicoonCenter

Livingston Manor

RocklandFishsEddy

DownsvilleStilesville

PortJervis

Hale Eddy

Callicoon

East Branch

E. Bra nc

h C

allico

on Cr.

01438500

01437500

01436690

01436000

01435000

01434498

01434025 01434021

01434017

01434000

01432900

01428500

01427510

01426500

01425000

0142300001422747

01422738

0142400103

01422500 01422389

01421900

0142161801421614

01421610

01421000

01420500

01417500

01417000

0141500001414500

01414000 01413500

01431500

Delaware

Pike

Wayne Sullivan

Ulster

Orange

Chenango

Sussex

Otsego

Lackawanna

Broome

Susquehanna

Monroe

Schoharie

Greene

LuzernePassaic

PENNSYLVANIA

NEW JERSEY

NEW YORK

75°42°30'

41°15'


East Branch

Delaware River

West Branch Delaware Rive

r

10

0 20 KILOMETERS10

20 MILES0

L ackawaxen R iver

Beaver KillN.

Bra

nch Callic

oon C

r.

Willowem o c Cr

eek

LittleBeaverKill

01426500


Road and number


Town or city

97

Figure 4B. Locations of selected U.S. Geological Survey stream-gaging stations in the Delaware River basin, NY, and surrounding area. (Station names and flood-related data listed in table 3.)


Whitney Point Lake East Sidney

Lake

Otselic

River

Tioughnioga River

Chenango River

Ouleout C r.

Susquehanna R i v e r

Unadi

lla R

iver

Owego

Otego

Afton

Athens

Oxford

Greene

Windsor

Oneonta

Norwich

Milford

Earlville

Nineveh

Pittsfield

Great Bend

SusquehannaDepot

Cooperstown

ConklinNichols

Unadilla

Dickinson

Butternuts

Binghamton

Bainbridge

JohnsonCity

01531000

01531500

Chemung R.

Waverly

8

96B

206

8

205

12

17

23

23

206

20

28

79

13

13

23

267

220

12B

88

04234000

01515000

01514801 01514000

01513831

01513500

01512500

01511500

0151061001510000

01509520

01509000

01507000

01505000

01503980

04243500

0150300001502731

01502632

01502500

0150050001500000

01497805

75°76°10'

43°

41°50'


15

0 30 KILOMETERS15

30 MILES0

PENNSYLVANIA

NEW JERSEY

NEW YORK

Oneida

Delaware

Otsego

Wayne Sullivan

Oswego

Tioga Broome

Herkimer

Cayuga

Chenango

Pike

Bradford

Madison

Onondaga

Susquehanna

Cortland

Tompkins

Wyoming

Sullivan

Hamilton

Fulton

Luzerne

Orange

Ulster

Lewis

Lackawanna

Scho

harie

Montgomery

Sussex

Seneca

Greene

Lycoming

Schu

yler

Chem

ung

01500500


Road and number


Town or city

23

Figure 4C. Locations of selected U.S. Geological Survey stream-gaging stations in the Susquehanna River basin, NY, and surrounding area. (Station names and flood-related data listed in table 3.)

Flood of June 27–29, 2006, Discharge and Frequency 19Ta

ble

3.

Perio

d-of

-rec

ord

peak

dis

char

ges

and

peak

dis

char

ges

durin

g th

e flo

od o

f Jun

e 26

–29,

200

6, a

t sel

ecte

d U.

S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

New

Yor

k an

d su

rrou

ndin

g ar

eas.

[mi2 ,

squa

re m

iles;

ft, f

eet;

ft3 /s, c

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feet

per

seco

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urs;

ft3 /s

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et p

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per

squa

re m

ile; <

, les

s tha

n; >

, gre

ater

than

; -- ,

no

data

ava

ilabl

e]

Stat

ion

num

ber

Stat

ion

nam

e

Peri

od-o

f-re

cord

pea

k di

scha

rge

June

26-

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k di

scha

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Dra

in-

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area

(m

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Peri

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f re

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Dat

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Dat

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Dis

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Recu

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inte

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(y

ears

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Huds

on R

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Hud

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ley,

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1,66

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19

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321

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Saca

ndag

a R

iver

nea

r Hop

e, N

Y49

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9.96

26,6

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0133

6000

Moh

awk

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er b

elow

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ta D

am, n

ear R

ome,

N

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152

1927

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610

/02/

4511

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100

20.4

4

0134

3060

Wes

t Can

ada

Cre

ek n

ear W

ilmur

t, N

Y25

8

20

01-2

006

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215

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13.6

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--

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6000

Wes

t Can

ada

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ek a

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t Brid

ge, N

Y*

560

1913

, 20

-200

610

/02/

458.

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0038

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0001

3470

00M

ohaw

k R

iver

nea

r Litt

le F

alls

, NY

*1,

342

1927

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603

/14/

7719

.17

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00 &

<50

001

3480

00Ea

st C

anad

a C

reek

at E

ast C

reek

, NY

289

1945

-96,

98

, 00,

03

-200

6

10/0

2/45

9.00

24,0

0006

/28/

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4510

.99

31,5

0010

9.0

>500

0134

9150

Can

ajoh

arie

Cre

ek n

ear C

anaj

ohar

ie, N

Y59

.7

1993

-200

611

/09/

968.

883,

630

06/2

8/06

0945

10.5

05,

510

92.3

30

0135

0000

Scho

harie

Cre

ek a

t Pra

ttsvi

lle, N

Y23

7

19

02-2

006

01/1

9/96

19.3

952

,800

06/2

6/06

1815

12.7

019

,100

80.6

3

0135

1500

Scho

harie

Cre

ek a

t Bur

tons

ville

, NY

*88

6

19

39-2

006

01/2

0/96

12.8

881

,600

06/2

8/06

2330

6.97

28,1

0031

.74

0135

7500

Moh

awk

Riv

er a

t Coh

oes,

NY

*3,

450

1917

-200

603

/06/

6423

.15

143,

000

06/2

9/06

0945

20.7

096

,400

27.9

15

0135

8000

Hud

son

Riv

er a

t Gre

en Is

land

, NY

*8,

090

1946

-200

612

/31/

4827

.05

181,

000

06/2

9/06

1000

23.6

712

3,00

015

.25

0136

2500

Esop

us C

reek

at C

oldb

rook

, NY

**19

2

19

31-2

006

03/2

1/80

21.9

465

,300

06/2

8/06

0930

15.5

225

,900

134.

95

0137

1500

Wal

lkill

Riv

er a

t Gar

dine

r, N

Y**

695

1924

-200

610

/16/

5519

.81

30,8

0006

/28/

0618

309.

4810

,500

15.1

2

Pass

aic

Rive

r bas

in

0138

7420

Ram

apo

Riv

er a

t Suf

fern

, NY

**93

.0

1979

-200

604

/05/

8415

.38

12,3

0006

/28/

0609

155.

1894

210

.1<2

Dela

war

e Ri

ver b

asin

0141

3500

East

Bra

nch

Del

awar

e R

iver

at M

arga

retv

ille,

NY

163

1937

-200

601

/19/

9614

.88

25,8

0006

/28/

0610

1512

.60

13,6

0083

.49

0141

4000

Plat

te K

ill a

t Dun

rave

n, N

Y34

.9

1941

-62,

96

-200

601

/19/

969.

605,

690

06/2

8/06

0545

6.88

b 2,2

0063

.04

20 Flood of June 26–29, 2006, Mohawk, Delaware, and Susquehanna River Basins, New YorkTa

ble

3.

Perio

d-of

-rec

ord

peak

dis

char

ges

and

peak

dis

char

ges

durin

g th

e flo

od o

f Jun

e 26

–29,

200

6, a

t sel

ecte

d U.

S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

New

Yor

k an

d su

rrou

ndin

g ar

eas.

[mi2 ,

squa

re m

iles;

ft, f

eet;

ft3 /s, c

ubic

feet

per

seco

nd; h

r, ho

urs;

ft3 /s

/mi2 ,

cubi

c fe

et p

er se

cond

per

squa

re m

ile; <

, les

s tha

n; >

, gre

ater

than

; -- ,

no

data

ava

ilabl

e]

Stat

ion

num

ber

Stat

ion

nam

e

Peri

od-o

f-re

cord

pea

k di

scha

rge

June

26-

29, 2

006,

pea

k di

scha

rge

Dra

in-

age

area

(m

i2 )

Peri

od o

f re

cord

Dat

e St

age

(ft

)

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arge

(ft

3 /s)

Dat

e Ti

me

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r)St

age

(ft

)

Dis

-ch

arge

(ft

3 /s)

Dis

-ch

arge

[(f

t3 /s)/

mi2 ]

Recu

rren

ce

inte

rval

(y

ears

)

Dela

war

e Ri

ver b

asin

—Co

ntin

ued

0141

4500

Mill

Bro

ok n

ear D

unra

ven,

NY

25.2

19

37-2

006

01/1

9/96

12.5

65,

380

06/2

8/06

0445

9.01

2,15

085

.34

0141

5000

Trem

per K

ill n

ear A

ndes

, NY

33.2

19

37-2

006

01/1

9/96

7.69

5,00

006

/28/

0607

006.

422,

970

89.5

10

0141

7000

East

Bra

nch

Del

awar

e R

iver

at D

owns

ville

, NY

*37

2

19

41-5

4,

55-2

006

11/2

6/50

a 14.

5223

,900

06/2

8/06

1330

12.0

420

,000

53.8

50

0141

7500

East

Bra

nch

Del

awar

e R

iver

at H

arva

rd, N

Y*

458

1934

-54,

55

-67,

77

-200

6

09/2

2/38

a 16.

9331

,400

06/2

8/06

1645

16.6

122

,100

48.3

45

0142

0500

Bea

ver K

ill a

t Coo

ks F

alls

, NY

241

1913

-200

604

/03/

0518

.98

50,8

0006

/28/

06--

20

.55

62,4

0025

8.9

>100

&

<500

0142

1000

East

Bra

nch

Del

awar

e R

iver

at F

ishs

Edd

y, N

Y*

784

1912

-54,

55

-200

604

/03/

0519

.47

65,1

0006

/28/

0610

4521

.43

77,4

0098

.7>1

00 &

<5

0001

4216

10W

est B

ranc

h D

elaw

are

Riv

er a

t Hob

art,

NY

15.5

20

00-2

006

09/1

8/04

2.84

738

06/2

8/06

0715

2.69

646

41.7

--

0142

1614

Tow

n B

rook

Trib

utar

y so

uthe

ast o

f Hob

art,

NY

0.76

1998

-200

607

/04/

993.

2426

806

/28/

0604

153.

0217

923

5.5

--

0142

1618

Tow

n B

rook

sout

heas

t of H

obar

t, N

Y14

.3

1997

-200

607

/04/

997.

544,

400

06/2

8/06

0445

6.35

2,49

017

4.1

--

0142

1900

Wes

t Bra

nch

Del

awar

e R

iver

ups

tream

from

D

elhi

, NY

134

1937

-70,

72

-74,

96

-200

6

01/1

9/96

a 9.8

0b

13,0

0006

/28/

0606

3011

.89

8,06

060

.120

0142

2389

Cou

lter B

rook

nea

r Bov

ina

Cen

ter,

NY

0.76

1997

-200

604

/02/

051.

9354

06/2

8/06

--

2.42

b 95

125.

0--

0142

2500

Littl

e D

elaw

are

Riv

er n

ear D

elhi

, NY

49.8

19

37-7

0,

72-7

4, 9

6-20

06

01/1

9/96

8.51

6,10

006

/28/

0608

006.

973,

100

62.2

6

0142

2738

Wol

f Cre

ek a

t Mun

dale

, NY

0.61

1998

-200

604

/02/

052.

9071

06/2

8/06

0215

4.29

350

573.

8--

0142

2747

East

Bro

ok e

ast o

f Wal

ton,

NY

24.7

19

98-2

006

09/1

8/04

6.71

2,83

006

/28/

0603

159.

957,

110

287.

9--

0142

3000

Wes

t Bra

nch

Del

awar

e R

iver

at W

alto

n, N

Y33

2

19

50-2

006

01/1

9/96

16.3

625

,000

06/2

8/06

0330

16.8

528

,600

86.1

>100

&

<500

0142

4001

03Tr

out C

reek

nea

r Tro

ut C

reek

, NY

20.2

19

52-6

7,

96-2

006

01/1

9/96

7.24

2,80

006

/27/

0613

456.

994,

350

215.

3>1

00 &

<5

00


ble

3.

Perio

d-of

-rec

ord

peak

dis

char

ges

and

peak

dis

char

ges

durin

g th

e flo

od o

f Jun

e 26

–29,

200

6, a

t sel

ecte

d U.

S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

New

Yor

k an

d su

rrou

ndin

g ar

eas.

[mi2 ,

squa

re m

iles;

ft, f

eet;

ft3 /s, c

ubic

feet

per

seco

nd; h

r, ho

urs;

ft3 /s

/mi2 ,

cubi

c fe

et p

er se

cond

per

squa

re m

ile; <

, les

s tha

n; >

, gre

ater

than

; -- ,

no

data

ava

ilabl

e]

Stat

ion

num

ber

Stat

ion

nam

e

Peri

od-o

f-re

cord

pea

k di

scha

rge

June

26-

29, 2

006,

pea

k di

scha

rge

Dra

in-

age

area

(m

i2 )

Peri

od o

f re

cord

Dat

e St

age

(ft

)

Dis

-ch

arge

(ft

3 /s)

Dat

e Ti

me

(h

r)St

age

(ft

)

Dis

-ch

arge

(ft

3 /s)

Dis

-ch

arge

[(f

t3 /s)/

mi2 ]

Recu

rren

ce

inte

rval

(y

ears

)

Dela

war

e Ri

ver b

asin

—Co

ntin

ued

0142

5000

Wes

t Bra

nch

Del

awar

e R

iver

at S

tiles

ville

, NY

*45

6

19

52-6

3,

64-2

006

01/2

2/59

a 9.0

117

,500

06/2

8/06

1200

17.7

233

,100

72.6

>100

&

<500

0142

6500

Wes

t Bra

nch

Del

awar

e R

iver

at H

ale

Eddy

, NY

*59

5

19

12-6

3,

64-2

006

03/2

2/48

15.6

928

,900

06/2

8/06

1300

19.1

043

,400

72.9

>100

&

<500

0142

7510

Del

awar

e R

iver

at C

allic

oon,

NY

***

1,82

0

19

75-2

006

04/0

3/05

17.9

811

4,00

006

/28/

0617

1520

.38

144,

000

79.1

>100

&

<500

0142

8500

Del

awar

e R

iver

abo

ve L

acka

wax

en R

iver

nea

r B

arry

ville

, NY

***

2,02

0

19

40-2

006

08/1

9/55

26.4

013

0,00

006

/28/

06--

28

.97

151,

000

74.8

>100

&

<500

0143

1500

Lack

awax

en R

iver

at H

awle

y, P

A*

290

1908

-17,

38

-60,

61

-200

6

08/1

9/55

24.8

051

,900

06/2

8/06

1430

18.1

928

,000

96.6

c >10

0 &

<5

00

0143

2900

Mon

gaup

Riv

er a

t Mon

gaup

Val

ley,

NY

76.6

20

02-2

006

04/0

3/05

13.4

77,

630

06/2

8/06

1130

10.6

54,

730

61.7

--

0143

4000

Del

awar

e R

iver

at P

ort J

ervi

s, N

Y**

*3,

070

1904

-200

608

/19/

5523

.91

233,

000

06/2

8/06

1815

21.4

718

9,00

061

.680

0143

4006

80Ea

st B

ranc

h N

ever

sink

Riv

er n

orth

east

of

Den

ning

, NY

8.93

1990

-200

609

/16/

996.

963,

070

06/2

8/06

0800

5.82

1,76

019

7.1

3

0143

4017

East

Bra

nch

Nev

ersi

nk R

iver

nea

r Cla

ryvi

lle, N

Y22

.9

1991

-200

604

/02/

0512

.33

4,59

006

/28/

0607

4511

.25

3,45

015

0.7

5

0143

4021

Wes

t Bra

nch

Nev

ersi

nk R

iver

at W

inni

sook

Lak

e ne

ar F

rost

Val

ley,

NY

0.77

1991

-200

604

/02/

053.

3721

806

/28/

0607

002.

8117

022

0.8

6

0143

4025

Bis

cuit

Bro

ok a

bove

Pig

eon

Bro

ok a

t Fro

st

Valle

y, N

Y3.

7219

83-2

006

04/0

4/87

4.37

815

06/2

8/06

0900

3.24

266

71.5

<2

0143

4498

Wes

t Bra

nch

Nev

ersi

nk R

iver

at C

lary

ville

, NY

33.8

19

91-2

006

04/0

2/05

12.7

39,

570

06/2

8/06

0730

12.1

58,

310

245.

915

0143

5000

Nev

ersi

nk R

iver

nea

r Cla

ryvi

lle, N

Y66

.6

1937

-200

611

/25/

5015

.00

23,4

0006

/28/

0609

0012

.79

11,5

0017

2.7

8

0143

6000

Nev

ersi

nk R

iver

at N

ever

sink

, NY

*92

.6

1941

-53,

54

-200

611

/25/

50a 1

1.23

22,3

0006

/28/

0611

159.

487,

840

84.7

26

0143

6690

Nev

ersi

nk R

iver

at B

ridge

ville

, NY

*17

1

19

92-2

006

04/0

3/05

21.2

525

,900

06/2

8/06

1630

16.1

612

,500

73.1

25

0143

7500

Nev

ersi

nk R

iver

at G

odef

froy

, NY

*30

7

19

37-5

3,

54-2

006

08/1

9/55

12.4

933

,000

06/2

8/06

--

11.0

816

,600

54.1

7

0143

8500

Del

awar

e R

iver

at M

onta

gue,

NJ*

**3,

480

1939

-200

608

/09/

5535

.15

250,

000

06/2

8/06

2215

32.1

521

2,00

060

.980


ble

3.

Perio

d-of

-rec

ord

peak

dis

char

ges

and

peak

dis

char

ges

durin

g th

e flo

od o

f Jun

e 26

–29,

200

6, a

t sel

ecte

d U.

S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

New

Yor

k an

d su

rrou

ndin

g ar

eas.

[mi2 ,

squa

re m

iles;

ft, f

eet;

ft3 /s, c

ubic

feet

per

seco

nd; h

r, ho

urs;

ft3 /s

/mi2 ,

cubi

c fe

et p

er se

cond

per

squa

re m

ile; <

, les

s tha

n; >

, gre

ater

than

; -- ,

no

data

ava

ilabl

e]

Stat

ion

num

ber

Stat

ion

nam

e

Peri

od-o

f-re

cord

pea

k di

scha

rge

June

26-

29, 2

006,

pea

k di

scha

rge

Dra

in-

age

area

(m

i2 )

Peri

od o

f re

cord

Dat

e St

age

(ft

)

Dis

-ch

arge

(ft

3 /s)

Dat

e Ti

me

(h

r)St

age

(ft

)

Dis

-ch

arge

(ft

3 /s)

Dis

-ch

arge

[(f

t3 /s)/

mi2 ]

Recu

rren

ce

inte

rval

(y

ears

)

Susq

ueha

nna

Rive

r bas

in

0149

7805

Littl

e El

k C

reek

nea

r Wes

tford

, NY

3.73

1978

-200

601

/19/

9619

.92

278

06/2

8/06

--

19.8

928

877

.225

0150

0000

Oul

eout

Cre

ek a

t Eas

t Sid

ney,

NY

*10

3

19

40-4

9,

50-2

006

12/3

0/42

a 7.

627,

250

07/0

1/06

2330

4.69

2,01

019

.54

0150

0500

Susq

ueha

nna

Riv

er a

t Una

dilla

, NY

982

1935

-36,

38

-200

603

/18/

3616

.60

b 31

,300

06/2

9/06

0415

17.7

235

,100

35.7

>100

&

<500

0150

2500

Una

dilla

Riv

er a

t Roc

kdal

e, N

Y52

0

19

30-3

3,

37-2

006

12/3

1/42

12.9

817

,400

06/2

8/06

2300

13.9

623

,100

44.4

>100

&

<500

0150

2632

Susq

ueha

nna

Riv

er a

t Bai

nbrid

ge, N

Y1,

610

1989

-200

604

/03/

0520

.47

37,5

0006

/29/

0609

3027

.05

58,7

0036

.5>1

00 &

<5

0001

5027

31Su

sque

hann

a R

iver

at W

inds

or, N

Y1,

820

1988

-200

601

/20/

96--

b 40

,000

06/2

9/06

2000

24.2

755

,900

30.7

90

0150

3000

Susq

ueha

nna

Riv

er a

t Con

klin

, NY

2,23

2

19

12-2

006

03/1

8/36

20.1

461

,600

06/2

8/06

1115

25.0

276

,800

34.4

>100

&

<500

0150

3980

Che

nang

o R

iver

at E

aton

, NY

24.3

19

64-6

5,

67-2

006

04/0

2/05

8.25

2,78

006

/28/

06--

8.

032,

110

86.8

40

0150

5000

Che

nang

o R

iver

at S

herb

urne

, NY

263

1936

, 38-

2006

03/1

8/36

10.6

0b 12

,500

06/2

8/06

1145

11.3

511

,400

43.3

60

0150

7000

Che

nang

o R

iver

at G

reen

e, N

Y59

3

19

37-2

006

04/0

3/05

18.6

720

,800

06/2

8/06

1520

21.1

627

,100

45.7

>100

&

<500

0150

9000

Tiou

ghni

oga

Riv

er a

t Cor

tland

, NY

292

1938

-200

604

/03/

0514

.07

14,2

0006

/28/

0615

4510

.95

7,62

026

.14

0150

9520

Tiou

ghni

oga

Riv

er a

t Lis

le, N

Y45

3

19

88-2

006

04/0

2/05

10.3

819

,800

06/2

7/06

2300

8.95

15,2

0033

.610

0151

0000

Ots

elic

Riv

er a

t Cin

cinn

atus

, NY

147

1938

-64,

69

-200

604

/03/

0510

.55

12,2

0006

/28/

0601

009.

598,

100

55.1

20

0151

0610

Mer

rill C

reek

Trib

utar

y ne

ar T

exas

Val

ley,

NY

5.32

1976

-81,

83

-200

601

/19/

96--

b 1,

150

06/2

8/06

--

2.94

680

127.

87

0151

1500

Tiou

ghni

oga

Riv

er a

t Ita

ska,

NY

*73

0

19

29-4

1,

42-2

006

07/0

8/35

16.6

161

,100

06/2

8/06

0100

8.64

12,4

0017

.04

0151

2500

Che

nang

o R

iver

nea

r Che

nang

o Fo

rks,

NY

*1,

483

1912

-41,

42

-200

607

/08/

3520

.30

96,0

0006

/28/

0614

2013

.74

41,5

0028

.020

0151

3500

Susq

ueha

nna

Riv

er a

t Ves

tal,

NY

3,94

1

19

35-2

006

03/1

8/36

30.5

0b 10

7,00

006

/28/

0614

2033

.66

119,

000

30.2

>100

&

<500

0151

3831

Susq

ueha

nna

Riv

er a

t Ow

ego,

NY

4,21

6

19

88-9

6,

99-2

006

04/0

3/05

33.1

510

6,00

006

/29/

0601

4535

.90

127,

000

30.1

>100

&

<500


ble

3.

Perio

d-of

-rec

ord

peak

dis

char

ges

and

peak

dis

char

ges

durin

g th

e flo

od o

f Jun

e 26

–29,

200

6, a

t sel

ecte

d U.

S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

New

Yor

k an

d su

rrou

ndin

g ar

eas.

[mi2 ,

squa

re m

iles;

ft, f

eet;

ft3 /s, c

ubic

feet

per

seco

nd; h

r, ho

urs;

ft3 /s

/mi2 ,

cubi

c fe

et p

er se

cond

per

squa

re m

ile; <

, les

s tha

n; >

, gre

ater

than

; -- ,

no

data

ava

ilabl

e]

Stat

ion

num

ber

Stat

ion

nam

e

Peri

od-o

f-re

cord

pea

k di

scha

rge

June

26-

29, 2

006,

pea

k di

scha

rge

Dra

in-

age

area

(m

i2 )

Peri

od o

f re

cord

Dat

e St

age

(ft

)

Dis

-ch

arge

(ft

3 /s)

Dat

e Ti

me

(h

r)St

age

(ft

)

Dis

-ch

arge

(ft

3 /s)

Dis

-ch

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[(f

t3 /s)/

mi2 ]

Recu

rren

ce

inte

rval

(y

ears

)

Susq

ueha

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Rive

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in—

Cont

inue

d

0151

4000

Ow

ego

Cre

ek n

ear O

weg

o, N

Y18

5

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,500

06/2

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0900

9.25

8,32

045

.04

0151

4801

Cat

aton

k C

reek

nea

r Ow

ego,

NY

151

1988

-200

601

/20/

9614

.83

12,2

0006

/28/

06--

11

.06

5,20

034

.44

0151

5000

Susq

ueha

nna

Riv

er n

ear W

aver

ly, N

Y4,

773

1936

-200

603

/18/

3622

.40

b 12

8,00

006

/29/

0606

0022

.52

128,

000

26.8

40

0153

1000

Che

mun

g R

iver

at C

hem

ung,

NY

*2,

506

1903

-78,

79

-200

606

/23/

7231

.62

189,

000

06/2

8/06

0600

12.1

427

,200

10.9

<2

0153

1500

Susq

ueha

nna

Riv

er a

t Tow

anda

, PA

7,79

7

19

13-2

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06/2

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332

0,00

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18.1

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Stre

ams

Trib

utar

y To

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e On

tario

0423

4000

Fall

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ek n

ear I

thac

a, N

Y12

6

19

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006

07/0

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15,5

0006

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992,

320

18.4

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0423

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Flin

t Cre

ek a

t Phe

lps,

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2

19

59-9

5,

2002

-06

03/3

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5.83

2,94

006

/29/

0602

002.

0910

01.

0<2

0424

3500

One

ida

Cre

ek a

t One

ida,

NY

113

1949

-200

610

/09/

7615

.01

9,11

006

/28/

0606

0013

.34

4,84

042

.85

*Site

s in

pink

indi

cate

sign

ifica

nt re

gula

tion.

Rec

urre

nce

inte

rval

s at t

hese

site

s wer

e ca

lcul

ated

from

stat

istic

al a

naly

ses o

f ann

ual p

eak

disc

harg

es d

urin

g th

e re

gula

ted

perio

d.

No

adju

stm

ents

wer

e m

ade

for t

he a

mou

nt o

f ava

ilabl

e st

orag

e in

the

rese

rvoi

rs b

efor

e or

dur

ing

flood

s nor

for c

hang

es in

regu

latio

n pr

oced

ures

dur

ing

the

perio

d of

regu

latio

n.

Oth

er st

udie

s, su

ch a

s floo

d-in

sura

nce

stud

ies,

and

othe

r pro

cedu

res c

an b

e in

vest

igat

ed fo

r alte

rnat

e m

etho

ds o

f det

erm

inin

g di

scha

rge

recu

rren

ce in

terv

als a

t the

se si

tes.

**Si

te n

ot sh

own

in fi

g. 4

. **

*Site

s in

gree

n in

dica

te re

curr

ence

inte

rval

s com

pute

d fr

om st

atis

tical

ana

lyse

s of a

nnua

l pea

k di

scha

rges

usi

ng th

e en

tire

perio

d of

reco

rd a

nd a

gree

d up

on b

y a

mul

ti-ag

ency

com

mitt

ee (S

chop

p an

d Fi

rda,

200

8).

a At f

orm

er si

te.

b Est

imat

ed.

c Flo

od fr

eque

ncy

prov

ided

by

USG

S Pe

nsyl

vann

ia W

ater

Sci

ence

Cen

ter.


10100

1,00

0

10,0

00

100,

000

1,00

0,00

0 1010

01,

000

10,0

00

DRAI

NAG

E AR

EA, I

N S

QUAR

E M

ILES

DISCHARGE, IN CUBIC FEET PER SECOND

Prev

ious

max

imum

—un

regu

late

d st

ream

flow

Prev

ious

max

imum

—re

gula

ted

stre

amflo

w

Floo

d of

Jun

e 20

06—

unre

gula

ted

stre

amflo

w

Floo

d of

Jun

e 20

06—

regu

late

d st

ream

flow

Figu

re 5

A.

Peak

dis

char

ges

for t

he fl

ood

of J

une

26–2

9, 2

006,

and

pre

viou

s m

axim

um k

now

n di

scha

rge

at s

elec

ted

stre

am-g

agin

g st

atio

ns in

the

Huds

on R

iver

ba

sin,

NY,

as

a fu

nctio

n of

dra

inag

e ar

ea.


0.10

1.001010

0

1,00

0

10,0

00

100,

000

1,00

0,00

0 0.10

1.00

1010

01,

000

10,0

00

DRAI

NAG

E AR

EA, I

N S

QUAR

E M

ILES

DISCHARGE, IN CUBIC FEET PER SECONDPr

evio

us m

axim

um—

regu

late

d st

ream

flow

Floo

d of

Jun

e 20

06—

regu

late

d st

ream

flow

Prev

ious

max

imum

—un

regu

late

d st

ream

flow

Floo

d of

Jun

e 20

06—

unre

gula

ted

stre

amflo

w

Figu

re 5

B.

Peak

dis

char

ges

for t

he fl

ood

of J

une

26–2

9, 2

006,

and

pre

viou

s m

axim

um k

now

n di

scha

rge

at s

elec

ted

stre

am-g

agin

g st

atio

ns in

the

Dela

war

e Ri

ver b

asin

, NY,

as

a fu

nctio

n of

dra

inag

e ar

ea.


10100

1,00

0

10,0

00

100,

000

1,00

0,00

0

110

100

1,00

010

,000

DRAI

NAG

E AR

EA, I

N S

QUAR

E M

ILES


Prev

ious

max

imum

—un

regu

late

d st

ream

flow

Prev

ious

max

imum

—re

gula

ted

stre

amflo

w

Floo

d of

Jun

e 20

06—

unre

gula

ted

stre

amflo

w

Floo

d of

Jun

e 20

06—

regu

late

d st

ream

flow

Figu

re 5

C.

Peak

dis

char

ges

for t

he fl

ood

of J

une

26–2

9, 2

006,

and

pre

viou

s m

axim

um k

now

n di

scha

rge

at s

elec

ted

stre

am-g

agin

g st

atio

ns in

the

Susq

ueha

nna

Rive

r bas

in, N

Y, a

s a

func

tion

of d

rain

age

area

.


Hamilton

Lewis

Oneida

Delaware

Herkimer

Otsego

Warren

Ulster

Greene

Saratoga

Fulton

Albany

Essex

SchoharieChenango

Madison

Sullivan

Broome

Dutchess

Columbia

Montgomery

Was

hing

ton

Jefferson

Schenectady

Ren

ssel

aer

East

C ana

da C

reek

M o h a w k R i v e r

Cobleskill Creek

West Canada Creek

Hinckley Reservoir

Delta Reservoir

SchoharieReservoir

Scho

harie

C

reek

Rome

Utica

Poland

Cohoes

Albany

Oneonta

Newport

Herkimer

Schoharie

AmsterdamFort Plain

Dolgeville

Tribes Hill

Middleville

Fultonville

Canajoharie

Little Falls

Emmonsburg

Gilboa

GrandGorge

Burtonsville 0135750001351500

01349150

01348000

01347000

01346000

01336000

73°45'75°

43°45'

42°30'

15

0 30 KILOMETERS15

30 MILES0Base from U.S. Geological Survey digital data, 1:100,000, 1983Universal Transverse Mercator Projection, Zone 18,North American Datum (NAD) 1983

NEW YORK

Less than 10

10−49

50−74

75−100

Greater than 100


Recurrence interval, in years

Figure 6A. Peak discharge recurrence intervals at selected U.S. Geological Survey stream-gaging stations in the Mohawk River basin, NY, for the flood of June 26–29, 2006. (Data are shown in table 3.)


CannonsvilleReservoir

Pepacton Reservoir

NeversinkReservoir

Schoharie Reservoir

LakeWallenpaupack

Halfw

ay Brook

Mongaup River

Lackawaxen RiverMiddle Creek

Delaware River

Neversink River

Dyberry Creek


axen River

Shoh

ola C

r.

PromptonReservoir


Hazel

Delhi

RoscoeCooksFalls

Horton

Downsville

HamdenWalton

Sidney

Hancock

Deposit

Hale Eddy

Stilesville

Morsston

Beerston

PondEddy

BarryvilleGodeffroy

Peakville

Harvard

Lordville

Cochecton

Hawley

Bridgeville

HortonvilleCallicoon

Falls Mills

PortJervis

Montague

SparrowBush

MinisinkFord

Margaretville

Skinners Falls

ButternutGrove

CallicoonCenter

LivingstonManor

Rockland

Claryville

Neversink

FishsEddy

E. Bra nc

h C

allico

on Cr.

01438500

01437500

01434000

01428500

01427510

01426500

01425000

01423000

01421000 01420500

01417500

01417000

01413500

01431500

Delaware

Pike

Wayne Sullivan

Ulster

Orange

Chenango

Sussex

Otsego

Lackawanna

Broome

Susquehanna

Monroe

Schoharie

Greene

LuzernePassaic

75°42°30'

41°15'


PENNSYLVANIA

NEW JERSEY

NEW YORK

East Branch D

elaware River


r

Less than 10

10−49

50−74

75−100

Greater than 100



10

0 20 KILOMETERS10

20 MILES0

Beaver KillN.

Bra

nch Callic

oon C

r.

Willowem o c Cr

eek

LittleBeaverKill

01436690

01436000

01435000

01421900

Figure 6B. Peak discharge recurrence intervals at selected U.S. Geological Survey stream-gaging stations in the Delaware River basin, NY, for the flood of June 26–29, 2006. (Data are shown in table 3.)


01509520

01500500

0150273101513831

01531000

01531500

01514801

PENNSYLVANIA

NEW YORK

Owego

Otego

Afton

Athens

Oxford

Greene

WindsorBinghamtonDickinson

Oneonta

NorwichMilford

Earlville

Nineveh

Pittsfield

Great BendSusquehannaDepot

Cooperstown

ConklinNichols

Unadilla

Butternuts

Bainbridge

JohnsonCity

Vestal

01515000

01514000 01513500

01512500

01511500

01510000

01509000

01507000

01503000

01502500

0150000001502632

Chenango River

Oneida

Delaware

Otsego

Wayne

Sullivan

Tioga Broome

Herkimer

Cayuga

Chenango

Pike

Bradford

Madison

Onondaga

Susquehanna

Cortland

Tompkins

Wyoming

Sullivan

Fulton

Luzerne

Orange

Ulster

LackawannaSc

hoha

rie

Montgomery

Sussex

Seneca

Greene

Lycoming

Schu

yler

Chem

ung

75°76°10'

43°

41°50'

Whitney Point Lake East

Sidney Lake

Otselic

River


15

0 30 KILOMETERS15

30 MILES0

Less than 10

10−49

50−74

75−100

Greater than 100



Una

dill

a R

iver

Tioughnioga RiverSusquehanna R iver

Figure 6C. Peak discharge recurrence intervals at selected U.S. Geological Survey stream-gaging stations in the Susquehanna River basin, NY, for the flood of June 26–29, 2006. (Data are shown in table 3.)


A-1 Mohawk River below Delta Dam near Rome, NY

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

10,000

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

Annual peak discharge

100-year recurrence interval50-year recurrence interval10-year recurrence interval

10-year weighted moving average

EXPLANATION

A-2 Mohawk River near Little Falls, NY

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

Figure 7A. (A–1, A–2) Annual peak discharges through 2006, and discharges of the 10-, 50-, and 100-year recurrence intervals for selected stations in the Mohawk River basin, NY.


A-3 Schoharie Creek at Burtonsville, NY

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

90,000

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

A-4 Mohawk River at Cohoes, NY

0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D




EXPLANATION

Figure 7A. (A–3, A–4) Annual peak discharges through 2006, and discharges of the 10-, 50-, and 100-year recurrence intervals for selected stations in the Mohawk River basin, NY.


The USGS stream-gaging stations along the Mohawk River from below Delta Dam to Cohoes are regulated by power-generation dams, municipal water suppliers, and the New York State Canal Corporation. Recurrence intervals at these USGS stream-gaging stations ranged from less than 5 years to greater than 100 years. The USGS stream-gaging station Mohawk River below Delta Dam near Rome recorded a peak discharge of 3,100 ft3/s on June 28 which had a recurrence interval of less than 5 years (fig. 6A). Recurrence intervals at USGS stream-gaging stations on the major tributaries to the Mohawk River along the East and West Canada Creeks and the Schoharie Creek ranged from greater than 500 years at East Canada Creek at East Creek (01348000), to greater than 100 years at the West Canada Creek at Kast Bridge (01346000), to as low as less than 5 years at Schoharie Creek at Burtonsville (01351500). A major increase in the magnitude and frequency of the flooding along the Mohawk River downstream from the Mohawk River below Delta Dam near Rome stream-gaging station can be attributed to greater than 100-year inflows from the West and East Canada Creeks. The USGS stream-gaging station West Canada Creek at Kast Bridge, which has been in operation since 1920, recorded a new period-of-record maximum of 21,800 ft3/s. The East Canada Creek at East Creek stream-gaging station, in operation since 1945, also recorded a new period-of-record maximum of 31,500 ft3/s. The USGS stream-gaging station Schoharie Creek at Burtonsville recorded a peak discharge of 28,100 ft3/s on June 28, but the period-of-record maximum of 81,600 ft3/s was recorded on January 20, 1996 (fig. 7A–3). The lack of major inflow from Schoharie Creek allowed for the natural attenuation of the peak discharge and a recurrence interval of only 15 years downstream at the Mohawk River at Cohoes stream-gaging station. The USGS stream-gaging station Mohawk River at Cohoes recorded a peak discharge of 96,400 ft3/s on June 29 (fig. 7A–4). The USGS stream-gaging station Hudson River at Green Island (01358000), located downstream from the confluence with the Mohawk River, recorded a peak discharge of 123,000 ft3/s on June 29, which has a recurrence interval of only 5 years. Antecedent conditions, precipitation and runoff patterns, and basin characteristics all play a role in determining the peak water-surface elevation and discharge at a stream-gaging station. Discharge hydrographs for selected USGS stream-gaging stations in the Mohawk River Basin for the period June 25–30, 2006, are shown in figure 8.

Delaware River Basin

All USGS stream-gaging stations along the East and West Branches of the Delaware River and along the main stem of the Delaware River down to Port Jervis recorded peak discharges on June 28. The peak discharge recorded at the stream-gaging station East Branch Delaware River at Margaretville (01413500), upstream from the Pepacton Reservoir, was 13,600 ft3/s. The peak discharges recorded

at the stream-gaging stations West Branch Delaware River upstream from Delhi (01421900) and West Branch Delaware River at Walton (01423000), upstream from the Cannonsville Reservoir, were 8,060 ft3/s and 28,600 ft3/s, respectively (fig. 8B–3). The flood frequency of the peak discharge at East Branch Delaware River at Margaretville was estimated to have a 9-year recurrence interval (table 3). The flood frequency along the West Branch of the Delaware River, upstream from Cannonsville Reservoir, was much greater than that recorded along the East Branch upstream from Pepacton Reservoir (fig. 6B). The peak discharge at the West Branch Delaware River upstream from Delhi had an estimated recurrence interval of 20 years, and the peak discharge at West Branch Delaware River at Walton had an estimated recurrence interval of greater than 100 years (fig. 7B–6). Recurrence intervals were generally 25 years or less for peak discharges along several gaged tributaries to the East Branch of the Delaware River upstream from the Pepacton Reservoir. Flood frequency could not be computed at gaged tributaries upstream from Cannonsville Reservoir because of the short periods of record.

The peak discharges at USGS stream-gaging stations downstream from Pepacton and Cannonsville Reservoirs, along the East and West Branches of the Delaware River, equaled or exceeded the previous period-of-record maximums set during the 2004 and 2005 floods. The USGS stream-gaging station East Branch Delaware River at Downsville (01417000), immediately downstream from the Pepacton Reservoir, recorded a peak discharge of 20,000 ft3/s on June 28 (fig. 8B–2). The estimated recurrence interval computed for this peak is 50 years. The period-of-record maximum for this station since the Pepacton Reservoir began storage operations in September 1954 is 20,200 ft3/s, recorded on September 18, 2004 (fig.7B–2). The peak discharge at the USGS stream-gaging station East Branch Delaware River at Harvard (01417500), 22,100 ft3/s, has a recurrence interval of 45 years (figs. 7B–3, 8B–2). Farther downstream along the East Branch of the Delaware River, the peak discharge at the USGS stream-gaging station at Fishs Eddy (01421000), 77,400 ft3/s, had a recurrence interval of greater than 100 years and as of 2006 is a new period-of-record maximum (figs. 7B–5, 8B–2). The increase in flood magnitude and frequency at this station compared to those for the Downsville and Harvard stream-gaging stations is a result of the significant inflow from the Beaver Kill. The Beaver Kill at Cooks Falls stream-gaging station (01420500) also recorded a new period-of-record maximum of 62,400 ft3/s on June 28, which had a recurrence interval greater than 100 years (figs. 6B, 7B–4).

The USGS stream-gaging station West Branch Delaware River at Stilesville (01425000) recorded a new period-of-record maximum discharge, since the current degree of regulation began in 1963, of 33,100 ft3/s on June 28 (figs. 7B–7, 8B–4). The recurrence interval for this peak was estimated to be greater than 100 years (fig. 6B). The June 28, 2006, peak discharge is also the maximum recorded discharge at this station since the station was put into operation in July 1952. The West Branch Delaware River


B-1 East Branch Delaware River at Margaretville, NY

0

5,000

10,000

15,000

20,000

25,000

30,000AN

NUA

L PE

AK D

ISCH

ARGE

, IN

CUB

IC F

EET

PER

SECO

ND

B-2 East Branch Delaware River at Downsville, NY

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

Pepacton Reservoir began operations in September 1954




EXPLANATION

35,000

Figure 7B. (B–1, B–2) Annual peak discharges through 2006, and discharges of the 10-, 50-, and 100-year recurrence intervals for selected stations in the Delaware River basin, NY.


B-3 East Branch Delaware River at Harvard, NY

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

DPepacton Reservoir began operations in September 1954

B-4 Beaver Kill at Cooks Falls, NY

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D




EXPLANATION

Figure 7B. (B–3, B–4) Annual peak discharges through 2006, and discharges of the 10-, 50-, and 100-year recurrence intervals for selected stations in the Delaware River basin, NY


B-5 East Branch Delaware River at Fishs Eddy, NY

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

90,000

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

B-6 West Branch Delaware River at Walton, NY

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D




EXPLANATION

Pepacton Reservoir began operations in September 1954



at Hale Eddy stream-gaging station (01426500) recorded a new period-of-record maximum of 43,400 ft3/s on June 28 (figs. 7B–8, 8B–4). This peak discharge has an estimated recurrence interval of greater than 100 years and is the maximum discharge at this station since at least 1903.

Along the main stem of the Delaware River downstream from the confluence of the East and West Branches near Hancock to Port Jervis, peak discharges were recorded at three USGS stream-gaging stations. The Delaware River at Callicoon stream-gaging station (01427510), which has been in operation since 1975, recorded a new period-of-record maximum of 144,000 ft3/s on June 28 (figs. 7B–9, 8B–5). The USGS stream-gaging station Delaware River above Lackawaxen River near Barryville (01428500) also recorded a new period-of-record maximum of 151,000 ft3/s on June 28 (figs. 7B–10, 8B–5). The peak discharges at Callicoon and Barryville have an estimated recurrence interval of greater than 100 years. The Delaware River at Port Jervis is the most downstream USGS stream-gaging station along the main stem of the Delaware River in New York. The peak discharge at the Delaware River at Port Jervis stream-gaging station (01434000) was 189,000 ft3/s, recorded on June 28 (figs. 7B–11, 8B–5). This peak is a new period-of-record maximum, since regulation began in 1963, and ranks as the third highest peak since 1903 (fig. 7B–11). The recurrence interval for this peak discharge was calculated to be 80 years. The maximum peak discharge at this station was recorded on August 19, 1955, and unlike the June 2006 flood, the 1955 flood peak was magnified by major inflows from the Lackawaxen and Mongaup Rivers. Discharge hydrographs for selected USGS stream-gaging stations in the Delaware River basin for the period of June 25–30, 2006, are shown in figure 8.

Susquehanna River Basin

Several USGS stream-gaging stations along the Susquehanna River recorded new period-of-record maximums as a result of the June 2006 flood. The Susquehanna River at Unadilla stream-gaging station (01500500), which has been in operation since 1938, recorded a new period-of-record maximum of 35,100 ft3/s on June 29 with a recurrence interval of greater than 100 years (figs. 6C, 7C–1, 8C–1). The peak exceeded the estimated peak discharge for the March 18, 1936, flood at this site. The Unadilla River is a major tributary to the Susquehanna River and enters downstream from the Susquehanna River at Unadilla stream-gaging station. The recurrence interval for the peak discharge of 23,100 ft3/s on June 28 at the Unadilla River at Rockdale stream-gaging station (01502500) was estimated to be greater than 100 years and is a new period-of-record maximum (figs. 7C–2, 8C–1).

The USGS stream-gaging stations Susquehanna River at Bainbridge (01502632), Susquehanna River at Windsor (01502731), and Susquehanna River at Conklin (01503000) each recorded a new period-of-record maximum on June 28 or

29. The Susquehanna River at Conklin stream-gaging station has been in operation since 1913, and its previous period-of-record maximum of 61,600 ft3/s was set during the March 1936 flood. The peak discharge recorded at the Susquehanna River at Conklin stream-gaging station on June 28 was 76,800 ft3/s (fig. 7C–3). Recurrence intervals for the June 2006 flood peak discharges at these three stations range from 90 to greater than 100 years.

Most USGS stream-gaging stations along the Susquehanna River from Conklin to Vestal and on the Chenango, Tioughnioga, and Otselic Rivers recorded peak discharges on June 28. It was assumed that rainfall patterns across the region generated increased runoff downstream from Bainbridge, which resulted in a steeper slope to the rising limb of the hydrographs for this area and subsequently earlier peak discharges at downstream stations. The discharges at the Susquehanna River at Unadilla and Bainbridge stream-gaging stations continued to rise at a steady rate until they peaked on June 29 (fig. 8C–1). Peak inflows to the Susquehanna River from the Chenango and Tioughnioga Rivers were not at record levels. The recurrence interval for the peak discharge at the Chenango River at Greene stream-gaging station (01507000), which was a new period-of-record maximum, was estimated to be greater than 100 years, but the recurrence interval downstream at the Chenango River at Chenango Forks (01512500) stream-gaging station was only 20 years (fig. 7C–7). The recurrence intervals for the peak discharges at the USGS stream-gaging stations along the Tioughnioga River at Lisle (01509520) and Itaska (01511500) were less than 20 years (fig. 6C). Flood peaks in this area along other major tributaries, including the Owego and Chemung Rivers, were less than a 5-year recurrence interval. Although discharges on the major tributaries were below record levels downstream from the confluence of the Susquehanna and Unadilla Rivers, they were sufficient to maintain record levels along the Susquehanna River from Unadilla downstream to Waverly. The USGS stream-gaging station Susquehanna River at Vestal (01513500) recorded a peak discharge of 119,000 ft3/s on June 28, which has a recurrence interval of greater than 100 years; the peak discharge exceeded both the period-of-record maximum and the estimated peak discharge of 107,000 ft3/s for the March 18, 1936, flood at this site (fig. 7C–8). The floods of March 1936 and June 1972 were devastating along the Susquehanna River near and downstream from Waverly. The USGS stream-gaging station Susquehanna River near Waverly, NY, (01515000) has been in continuous operation since February 1937. The period-of-record maximum for the Susquehanna River near Waverly stream-gaging station was 121,000 ft3/s recorded on June 23, 1972 (fig. 7C–10). The March 18, 1936, peak discharge was estimated to be 128,000 ft3/s. The June 29, 2006, peak discharge was 128,000 ft3/s and was estimated to have a recurrence interval of 40 years (fig. 6C, 8C–2). The June 2006 flood ranks as the worst flood along the Susquehanna River for areas as far upstream as Unadilla and as far downstream as just upstream from Waverly since the early 1930s and possibly


B-7 West Branch Delaware River at Stilesville, NY

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

Cannonsville Reservoir began operations in October 1963

B-8 West Branch Delaware River at Hale Eddy, NY

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

45,000

50,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

Cannonsville Reservoir began operations in October 1963




EXPLANATION



B-9 Delaware River at Callicoon, NY

0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

160,000

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

B-10 Delaware River above Lackawaxen near Barryville, NY

0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

160,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

Pepacton Reservoir beganoperations in September 1954

Cannonsville Reservoir beganoperations in October 1963




EXPLANATION

Pepacton Reservoir began operations in September 1954 Cannonsville Reservoir began operations in October 1963



B-11 Delaware River at Port Jervis, NY

0

50,000

100,000

150,000

200,000

250,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

Pepacton Reservoir beganoperations in September 1954

Cannonsville Reservoir beganoperations in October 1963




EXPLANATION

Figure 7B. (B–11) Annual peak discharges through 2006, and discharges of the 10-, 50-, and 100-year recurrence intervals for selected stations in the Delaware River basin, NY.


C-2 Unadilla River at Rockdale, NY

0

5,000

10,000

15,000

20,000

25,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

C-1 Susquehanna River at Unadilla, NY

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

East Sydney Lake began operations in November 1949




EXPLANATION

Figure 7C. (C–1, C–2) Annual peak discharges through 2006, and discharges of the 10-, 50-, and 100-year recurrence intervals for selected stations in the Susquehanna River basin, NY.


C-3 Susquehanna River at Conklin, NY

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

90,000

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

C-4 Chenango River at Sherburne, NY

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D




EXPLANATION



C-6 Otselic River at Cincinnatus, NY

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

C-5 Tioughnioga River at Cortland, NY

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D




EXPLANATION



C-7 Chenango River atChenango Forks, NY

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

90,000

100,000

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

C-8 Susquehanna River at Vestal, NY

0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D




EXPLANATION

Whitney Point Lake began operations in March 1942



C-9 Owego Creek near Owego, NY

0

5,000

10,000

15,000

20,000

25,000

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D

C-10 Susquehanna River near Waverly, NY

0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

160,000

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

WATER YEAR

ANN

UAL

PEAK

DIS

CHAR

GE, I

N C

UBIC

FEE

T PE

R SE

CON

D




EXPLANATION



10100

1,00

0

10,0

00

100,

000

DATE


Wes

t Can

ada

Cree

k at

Kas

t Brid

ge, N

YM

ohaw

k Ri

ver n

ear L

ittle

Fal

ls, N

YCa

najo

harie

Cre

ek n

ear C

anaj

ohar

ie, N

YM

ohaw

k Ri

ver a

t Coh

oes,

NY

6/25

/200

66/

26/2

006

6/27

/200

66/

28/2

006

6/29

/200

66/

30/2

006

7/01

/200

66/

25/2

006

6/26

/200

66/

27/2

006

6/28

/200

66/

29/2

006

6/30

/200

67/

01/2

006

10100

1,00

0

10,0

00

100,

000

DATE


East

Bra

nch

Dela

war

e Ri

ver a

t Mar

gret

ville

, NY

Mill

Bro

ok a

t Dun

rave

n, N

YTr

empe

r Kill

nea

r And

es, N

Y

10100

1,00

0

10,0

00

100,

000

DATE


Wes

t Bra

nch

Dela

war

e Ri

ver u

pstre

am fr

om D

elhi

, NY

Wes

t Bra

nch

Dela

war

e Ri

ver a

t Wal

ton,

NY

6/25

/200

66/

26/2

006

6/27

/200

66/

28/2

006

06/2

9/20

066/

30/2

006

7/01

/200

6

A-1

B-1

B-2

B-3

10100

1,00

0

10,0

00

100,

000

6/25

/200

66/

26/2

006

6/27

/200

66/

28/2

006

6/29

/200

66/

30/2

006

7/01

/200

6

DATE


East

Bra

nch

Dela

war

e Ri

ver a

t Dow

nsvi

lle, N

YEa

st B

ranc

h De

law

are

Rive

r at H

arva

rd, N

YEa

st B

ranc

h De

law

are

Rive

r at F

ishe

s Ed

dy, N

Y

Figu

re 8

. Di

scha

rge

hydr

ogra

phs

for s

elec

ted

stre

am-g

agin

g st

atio

ns in

the

(A–1

) Moh

awk

Rive

r bas

in, N

Y, J

une

25–3

0, 2

006.

(Loc

atio

ns s

how

n in

figu

re 4

A),

(B–1

to B

–5) D

elaw

are

Rive

r bas

in, N

Y, J

une

25–3

0, 2

006.

(Loc

atio

ns s

how

n in

figu

re 4

B.),

and

(C–1

to C

–2) S

usqu

ehan

na R

iver

bas

in, N

Y, J

une

25–3

0, 2

006.

(L

ocat

ions

sho

wn

in fi

gure

4C.

)


6/25

/200

66/

26/2

006

6/27

/200

66/

28/2

006

6/29

/200

66/

30/2

006

7/01

/200

61010

0

1,00

0

10,0

00

100,

000

DATE


Wes

t Bra

nch

Dela

war

e Ri

ver a

t Stil

esvi

lle, N

YW

est B

ranc

h De

law

are

Rive

r at H

ale

Eddy

, NY

100

1,00

0

10,0

00

100,

000

1,00

0,00

0

DATE


Dela

war

e Ri

ver a

t Cal

licoo

n, N

YDe

law

are

Rive

r abo

ve L

acka

wax

en R

vr n

ear B

arry

ville

, NY

Dela

war

e Ri

ver a

t Por

t Jer

vis,

NY

6/25

/200

66/

26/2

006

6/27

/200

66/

28/2

006

6/29

/200

66/

30/2

006

7/01

/200

6

100

1,00

0

10,0

00

100,

000

6/25

/200

66/

26/2

006

6/27

/200

66/

28/2

006

6/29

/200

66/

30/2

006

7/01

/200

6

DATE


Unad

illa

Rive

r at R

ockd

ale,

NY

Chen

ango

Riv

er a

t Gre

ene,

NY

Susq

ueha

nna

Rive

r at U

nadi

lla, N

Y

Tiou

ghni

oga

Rive

r at L

isle

, NY

B-4

B-5

C-1

C-2

100

1,00

0

10,0

00

100,

000

1,00

0,00

0 6/25

/200

66/

26/2

006

6/27

/200

66/

28/2

006

6/29

/200

66/

30/2

006

7/01

/200

6

DATE


Susq

ueha

nna

Rive

r nea

r Wav

erly

, NY

Chem

ung

Rive

r at C

hem

ung,

NY

Susq

ueha

nna

Rive

r at O

weg

o, N

Y

Susq

ueha

nna

Rive

r at T

owan

da, P

A

Figu

re 8

. Di

scha

rge

hydr

ogra

phs

for s

elec

ted

stre

am-g

agin

g st

atio

ns in

the

(A–1

) Moh

awk

Rive

r bas

in, N

Y, J

une

25–3

0, 2

006.

(Loc

atio

ns s

how

n in

figu

re 4

A.),

(B–1

, to

B–5)

Del

awar

e Ri

ver b

asin

, NY,

Jun

e 25

–30,

200

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Effects of Reservoirs on Flooding 47

1784 (Grover, 1937; Bailey and others, 1975). Discharge hydrographs for selected USGS stream-gaging stations in the Susquehanna River basin for the period June 25–30, 2006, are shown in figure 8.

Effects of Reservoirs on FloodingThe streamflow along reaches of the Mohawk, Delaware,

and Susquehanna Rivers is affected by the outflow from one or more reservoirs in each basin. Data for the Delta, Hinckley, and Schoharie Reservoirs in the Mohawk River basin; the Pepacton, Cannonsville, Neversink, Prompton, and General Edgar Jadwin Reservoirs and Lake Wallenpaupack in the Delaware River basin; and the East Sidney and Whitney Point Lakes in the Susquehanna River basin are presented below. Reservoir water-level data for Delta Reservoir were provided by the New York State Thruway Authority, and NYCDEP provided the water-level data for the Pepacton, Cannonsville, and Neversink Reservoirs.

Mohawk River Basin

The Delta and Hinkley Reservoirs are operated and maintained by the New York State Canal Corporation, a division of the New York State Thruway Authority, and were originally constructed for navigation of the Erie Barge canal. Currently, these reservoirs are used for water supply, fisheries, power generation, and canal operations, and there is no provision for the planned regulation or mitigation of floodwaters. The Schoharie Reservoir is operated and maintained by the NYCDEP as a water-supply reservoir and it also does not have any provision for the planned regulation or mitigation of floodwater flows.

Delta Reservoir (fig. 4A) releases water at Delta Dam on the Mohawk River, which is about 4 mi upstream from Rome, NY, and has a drainage area of 148 mi2. The dam was completed on August 3, 1912; controlled storage is documented to have started on May 1, 1913. The usable capacity of the reservoir is 2,800 million cubic feet at the crest of the spillway. The spillway crest elevation is 550.0 ft, Barge Canal Datum. The maximum observed elevation during 1951 to 2005 was 552.8 ft on June 22, 1972; April 17, 1994; and January 9, 1998. The maximum observed elevation during 2006 was 551.9 ft on June 28 and 29. The USGS stream-gaging station Mohawk River below Delta Dam near Rome (01336000) recorded a peak discharge of 3,100 ft3/s on June 28, which was less than a 5-year recurrence interval.

The Hinckley Reservoir (fig. 4A) is on West Canada Creek at Hinckley, NY, and has a drainage area of 372 mi2. The West Canada Creek is a major tributary to the Mohawk River between Rome and Little Falls. The Hinckley Reservoir began storage operations in March 1914 and is formed by an earth and concrete dam, Hinckley Dam. The usable

capacity of the reservoir between the elevations 1,173.5 and 1,225.0 ft, elevation of spillway, is 3,320 million cubic feet. The elevation of the water level in the reservoir on June 26, 2006, was 1,223.0 ft, and the reservoir was at 93 percent of capacity (fig 9A–1). The USGS stream-gaging station West Canada Creek at Wilmurt (01343060), upstream from the Hinckley Reservoir, recorded a peak discharge of 23,200 ft3/s at 12:30 p.m. on June 28. The drainage area upstream from this stream-gaging station is 258 mi2, which is about 70 percent of the total contributing area to the Hinckley Reservoir. The peak discharge recorded at this station per unit of contributing drainage area yields a peak runoff of about 90 (ft3/s)/mi2. Applying this peak runoff to the entire Hinckley Reservoir drainage area yields an estimated maximum inflow of about 33,500 ft3/s on June 28. The water level in the Hinckley Reservoir reached a maximum elevation of 1,229.8 ft shortly before midnight on June 28 (fig. 9A–1). The period-of-record maximum elevation of 1,230.2 ft for the Hinckley Reservoir was set on October 2, 1945.

The Schoharie Reservoir (fig. 4A) is located along the Schoharie Creek a few miles east of Grand Gorge, NY, and has a drainage area of 315 mi2. The reservoir began storage operations on July 24, 1926, and is formed by a masonary and earth dam. The usable capacity of the reservoir is 19,583 Mgal between the minimum operating elevation of 1,050.0 ft and the crest of the spillway at elevation 1,130.0 ft. On June 26, 2006, the daily mean elevation of the Schoharie Reservoir was 1,121.57 ft (fig. 9A–2). The USGS stream-gaging station Schoharie Creek at Prattsville (01350000), recorded a peak discharge of 19,100 ft3/s (table 3) on June 26, which was less than a 5-year recurrence interval, and a secondary peak of 17,500 ft3/s on June 28. The drainage area upstream from this stream-gaging station is 237 mi2, which is about 75 percent of the total contributing area to the Schoharie Reservoir. The peak discharge recorded at this station per unit of contributing drainage area yields a peak runoff of 81 (ft3/s)/mi2 on June 26 and 74 (ft3/s)/mi2 on June 28. By applying these peak runoffs to the entire Schoharie Reservoir drainage area, an estimated maximum inflow of about 25,500 ft3/s was computed for June 26 and an estimated maximum inflow of 23,300 ft3/s for June 28. The water level in the reservoir reached a maximum elevation of 1,131.36 ft for this storm at 1:30 p.m. on June 28. The peak outflow from the reservior was estimated on the basis of the recorded peak discharge at the USGS stream-gaging station Schoharie Creek at Gilboa (01350101) to be 17,500 ft3/s (fig. 9A–2).


The Pepacton, Cannonsville, and Neversink Reservoirs are operated and maintained by the NYCDEP as water-supply reservoirs. The reservoirs have no provision for the planned regulation or mitigation of floodwaters. In addition, the amount of water that can be diverted through water-supply


Spillway crest elevation = 1,225.0 ft.

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

0:006/26/2006

12:00 0:006/27/2006

12:00 0:006/28/2006

12:00 0:006/29/2006

12:00 0:006/30/2006

12:00 0:007/1/2006

DATE AND TIME

DISC

HARG

E, IN

CUB

IC F

EET

PER

SECO

ND

1,222

1,223

1,224

1,225

1,226

1,227

1,228

1,229

1,230

ELEV

ATIO

N, I

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EET

ABOV

E BA

RGE

CAN

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ATUM

Estimated inflowWest Canada Creek at Kast BridgeWater-surface elevation

DATE AND TIME

0

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0:006/26/2006

12:00 0:006/27/2006

12:00 0:006/28/2006

12:00 0:006/29/2006

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12:00 0:007/1/2006

DISC

HARG

E, IN

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IC F

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1,122

1,124

1,126

1,128

1,130

1,132

1,134

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

DiversionsOutflowEstimated inflow

Water-surface elevation

Spillway crest elevation = 1,130.0 ft.

Figure 9A–1. Fifteen minute inflow, and water-surface elevation at the Hinkley Reservoir, NY, June 26–30, 2006.

Figure 9A–2. Fifteen minute inflow, outflow, diversions and water-surface elevation at the Schoharie Reservoir, NY, June 26–30, 2006.


tunnels is inconsequential in comparison to the volume of floodwater flows.

The Pepacton Reservoir (fig. 4b) is located along the East Branch of the Delaware River just upstream from Downsville, NY, and has a drainage area of 372 mi2. The Pepacton Reservoir began storage operations on September 15, 1954, and is formed by an earth filled rockfaced dam. The usable capacity of the reservoir is 140,190 Mgal, measured between the minimum operating elevation of 1,152.0 ft and the spillway crest at an elevation of 1,280.0 ft. The total capacity at the spillway crest, including dead storage, is 149,799 Mgal.

The Pepacton Reservoir was at about 101 percent of capacity at 7 a.m. on June 26, 2006, and was spilling. The combined streamflow from four USGS stream-gaging stations upstream from the Pepacton Reservoir were used to approximate the inflow to the reservoir during the June 2006 flood. The total drainage area gaged by summing the four USGS stream-gaging stations—East Branch Delaware River at Margaretville(01413500), Platte Kill near Dunraven (01414000), Mill Brook near Dunraven (01414500), and Tremper Kill near Andes (01415000),— is approximately 256 mi2 . This accounts for about 69 percent of the total contributing area to the Pepacton Reservoir. The hydrographs for these stream-gaging stations were combined to produce an estimated hydrograph of the inflow to the Pepacton Reservoir. The peak runoff, from the estimated inflow hydrograph, per unit of contributing drainage area was then computed to be 70 (ft3/s)/mi2. Applying this peak runoff to the entire Pepacton Reservoir drainage area yields an estimated maximum inflow of about 26,000 ft3/s on June 28 (fig. 9B–1).

The water level in the Pepacton Reservoir reached a new period-of-record maximum elevation of 1,283.74 ft on June 28, as a result of this storm (fig. 9B–1). The previous period-of-record maximum observed elevation for the Pepacton Reservoir was 1,283.68 ft recorded on April 3, 2005. The USGS stream-gaging station East Branch Delaware River at Downsville (01417000), immediately downstream from the Pepacton Reservoir, recorded a peak discharge of 20,000 ft3/s in the early afternoon of June 28. This is the second highest peak recorded at the USGS stream-gaging station in Downsville since the reservoir began operations in 1954 and the fourth highest peak since the stream-gaging station was installed in July 1941 (fig. 7B–2). Although the Pepacton Reservoir was spilling on June 26, the peak outflow was still attenuated by about 23 percent because of the storage effect of the reservoir.

During flooding events in recent years, the contents of the Pepacton Reservoir have been at various levels at the start of each event. Prior to the flood of January 19–20, 1996, the Pepacton Reservoir was at 58 percent of capacity. During the January 1996 flood, the water level in the Pepacton reservoir rose nearly 20 ft, and the peak inflow to the reservoir was estimated to be greater than 50,000 ft3/s (Lumia, 1998). The period-of-record maximum discharge at the East Branch Delaware River at Margaretville stream-gaging station is 25,800 ft3/s recorded on January 19, 1996 (fig. 7B–1). The

East Branch Delaware River at Margaretville stream-gaging station is upstream from the Pepacton Reservoir and gages about 44 percent of the contributing drainage area to the reservoir. The outflow during the time of the peak inflow was about 1,800 ft3/s. The recorded peak discharge at the East Branch Delaware River at Downsville stream-gaging station, just downstream from the reservoir, was less than 2,600 ft3/s during the flood of January 18–19, 1996. Prior to the flood of September 18–19, 2004, the Pepacton Reservoir was at 99.2 percent of capacity. During the September 2004 flood, the peak inflow to the Pepacton Reservoir was estimated to be about 37,500 ft3/s on September 18, 2004 (Brooks, 2005). The recorded peak discharge at the East Branch Delaware River at Downsville stream-gaging station was 18,000 ft3/s on September 18, 200.

The Cannonsville Reservoir (fig. 4B) located along the West Branch of the Delaware River approximately 1.8 mi southeast of Stilesville, NY, has a drainage area of 454 mi2. The Cannonsville Reservoir is formed by an earth filled, rockfaced dam and began storage operations on September 30, 1963. The usable capacity of the reservoir is 95,706 Mgal between the minimum operating elevation of 1,040.00 ft and the spillway crest elevation of 1,150.00 ft. The total capacity at the spillway crest, including dead storage, is 98,618 Mgal.

The Cannonsville Reservoir was at 101 percent of capacity at 7 a.m. on June 26, 2006, and was spilling. The inflow to the Cannonsville Reservoir was approximated by combining the hydrographs for the USGS stream-gaging stations on the two major tributaries to the reservoir. The total drainage area gaged by the USGS stream-gaging stations West Branch Delaware River at Walton (01423000) and Trout Creek near Trout Creek (0142400103) is approximately 352 mi2. This accounts for about 78 percent of the contributing drainage area of the Cannonsville Reservoir. The hydrograph of estimated inflow developed by combining the individual hydrographs of the West Branch Delaware River at Walton and Trout Creek near Trout Creek stream-gaging stations produced an estimated peak runoff per unit of contributing drainage area of 87 (ft3/s)/mi2. Applying this peak runoff to the entire Cannonsville Reservoir drainage area yields an estimated maximum inflow of about 39,500 ft3/s on June 28 (fig. 9B–2). The peak discharges of 28,600 ft3/s on June 28 at West Branch Delaware River at Walton (fig. 7B–6) and 4,350 ft3/s on June 27 at Trout Creek near Trout Creek were both period-of-record maximum discharges.

The water level in the Cannonsville Reservoir reached a new period-of-record maximum elevation of 1,160.08 ft on June 28, as a result of this storm (fig. 9B–2). The previous period-of-record maximum observed elevation was 1,156.79 ft recorded on April 4, 2005. The USGS stream-gaging station West Branch Delaware River at Stilesville (01425000), immediately downstream from the Cannonsville Reservoir, recorded a new period-of-record maximum discharge of 33,100 ft3/s at noon of June 28 (fig. 7B–7). This new maximum discharge is more than double the previous


0

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30,000

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DISC

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E, IN

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Estimated inflow


1,278

1,279

1,280

1,281

1,282

1,283

1,284

ELEV

ATIO

N, I

N F

EET

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E N

GVD

29

0:006/26/2006

12:00 0:006/27/2006

12:00 0:006/28/2006

12:00 0:006/29/2006

12:00 0:006/30/2006

12:00 0:007/1/2006

Spillway crestelevation = 1,280 feet

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1,164

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29

0:006/26/2006

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Spillway crestelevation = 1,150 feet

OutflowDiversions

Estimated inflow

Water-surface elevation,(estimated where dashed)

Figure 9B–1. Fifteen minute inflow, outflow, diversions and water-surface elevation at the Pepacton Reservoir, NY, June 26–30, 2006.

Figure 9B–2. Fifteen minute inflow, outflow, diversions and water-surface elevation at the Cannonsville Reservoir, NY, June 26–30, 2006.


peak-of-record maximum, since regulation, recorded on April 3, 2005. The peak outflow during the June 2006 flood was reduced by about 16 percent because of the storage effect of the reservoir. Although the Cannonsville Reservoir was full and spilling at the start of this storm, the flooding downstream would have been even greater if the reservoir had not been present.

The contents of the Cannonsville Reservoir were at varying amounts of full capacity at the start of past flooding events. Prior to the flood of January 19–20, 1996, the Cannonsville Reservoir was at 65 percent of full capacity. The water level in the Cannonsville Reservoir rose nearly 23 ft during the flood of January 1996 but did not spill as it stored floodwaters from the West Branch of the Delaware River and protected downstream communities from devastating flooding. The peak discharge of 25,000 ft3/s recorded on January 19, 1996, at the West Branch Delaware River at Walton stream-gaging station (01423000) upstream from the reservoir is the second highest peak recorded at this station. Prior to the flood of September 18–19, 2004, the Cannonsville Reservoir was at 99.6 percent of capacity. Upstream from the reservoir at the West Branch Delaware River at Walton stream-gaging station, a peak discharge of 15,200 ft3/s was recorded on September 18, 2004; downstream from the reservoir at West Branch Delaware River at Stilesville, a peak discharge of 10,200 ft3/s was recorded on September 19, 2004.

The Neversink Reservoir (fig. 4B) is along the Neversink River approximately 2 mi southeast of Neversink, NY, and

has a drainage area of 92.5 mi2. The reservoir is formed by an earth filled rockfaced dam and began storage operations on June 2, 1953. The Neversink Reservoir has a usable capacity of 34,941 Mgal between the minimum operating elevation of 1,319.0 ft and the spillway crest elevation of 1,440.0 ft. The total capacity at the spillway crest, including dead storage, is 37,146 Mgal.

The contents of the Neversink Reservoir were at about 95 percent of capacity at 7:00 a.m. on June 26, 2006. The USGS stream-gaging station Neversink River near Claryville (01435000) recorded a peak discharge of 11,500 ft3/s on the morning of June 28. The drainage area above this stream-gaging station is about 72 percent of the total contributing area to the Neversink Reservoir. The peak discharge recorded at this station per unit of contributing drainage area yields a peak runoff of 173 (ft3/s)/mi2. Applying this peak runoff to the entire Neversink Reservoir drainage yields an estimated maximum inflow of 16,000 ft3/s to the reservoir on June 28 (fig. 9B–3).

The Neversink Reservoir reached a peak elevation of 1,442.76 ft on June 28 as a result of this storm. The period-of-record maximum elevation for the Neversink Reservoir is 1,443.66 ft recorded on April 3, 2005. The USGS stream-gaging station Neversink River at Neversink (01436000), just downstream from the Neversink Reservoir, recorded a peak discharge of 7,840 ft3/s on the morning of June 28. The period-of-record maximum discharge at this station, since regulation, is 12,500 ft3/s recorded during the flood of April 2–3, 2005.

0

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29

0:006/26/2006

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12:00 0:006/29/2006

12:00 0:006/30/2006

12:00 0:007/1/2006

Spillway crest elevation = 1,440 feet

OutflowDiversions

Estimated inflow


Figure 9B–3. Fifteen minute inflow, outflow, diversions and water-surface elevation at the Neversink Reservoir, NY, June 26–30, 2006.


The peak outflow from the Neversink Reservoir on June 28 was attenuated by about 51 percent because of the storage effects of the reservoir.

The Prompton Reservoir is along the West Branch Lackawaxen River 0.3 mi north of Prompton, PA, and has a drainage area of 59.6 mi2. The reservoir is formed by an earth and rock filled dam and was completed by the U.S. Army Corps of Engineers in July 1960. The primary purpose for the construction of this reservoir was flood control, although it is also used for recreation. Regulation is accomplished through an ungated tunnel that slowly drains stored floodwaters. The usable capacity of the reservoir is about 15,732 Mgal between elevation 1,125.0 ft (conservation pool) and the spillway crest at elevation 1,205.0 ft.

The water level in the Prompton Reservoir was at an elevation of 1,124.1 ft at noon on June 25, 2006. During this storm event, the water level in the reservoir rose more than 32 ft and crested at 1,156.4 ft on June 28 at 3:00 p.m., nearly 49 ft below the spillway. The Prompton Reservoir successfully stored 4,272 Mgal of floodwaters, or 4.1 in. of runoff, during the June 2006 storm.

The General Edgar Jadwin Reservoir is along Dyberry Creek, a major tributary to the Lackawaxen River, 2.4 mi north of Honesdale, PA, and has a drainage area of 64.5 mi2. The reservoir is formed by an earth and rock filled dam and was completed by the U.S. Army Corps of Engineers in October 1959. The primary purpose for the construction of this reservoir was flood control. Regulation is accomplished through an ungated tunnel that slowly drains stored floodwaters. The usable capacity of the reservoir is about 7,983 Mgal below the spillway crest at elevation 1,053.0 ft, and there is no dead storage.

The water level in the General Edgar Jadwin Reservoir was at an elevation of 989.2 ft at noon on June 25, 2006. During the storm, the water level rose nearly 52 ft and crested at 1,040.8 ft on June 28 at 8:00 p.m., slightly more than 12 ft below the spillway. The General Edgar Jadwin Reservoir successfully stored 5,429 Mgal, or 4.8 in. of runoff, during the June 2006 storm.

Lake Wallenpaupack is along Wallenpaupack Creek (fig. 4B), a major tributary to the Lackawaxen River, at Wilsonville, PA, and has a drainage area of 228 mi2. The lake is formed by a concrete gravity-type and earth filled dam and was completed by Pennsylvania Power and Light Corporation (PPL) in November 1925. The primary purpose of the lake was hydroelectric power, although it is also used for recreation, and is operated in a manor to mitigate downstream flooding. Regulation is accomplished by 14-ft diameter roller gates affixed on top of the spillway crest at elevation 1,176.0 ft and by the intake structure for two turbines. The usable capacity of the lake is 38,000 Mgal between elevation 1,165.0 ft and the crest elevation of 1,187.0 ft (PPL Generation, LLC, and Kleinschmidt, 2002).

On June 25, 2006, the water level in Lake Wallenpaupack was at a normal operating elevation of 1,185.8 ft; by 3:30 a.m. on June 28, the water level in the lake had risen to an elevation

of 1,190.1 ft and began to spill over the top of the roller gates. On June 28, a 4-hour average peak inflow of 19,500 ft3/s was estimated and a peak outflow of 9,700 ft3/s was computed. Lake Wallenpaupack successfully stored 11,500 Mgal, or 2.9 in. of runoff, during the June 2006 storm (Gary Petrewski, Pennsylvania Power and Light Corporation, oral commun., 2008).


The East Sidney Lake (fig. 4C) is along the Ouleout Creek about 4 mi upstream from its confluence with the Susquehanna River near Unadilla, NY, and has a drainage area of 103 mi2. The Ouleout Creek is a major tributary to the Susquehanna River between Oneonta and Unadilla. East Sidney Lake is formed by a concrete dam and rock-filled dike. The primary purpose for the construction of this lake was flood control, although it is also used for recreation. While still under construction, East Sidney Lake began regulation of outflows in November 1949 and was first used for flood control on March 28, 1950. The U.S. Army Corps of Engineers completed construction of the reservoir in June 1950. Discharge is controlled by the operation of five large gates, which allow the lake to store floodwaters during storms and then release water when conditions permit. The usable capacity of the lake is about 10,934 Mgal between elevation 1,115.0 ft and the crest of the spillway at elevation 1,203.0 ft.

The water level in East Sidney Lake was at an elevation of 1,152.4 ft at 7:00 a.m. on June 26, 2006, 10 percent of capacity. The discharge at the USGS stream-gaging station Ouleout Creek at East Sidney (01500000), downstream from the lake, was less than 100 ft3/s on the morning of June 26, 2006. Releases from the lake were increased to about 1,000 ft3/s by late in the evening on June 26 in an attempt to lower the water level in the lake to allow a larger void to store floodwaters. When rainfall increased on the morning of June 27, releases from the lake were reduced, and by noon on June 27, the discharge was less than 40 ft3/s at the Ouleout Creek at East Sidney stream-gaging station. From 5:00 a.m. on June 27 to 5:00 a.m on June 29, the water level in East Sidney Lake had risen more than 50 ft, and the lake was starting to spill (fig. 9C–1). This was the first time in its 56-year history that the lake spillway had been used. The water level in East Sidney Lake reached a new period-of-record maximum elevation of 1,204.35 ft on June 30. The peak discharge at the Ouleout Creek at East Sidney stream-gaging station was 2,010 ft3/s recorded on July 1, 2006, days after flood crests along the Susquehanna River had occurred. The East Sidney Lake successfully stored 11,110 Mgal, or 6.2 in. of runoff, during the June 2006 storm.

The Otselic River is a tributary to the Tioughnioga River, which is a tributary to the Chenango River. The Chenango River is a major tributary to the Susquehanna River, whose confluence is in the City of Binghamton. Whitney Point Lake

Comparison of the 2006 Flood to Historic Floods 53

(fig. 4C) is along the Otselic River about 0.9 mi upstream from the confluence with the Tioughnioga River in Whitney Point, NY, and has a drainage area of 257 mi2. The Tioughnioga River at Lisle stream-gaging station (01509520) is upstream from the confluence, and the Tioughnioga River at Itaska stream-gaging station (01511500) is downstream from the confluence (fig. 4C). Whitney Point Lake was completed by the U.S. Army Corps of Engineers in 1942 and is formed by an earth filled dam and concrete spillway. The primary purpose for the construction of this lake was flood control, and it was first used for this purpose on March 9, 1942. Discharge is controlled by the operation of three large gates, which are used to allow the lake to store floodwaters during storms and then release them when conditions permit. The usable capacity of the lake is about 28,171 Mgal between elevation 950.0 ft and the crest of the spillway at elevation 1,010.0 ft.

The water level in Whitney Point Lake was at an elevation of 973.2 ft at 7:00 a.m. on June 26, 2006, 15 percent of capacity. Streamflow at the USGS stream-gaging station Otselic River at Cincinnatus (01510000), about 12 mi upstream from Whitney Point Lake, recorded a peak discharge of 8,100 ft3/s at 1:00 a.m. on June 28 (table 3). The water level in Whitney Point Lake began a steady rise late in the evening on June 26 and reached a maximum elevation of 999.57 ft at 9:00 a.m. on June 30. Although the water level in Whitney Point Lake had increased by more than 26 ft from June 26 to June 30, there was still an additional 10 ft of storage available before the lake would spill (fig. 9C–2). Whitney Point Lake successfully stored 18,987 Mgal, or 4.3 inches of runoff, during the June 2006 storm.

Comparison of the 2006 Flood to Historic Floods

For more than a century, the USGS has documented the effects of many floods that have devastated areas in New York and adjacent states. Although the data collected from previous floods has helped Federal, State, and local officials to develop infrastructure to withstand future flooding, a comparison of this flood with past floods gives a perspective on the magnitude of this event that is not affected by changes in costs and labor practices over time. The recorded peak water-surface elevations and discharges during the June 26–29, 2006, flood at selected USGS stream-gaging stations were compared to those of several previous floods. The floods selected for comparison differed by basin because of the diverse topography and variable weather patterns typically found in New York. New York has eight physiographic regions, excluding Long Island, and widely varied mean annual precipitation patterns (Randall, 1996) that at times can contribute to widely varied streamflow conditions. It is not uncommon in New York for one part of the state to experience a major flood, while rivers and streams in other areas remain well below the NWS flood stage.

Mohawk River Basin

In the Mohawk River basin, peak discharges from the June 2006 flood were compared to historic peaks from the floods of March 1977 and January 1996 at selected USGS stream-gaging stations (table 4A). During the March 1977 flood, the USGS stream-gaging station Mohawk River below Delta Dam near Rome (01336000) recorded a peak discharge of 640 ft3/s, which is less than the 2-year recurrence interval, but downstream at the Mohawk River at Little Falls stream-gaging station (01347000), the recorded peak discharge for the March 1977 flood was 33,100 ft3/s. During the January 1996 flood, a peak discharge of 30,700 ft3/s was recorded at the Mohawk River at Little Falls stream-gaging station. The West Canada Creek is a major tributary to the Mohawk River between Rome and Little Falls. During the 1977 and 1996 floods, the recorded peak discharges at the USGS stream-gaging station West Canada Creek at Kast Bridge (01346000) were 2,850 and 13,600 ft3/s, respectively. Farther downstream from Little Falls, two additional gaged tributaries contribute to the flow in the Mohawk River. These tributaries are the East Canada Creek and the Schoharie Creek. The USGS stream-gaging stations East Canada Creek at East Creek (01348000) and Schoharie Creek at Burtonsville (01351500) recorded peak discharges of 13,300 and 35,500 ft3/s, respectively, during the March 1977 flood and 17,000 and 81,600 ft3/s, respectively, during the January 1996 flood. The USGS stream-gaging station Mohawk River at Cohoes (01357500) , near the mouth of the Mohawk River, recorded peak discharges of 112,000 and 132,000 ft3/s during the March 1977 and January 1996 floods, respectively. Discharge hydrographs for selected historic floods at the Little Falls and Cohoes stream-gaging stations are shown in figure 10A.

During the June 2006 flood, new period-of-record maximum discharges were recorded at the Mohawk River at Little Falls and the East Canada Creek at East Creek stream-gaging stations, and although a new record maximum was not recorded at the West Canada Creek at Kast Bridge stream-gaging station, the maximum discharge did have a greater than 100-year recurrence interval (table 3). The maximum discharge for the June 2006 flood recorded at the USGS stream-gaging station Schoharie Creek at Burtonsville was 28,100 ft3/s with a recurrence interval of less than 5 years.


In the Delaware River basin, peak discharges from the June 2006 flood were compared to historic peaks from the floods of August 1955, January 1996, September 2004, and April 2005 at selected USGS stream-gaging stations (table 4B). Prior to June 2006, the August 1955 flood was considered by many to be the greatest flood that ever occurred along many reaches of the main stem of the Delaware River from Hancock, NY, to Trenton, NJ, as well as many parts of southeastern New England. The flood of August 1955 was


0

500

1,000

1,500

2,000

2,500

DATE AND TIME

DISC

HARG

E, IN

CUB

IC F

EET

PER

SECO

ND

1,140

1,150

1,160

1,170

1,180

1,190

1,200

1,210

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


OutflowWater-surface elevation

0:006/26/2006

12:00 0:006/27/2006

12:00 0:006/28/2006

12:00 0:006/29/2006

12:00 0:006/30/2006

12:00 0:007/1/2006

12:00 0:007/2/2006


0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

0:006/26/2006

12:00 0:006/27/2006

12:00 0:006/28/2006

12:00 0:006/29/2006

12:00 0:006/30/2006

12:00 0:007/1/2006

DATE AND TIME

DISC

HARG

E, IN

CUB

IC F

EET

PER

SECO

ND

970

982

988

994

1,000

1,006

1,012

1,018

Tioughnioga River at Lisle, NYTioughnioga River at Itaska, NYOtselic River at Cincinnatus, NYWater-surface elevation, Whitney Point Lake

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

976

Figure 9C–2. Fifteen minute discharges at selected stream-gaging stations upstream and downstream of Whitney Point Lake and water-surface elevation at Whitney Point Lake, NY, June 26–30, 2006.

Figure 9C–1. Fifteen minute outflow and water-surface elevation at the East Sidney Lake, NY, June 26–July 1, 2006.


0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

6/26/2006 6/27/2006 6/28/2006 6/29/2006 6/30/2006 7/1/2006 7/2/2006

DATE

DIS

CHA

RGE,

IN C

UB

IC F

EET

PER

SECO

ND

0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

6/26/2006 6/27/2006 6/28/2006 6/29/2006 6/30/2006 7/1/2006 7/2/2006

DATE

DIS

CHA

RGE,

IN C

UB

IC F

EET

PER

SECO

ND

Mohawk River at Cohoes, NY

Mohawk River near Little Falls, NY

March 12−16, 1977January 17−22, 1996June 26−July 1, 2006

March 12−17, 1977January 17−22, 1996June 26−July 1, 2006

Figure 10A. Discharge hydrographs for selected historic floods at (1) the Mohawk River near Little Falls, NY, and (2) the Mohawk River at Cohoes, NY, stream-gaging stations. (Locations shown in fig. 4A.)


fueled by two hurricanes that traveled up the east coast and over New York and southeastern New England. Hurricanes Connie and Diane hit the area about 1 week apart, and each dropped about 4 to 8 in. of rain over parts of southeastern New York. The USGS stream-gaging station Delaware River above Lackawaxen River near Barryville, NY, (01428500) has been in operation since October 1940, and prior to the June 28, 2006, peak of 151,000 ft3/s, the period-of-record maximum discharge was 130,000 ft3/s recorded during the August 1955 flood (fig. 7B-10). The period-of-record maximum discharge at the USGS stream-gaging station Delaware River at Port Jervis (01434000), in operation since October 1904, is 233,000 ft3/s, which was recorded during the August 1955 flood. The peak discharge for the June 2006 flood at the Delaware River at Port Jervis stream-gaging station was 189,000 ft3/s (fig. 7b–11). According to historic literature, the highest flood prior to the October 1903 flood which was estimated at 205,000 ft3/s at Port Jervis, was on January 8, 1841 (Grover, 1937). The Lackawaxen and Mongaup Rivers and Shohola Creek are the larger tributaries between the near Barryville and Port Jervis stream-gaging stations, and the Lackawaxen River accounts for 57 percent of the increase in drainage area between the two stream-gaging stations. During the August 1955 flood, the peak discharge at the USGS stream-gaging station Lackawaxen River near Hawley, PA, (01431500) was 51,900 ft3/s, and during the June 2006 flood, the peak discharge was 28,000 ft3/s. Inflow during the August 1955 flood, to the Delaware River between Barryville and Port Jervis can be estimated to be about 100,000 ft3/s, but during the June 2006 flood, the inflow was probably less than 40,000 ft3/s. The large difference in inflow to the Delaware River between Barryville and Port Jervis during the August 1955 flood and the June 2006 flood is mostly attributable to precipitation and runoff amounts and patterns but is also partly attributable to the effects of Prompton Reservoir, General Edgar Jadwin Reservoir, and Lake Wallenpaupack on flood flows in the Lackawaxen River basin. Discharge hydrographs

for the August 1955 and June 2006 floods at selected sites along the main stem of the Delaware River are shown in figure 10B.

Upstream from the confluence of the East and West Branches of the Delaware River in Hancock, recorded peak flows during the January 1996, September 2004, and April 2005 floods exceeded the August 1955 flood at several USGS stream-gaging stations (table 4b). The Pepacton Reservoir is along the East Branch of the Delaware River just upstream from Downsville. The Pepacton Reservoir began storage operations on September 15, 1954. During the August 1955 flood, the USGS stream-gaging station East Branch Delaware River at Margaretville (01413500), upstream from the Pepacton Reservoir, recorded a peak discharge of 9,990 ft3/s flowing into the reservoir. The Pepacton Reservoir, which was at 39 percent of capacity on August 1, 1955, stored all the runoff from the upstream contributing drainage area and as a result, the peak discharge recorded at the USGS stream-gaging station East Branch Delaware River at Downsville (01417000), immediately downstream from the Pepacton Reservoir, was only 620 ft3/s during the August 1955 flood. On September 1, 1955, the water-level in the Pepacton Reservoir had reached and elevation of about 1,159.6 ft (fig. 11), and was at just over 50 percent of capacity after storing runoff from the back-to-back hurricanes that struck the region from August 11 to 20, 1955 (Bogart, 1960) During the January 1996 flood the water level in the Pepacton Reservoir rose nearly 20 ft with an estimated inflow of greater than 50,000 ft3/s.On June 28, 2006, the water level in the Pepacton Reservoir reached a new period-of-record maximum elevation of 1,283.74 ft Prior to the construction of the Pepacton Reservoir, the period-of-record maximum discharge at USGS stream-gaging station East Branch Delaware River at Downsville was 23,900 ft3/s, recorded on November 26, 1950. Farther downstream at the USGS stream-gaging station East Branch Delaware River at Fishs Eddy (01421000), a peak discharge of 27,400 ft3/s was recorded during the August 1955 flood.

Table 4A. Peak elevations and peak discharges for selected historical floods and the June 26–29, 2006, flood at selected U.S. Geological Survey stream-gaging stations in the Mohawk River basin, NY.

[mi2, square miles; -- , no data available]

Station number

Station name

Drainage area (mi2)

Peak elevations, in feet above NGVD 29; peak discharges, in cubic feet per second

March 1977 January 1996 June 2006

01336000 Mohawk River below Delta Dam, near Rome, NY 152 476.05; 640 476.27; 804 479.73; 3,100

01346000 West Canada Creek at Kast Bridge, NY 560 442.73; 2,850 445.81; 13,600 447.28; 21,800

01347000 Mohawk River near Little Falls, NY 1,342 328.01; 33,100 327.31; 30,700 328.56; 35,000

01348000 East Canada Creek at East Creek, NY 289 343.12; 13,300 344.02; 17,000 346.69; 31,500

01349150 Canajoharie Creek near Canajoharie, NY 59.7 -- -- 648.51; 3,280 650.50; 5,510

01351500 Schoharie Creek at Burtonsville, NY 886 515.87; 35,500 520.86; 81,600 514.95; 28,100

01357500 Mohawk River at Cohoes, NY 3,450 70.89; 112,000 71.81; 132,000 69.83; 96,400


Subsequent to the flood of August 1955, the floods of September 2004 and April 2005 were close in magnitude along the East Branch of the Delaware River from Downsville to Fishs Eddy. Peak discharges of 20,200 and 19,400 ft3/s were recorded at the Downsville stream-gaging station during the floods of 2004 and 2005, respectively, and 56,300 and 65,100 ft3/s were recorded at the Fishs Eddy stream-gaging station during the floods of 2004 and 2005, respectively. The recorded peak discharge for the June 2006 flood, 77,400 ft3/s, was a new period-of-record maximum for the USGS stream-gaging station East Branch Delaware River at Fishs Eddy since the stream-gaging station was put into operation in October 1912 ( fig. 7B–5).

Along the West Branch of the Delaware River, the August 1955 flood produced peak discharges of 15,100 ft3/s at the Walton stream-gaging station (01423000) and 16,000 ft3/s downstream at the Hale Eddy stream-gaging station (01426500). The Cannonsville Reservoir was constructed and began operations on September 30, 1963. Prior to the June 2006 flood, the period-of-record maximum discharge at the USGS stream-gaging station West Branch Delaware River at Walton was 25,000 ft3/s recorded on January 19, 1996. The Cannonsville Reservoir was at 65 percent of capacity prior to the January 1996 flood. The peak inflow to the Cannonsville Reservoir was computed to be about 35,000 ft3/s on January 19, 1996 (Lumia, 1998). The

peak discharge recorded at the USGS stream-gaging station West Branch Delaware River at Stilesville (01425000), about 1.8 mi downstream from the Cannonsville Reservoir, during the January 1996 flood was 112 ft3/s. The water level in the reservoir rose nearly 23 ft from January 18 to 23, 4.0 in. of runoff was stored during this period, and the reservoir began to spill on January 25. The Catskill Mountain part of the New York City reservoir system (includes all six New York City reservoirs in the Catskill Mountians) stored about 95.5 billion gallons of floodwaters during January 18–23, 1996 (Lumia, 1998). Peak discharges of 15,200 and 17,500 ft3/s were recorded at the Walton and Hale Eddy stream-gaging stations during the flood of September 2004. Peak discharges of 18,400 and 21,500 ft3/s were recorded at the Walton and Hale Eddy stream-gaging stations during the flood of April 2005, whereas period-of-record peak discharges of 28,600 and 43,400 ft3/s were recorded during the flood of June 2006 (figs. 7B–6, 7B–8).

The June 2006 flood is the greatest flood since the flood of October 1903 along the lower reach of the East Branch Delaware River from East Branch to Hancock, along the middle and lower reaches of the West Branch Delaware River from Walton to Hancock, and along the main stem Delaware River from Hancock to the confluence with the Lackawaxen River.

100

1,000

10,000

100,000

1,000,000

6/24/2006 6/25/2006 6/26/2006 6/27/2006 6/28/2006 6/29/2006 6/30/2006 7/1/2006

DATE

DIS

CHA

RGE,

IN C

UB

IC F

EET

PER

SECO

ND

Delaware River above Lackawaxen River near Barryville, NY, June 2006

Delaware River at Port Jervis, NY, June 2006

Delaware River above Lackawaxen River near Barryville, NY, August 1955

01431500 Lackawaxen River at Hawley, PA, August 1955

Delaware River at Port Jervis, NY, August 1955

01431500 Lackawaxen River at Hawley, PA, June 2006

Figure 10B. Discharge hydrographs for selected stream-gaging stations in the Delaware River basin, NY, for the June 2006 and August 1955 floods. (Locations shown in fig. 4B.)


ble

4B.

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Stat

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tion

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Peak

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bove

NG

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eak

disc

harg

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feet

per

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Aug

ust

1955

Janu

ary

19

96Se

ptem

ber

2004

Apr

il

2005

June

20

06

0141

3500

East

Bra

nch

Del

awar

e R

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at M

arga

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ille,

NY

163

1,31

3.47

;

9,9

901,

317.

26;

25

,800

1,31

5.04

; 1

3,90

01,

315.

22;

14,

700

1,31

4.98

; 1

3,60

0

0141

7000

East

Bra

nch

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iver

at D

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ville

, NY

372

1,09

8.72

;

6

201,

099.

87;

2

,580

1,10

7.00

; 2

0,20

01,

106.

82;

19,

400

1,10

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; 2

0,00

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0141

7500

East

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nch

Del

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at H

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.40;

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1,02

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; 2

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1,02

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, NY

241

1,16

3.14

;

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; 4

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50,

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1,17

2.25

; 6

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0

0142

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East

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84;

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1,20

6.66

;

25,0

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71;

15,

200

1,20

4.75

; 1

8,40

01,

207.

15;

28,

600

0142

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Wes

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Del

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, NY

456

d 1,0

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;

1

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10,

200

1,00

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; 1

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01,

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95;

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Wes

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, NY

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959.

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957.

97;

13

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959.

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17,

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960.

58;

21,

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Del

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1,82

0--

--

751.

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95

,600

752.

21;

107,

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752.

86;

114,

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26;

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0142

8500

Del

awar

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2,02

062

6.62

; 1

30,0

0062

2.40

;

98,3

0062

4.31

; 11

2,00

062

5.02

; 11

8,00

062

9.19

; 15

1,00

0

0143

1500

Lack

awax

en R

iver

at H

awle

y, P

A29

089

3.80

;

51,9

0088

0.54

;

12,7

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3.49

; 1

7,70

088

4.24

; 1

9,60

088

7.19

; 2

8,00

0

0143

4000

Del

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at P

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s, N

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26;

233

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433.

72;

134

,000

434.

87;

151,

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435.

87;

166,

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436.

82;

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nk R

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, NY

307

472.

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468.

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8

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467.

88;

6

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Peak Water-Surface Elevations at Flood Study Sites 59


In the Susquehanna River basin, peak discharges from the June 2006 flood were compared to historic peaks from the floods of March 1936, June 1972, and April 2005 at selected USGS stream-gaging stations (table 4C). At the time, the March 1936 flood was the greatest flood of record in the upper reaches of the Susquehanna River basin (upstream from Waverly, NY), except for part of the Chemung River basin that was hit even harder by the flood of July 1935 (Grover, 1937). The June 1972 flood that resulted from heavy rains brought on by remnants of Hurricane Agnes produced record flooding along the Chemung River and throughout the Susquehanna River basin downstream from Waverly. Hurricane Agnes delivered more than 19 in. of rain from June 19–24, 1972, as it moved from the Gulf of Mexico across Florida, then up the east coast through New York, into Canada, and finally out to sea. Although many long-standing flood records were exceeded in six states and 122 people were killed as a result of this storm (National Oceanic and Atmospheric Administration, 2002), peak discharges recorded during the July 1935 and March 1936 floods remained greater than those of the June 1972 storm at many locations upstream from Waverly, along the Susquehanna, Chenango, and Tioughnioga Rivers. Discharge hydrographs for selected USGS stream–gaging stations in the Susquehanna River basin for the March 1936, June 1972, and June 2006 floods are shown in figure 10C. The peak discharge at the USGS stream-gaging station Susquehanna River at Unadilla (01500500) was estimated to be about 31,300 ft3/s during the March 1936 flood. Peak discharges recorded along the Chenango River at the Sherburne (01505000) and Chenango Forks (01512500) stream-gaging stations were 12,500 (estimated) and 50,100 ft3/s, respectively (table 4C). The USGS stream-gaging stations on the Susquehanna River at Conkin (01503000) and at Vestal (01513500) recorded peak discharges of 61,600 and 107,000 ft3/s (estimated), respectively, during the March 1936 flood, and 26,500 and 50,400 ft3/s, respectively, during the June 1972 flood (figs. 7C–3, 7C–8). Several new period-of-record maximum discharges were recorded in the Susuquehanna River basin as a result of the June 2006 flood. The USGS stream-gaging stations Susquehanna River at Unadilla, at Conklin, and at Vestal recorded new period-of-record maximum discharges of 35,100 ft3/s, 76,800, and 119,000 respectively, during the June 2006 flood. The Susquehanna River near Waverly, NY(01515000), stream-gaging station is 1 mi downstream from the New York-Pennsylvania state line and has been in operation since February 1937. An estimated peak discharge, outside the period of record, of 128,000 ft3/s was determined from flood profiles for the March 1936 flood. Coincidentally, a peak discharge of 128,000 ft3/s was recorded on June 28, 2006, and is considered the new period-of-record maximum for the Susquehanna River near Waverly stream-gaging station.

Peak Water-Surface Elevations at Flood Study Sites

Measurements of peak water-surface elevations were made at 104 sites along the Mohawk, Delaware, and Susquehanna Rivers. The study area in the Mohawk River basin includes study sites on the West and East Canada Creeks and along the Mohawk River from below Delta Dam near Rome east to Erie Canal Lock 9 at Rotterdam Junction (fig. 12A).

In the Delaware River basin, study sites were identified on tributaries to the East Branch Delaware River, which included the Little Beaver Kill, Willowemoc Creek, and Beaver Kill. Study sites also were selected along the East Branch Delaware River from Harvard to the confluence of the East and West Branches of the Delaware River near Hancock. Along the West Branch Delaware River, study sites were selected at points upstream from the Cannonsville Reservoir near Delhi to the confluence of the East and West Branches of the Delaware River below the Cannonsville Reservoir near Hancock. Study sites were not selected upstream from the Pepacton Reservoir along the East Branch Delaware River because several USGS stream-gaging stations in this area generally indicated peak discharges had recurrence intervals of 15 years or less. Study sites also were selected along the main stem of the Delaware River from Hancock to Port Jervis and along Callicoon Creek, a tributary to the Delaware River (fig. 12B).

In the Susquehanna River basin, study sites were selected along the Susquehanna River from Cooperstown, NY, downstream to Athens, PA. Sites also were selected along tributaries to the Susquehanna River, which included the Unadilla, the Tioughnioga, and the Chenango Rivers. Although these areas were devastated by floods in the past, major flooding was not identified during June 27–29, 2006, along the Chemung River; therefore, study sites were not selected along this major tributary to the Susquehanna River (fig. 12C).

High-water marks at each site were flagged and surveyed to obtain peak water-surface elevations, and were referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29). A data correction value used to convert elevations from NGVD 29 to North American Vertical Datum of 1988 (NAVD 88) at each site was calculated by using the National Geodetic Survey (NGS) North American Vertical Datum Conversion (VERTCON) Utility (National Oceanic and Atmospheric Administration, 2006d). At sites associated with a bridge, high-water marks were obtained upstream and downstream from the structure when possible.

The accuracy of high-water marks was rated subjectively by field personnel as “excellent,” “good,” “fair,” or “poor,” according to the guidelines of Benson and Dalrymple (1967). “Excellent” means the reported high-water mark is considered within 0.02 ft of the true high-water elevation, “good” within 0.05 ft and “fair” within 0.10 ft; “poor” implies less than “fair”


0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

6/24/2006 6/25/2006 6/26/2006 6/27/2006 6/28/2006 6/29/2006 6/30/2006 7/1/2006

Susquehanna River near Waverly, NY

June 24−July 3, 2006

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

90,000Susquehanna River at Conklin, NY

March 16−23, 1936

7/4/20067/3/20067/2/2006

June 21−27, 1972

June 24−July 3, 2006

6/24/2006 6/25/2006 6/26/2006 6/27/2006 6/28/2006 6/29/2006 6/30/2006 7/1/2006 7/4/20067/3/20067/2/2006

DATE

DATE

DIS

CHA

RGE,

IN C

UB

IC F

EET

PER

SECO

ND

DIS

CHA

RGE,

IN C

UB

IC F

EET

PER

SECO

ND

Figure 10C. Discharge hydrographs for selected historic floods at (1) the Susquehanna River near Waverly, NY, and (2) the Susquehanna River at Conklin, NY, stream-gaging stations. (Locations shown in fig. 4C.)

Peak Water-Surface Elevations at Flood Study Sites 61Ta

ble

4C.

Peak

ele

vatio

ns a

nd p

eak

disc

harg

es fo

r sel

ecte

d hi

stor

ical

floo

ds a

nd th

e Ju

ne 2

6-29

, 200

6, fl

ood

at s

elec

ted

U.S.

Geo

logi

cal S

urve

y st

ream

-gag

ing

stat

ions

in th

e Su

sque

hann

a Ri

ver b

asin

, NY.

[mi2 ,

squa

re m

iles;

-- ,

no d

ata

avai

labl

e]

Stat

ion

nu

mbe

r S

tatio

n

nam

e

Dra

inag

e

area

(m

i2 )

Peak

ele

vatio

ns, i

n fe

et a

bove

NG

VD 2

9;

peak

dis

char

ges,

in c

ubic

feet

per

sec

ond

Mar

ch 1

936

June

197

2A

pril

2005

June

200

6

0150

0500

Susq

ueha

nna

Riv

er a

t Una

dilla

, NY

982

1,01

3.85

;

a 31,

300

1,00

5.12

;

6,1

401,

010.

93;

20

,500

1,01

4.97

;

35,1

00

0150

2500

Una

dilla

Riv

er a

t Roc

kdal

e, N

Y52

0--

--

1,00

0.98

;

6,6

401,

004.

08;

13

,900

1,00

6.21

;

23,1

00

0150

3000

Susq

ueha

nna

Riv

er a

t Con

klin

, NY

2,23

286

1.18

;

61,

600

853.

93;

26

,500

859.

12;

49

,400

866.

06;

76

,800

0150

5000

Che

nang

o R

iver

at S

herb

urne

, NY

263

1,04

7.76

;

a 12,

500

1,04

6.73

;

7,5

001,

047.

94;

9

,330

1,04

8.51

;

11,4

00

0150

7000

Che

nang

o R

iver

at G

reen

e, N

Y59

3--

--

9

07.0

8;

12,

000

91

1.25

;

20,8

0091

3.74

;

27,1

00

0150

9000

Tiou

ghni

oga

Riv

er a

t Cor

tland

, NY

292

--

--

1,09

5.39

;

7,7

301,

098.

99;

14

,200

1,09

5.87

;

7,6

20

0151

0000

Ots

elic

Riv

er a

t Cin

cinn

atus

, NY

147

--

--

1,04

1.06

;

5,5

301,

042.

22;

12

,200

1,04

1.26

;

8,1

00

0151

1500

Tiou

ghni

oga

Riv

er a

t Ita

ska,

NY

730

929.

88;

2

8,70

092

6.35

;

11,5

0092

8.40

;

19,3

0092

6.61

;

12,4

00

0151

2500

Che

nang

o R

iver

nea

r Che

nang

o Fo

rks,

NY

1,48

388

6.89

;

50,

100

882.

82;

26

,200

88

5.97

;

45,4

0088

5.37

;

41,5

00

0151

3500

Susq

ueha

nna

Riv

er a

t Ves

tal,

NY

3,94

182

9.69

; a 1

07,0

0082

1.54

;

50,4

0082

8.33

;

97,0

0083

2.85

; 1

19,0

00

0151

4000

Ow

ego

Cre

ek n

ear O

weg

o, N

Y18

582

9.82

;

12,

200

829.

97;

10

,600

828.

36;

7

,150

829.

07;

8

,320

0151

5000

Susq

ueha

nna

Riv

er n

ear W

aver

ly, N

Y4,

773

765.

36;

a 128

,000

65.2

0;

121,

000

764.

84;

105

,000

766.

48;

128

,000

a Est

imat

ed.


1,130

1,135

1,140

1,145

1,150

1,155

1,160

1,165

1,170

1,175

1,180

8/1/1955 8/11/1955 8/21/1955 8/31/1955 9/10/1955 9/20/1955 9/30/1955 10/10/1955 10/20/1955 10/30/1955

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD2

9

DATE


1,260

1,264

1,268

1,272

1,276

1,280

1,284

1/24/1996 1/25/1996 1/26/1996 1/27/1996 1/28/1996 1/29/1996 1/30/1996 1/31/1996

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD2

9

DATE


1,276

1,278

1,280

1,282

1,284

1,286

6/26/2006 6/27/2006 6/28/2006 6/29/2006 6/30/2006 7/1/2006

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD2

9

DATE


1955

1996

2006

Figure 11. Water-surface elevation in the Pepacton Reservoir, NY, during August-October 1955, January 1996, and June 2006.


West Canada Creek

HinckleyReservoirDelta

Reservoir

Mohawk

River

Schoharie Creek

Cobleskill Creek

East

Cana

da C

reek

9

8

7

654

321

222120

1817

1615

1312

1110

1914

3658

169

10

30A

30

28

51

90

90

Hamilton

Lewis

Oneida

Delaware

Herkimer

Otsego

Warren

Ulster

Greene

Saratoga

Fulton

Albany Rens

sela

er

Essex

Schoharie

Chenango

Madison

Sullivan

Broome

Dutchess

Columbia

Montgomery

Schenectady

Was

hing

ton

Jefferson

Rome

Utica

Poland

Cohoes

Albany

RotterdamJunction

Oneonta

Newport

Herkimer

Schoharie

Amsterdam

Fort Plain

Dolgeville

TribesHill

Middleville

Fultonville

Canajoharie

Little Falls

Emmonsburg

Gilboa

Jacksonburg

NEW YORK

Frankfort

East Creek

Cranesville

73°45'75°

43°45'

42°30'



Road and number

High-water-mark site and number

Town or city

51

15

15

0 30 KILOMETERS15

30 MILES0

Figure 12A. Locations of 22 high-water-mark sites chosen for study in the Mohawk River basin, NY, for the flood of June 26–29, 2006. (Site numbers and flood data listed in table 5A.)


PENNSYLVANIA

NEW JERSEY

NEW YORK

Neversink Ri ver

Wal

lenp

aupa

ck C

r.

Dyberry Creek


axen RiverPromptonReservoir


Shoh

ola C

r.

206

28

10

97

52

17

97

30

5542

17B

17

590

652

191

84

Hazel

Delhi

Roscoe

Horton

Hamden

Walton

Sidney

Hancock

DepositStilesville

Morsston

Beerston

Downsville

Harvard

Pond Eddy

Peakville

Lordville

Cochecton

Narrowsburg

Hortonville

Falls Mills

PortJervis

SparrowBush

Minisink Ford

Margaretville

Skinners Falls

ButternutGrove

CallicoonCenter

Livingston Manor

RocklandFishsEddy

East BranchHale Eddy

Callicoon

De Lancey

Hawleys

E. Bra nc

h C

allico

on Cr.

6665

64

6362

61

60

59

58

57

5655

54

53

52

51

5049

48

47

4645

4443

42

41

4039 38

36

3433

31

27 2625

37 3532

30

2928

2423

Delaware

Pike

Wayne

Sullivan

Ulster

Orange

Chenango

Sussex

Otsego

Lackawanna

Broome

Susquehanna

Monroe

Schoharie

Greene

LuzernePassaic

75°42°30'

41°15'

CannonsvilleReservoir

PepactonReservoir

Beaver Kill

D e l a w a r e R i v e r

NeversinkReservoir

SchoharieReservoir

Lake

LakeWallenpaupack

Middle Creek

Half w

ay Brook

Mongaup RiverLackawaxen River


N. B

ranch Cal

licoo

n C

r.

East Branch D

elaware River


rWillowem o c

Cree

k

10

0 20 KILOMETERS10

20 MILES0

LittleBeaverKill


Road and number


Town or city

97

46

Barryville

Figure 12B. Locations of 44 high-water-mark sites chosen for study in the Delaware River basin, NY, for the flood of June 26–29, 2006. (Site numbers and flood data listed in table 5B.)


Oneida

Delaware

Otsego

Wayne

Sullivan

Oswego

Tioga

Broome

Herkimer

Cayuga

Chenango

Pike

Bradford

Madison

Onondaga

Susquehanna

Cortland

Tompkins

Wyoming

Sullivan

Hamilton

Fulton

Luzerne

Orange

Ulster

Lewis

Lackawanna

Scho

harie

Montgomery

Sussex

Greene

Lycoming

Schu

yler

Chem

ung

Whitney Point Lake East Sidney

Lake

Otselic

River

Tioughnioga River

Chenango River

Ouleout C r.

Susquehanna R i v e r

Unadi

lla R

iver

Owego

Otego

Sidney

Afton

AthensSayre

Oxford

Greene

ChenangoForks

Windsor

Oneonta

Norwich

Milford

Colliersville

Earlville

Nineveh

PittsfieldNew Berlin

Great BendSusquehannaDepot

Cooperstown

ConklinNichols

Unadilla

Dickinson

Butternuts

RockdaleBrisben

Binghamton

Bainbridge

JohnsonCity

UnadillaForks

SouthNew Berlin

Vestal

Campville

8

96B

206

8

205

12

17

23

23

206

20

28

79

13

13

23

267220

12B

88

99

9897 96

95

94 93

92

9190

89 88

87

8685

84

83

82

81

80

79

7877

7675

74

73

72

71

70

69

68

67

104103

102101

100

43¡

41¡50'


PENNSYLVANIA

NEW JERSEY

NEW YORK

15

0 30 KILOMETERS15

30 MILES0

75°76°10'


Road and number


Town or city

23

83

Figure 12C. Locations of 38 high-water-mark sites chosen for study in the Susquehanna River basin, NY, for the flood of June 26–29, 2006. (Site numbers and flood data listed in table 5C.)


accuracy. The high-water-mark description, photographs, location (latitude and longitude), and location with respect to a nearby bridge or other structure were documented and are presented in appendix 1. High-water-mark locations described as “left bank” or “right bank” are in relation to an observer facing downstream.

Peak water-surface elevations for the June 2006 flood were compared with flood-profile elevations published in FEMA flood-insurance studies (Federal Emergency Management Agency; 1976a–c, 1977, 1978a–b, 1979a–c, 1980a–b, 1981a–d, 1982a–f, 1983a–b, 1984a–b, 1985, 1986a–b, 1987a–g, 1988, 1990a–b, 1991a-b, 1992a–c, 1993a–c, 1997, 1998a-b, 1999a–c, 2000, 2001a–b, 2002a–d). Peak water-surface elevations and published FEMA 10-, 50-, 100-, and 500-year flood elevations are compiled in table 5. Flood elevations at 10-, 50-, 100-, and 500-year recurrence intervals and those determined for the flood of June 26–29, 2006, for selected sites in the Mohawk, Delaware, and Susquehanna River basins are plotted in figure 13.

FEMA flood-insurance studies are not available for all the communities studied along the West Canada Creek. The 100-year elevation was available for the communities of Poland and Newport (sites 1–3). The peak water-surface elevations for sites 1 and 2 were above the 100-year flood-profile elevation, and the peak water-surface elevation at site 3 was just below the 100-year flood-profile elevation. A FEMA flood-insurance study is available for the community of Dolgeville (site 6) along the East Canada Creek. Peak water-surface elevations upstream from State Route 29 in Dolgeville were between the 50- and 100-year flood-profile elevations, and the peak water-surface elevation downstream from the Route 29 bridge was between the 100- and 500-year flood-profile elevations. FEMA flood-insurance studies were available for most of the communities along the Mohawk River from Rome (site 8) to Rotterdam Junction (site 22). Peak water-surface elevations from Rome to Little Falls (site 12) were at or below the 10-year flood-profile elevation. Peak water-surface elevations at Lock 17 in Little Falls (site 13) and at Fort Plain (site 15) were generally between the 100- and 500-year flood-profile elevations, but peak water-surface elevations at Lock 15 at Fort Plain (site 14), at Canajoharie (site 16), and at Fonda/Fultonville (site 17) were all higher than the 500-year flood-profile elevations. Peak water-surface elevations from Amsterdam (site 19) to Rotterdam Junction (site 22) were generally between the 10- and 50-year flood-profile elevations.

FEMA flood-insurance studies were available for most study sites along the Little Beaver Kill, the Willowemoc, and the Beaver Kill. Peak water-surface elevations along the Little Beaver Kill from Morriston (site 23) to Livingston Manor (site 25) were generally at the 500-year flood-profile elevations. Along the Willowemoc Creek from its confluence with the Little Beaver Kill in Livingston Manor (site 27) downstream to Roscoe ( site 30), the peak water-surface elevations range from higher than the 500-year flood profile down to about equal to or just below the 50-year flood-profile

elevations, respectively. There were only limited FEMA flood-insurance studies available along the Beaver Kill from Rockland (site 31) to Peakville (site 35). Peak water-surface elevations range from slightly lower than the 100-year flood-profile elevation in the upper reach to slightly higher than the 50-year flood-profile elevation at Peakville.

Peak water-surface elevations were compared to FEMA flood-insurance study elevations for sites along the East Branch Delaware River (fig. 12b) below the Pepacton Reservoir in Harvard (site 36) to the confluence with the West Branch Delaware River in Hancock (site 40). Peak water-surface elevations were at the 10-year flood-profile elevation in Harvard and at East Branch (site 37) but generally increased to about the 50-year flood-profile elevations, from Fishs Eddy (site 38) to Hancock. FEMA flood-insurance studies are not available for all study sites along the West Branch Delaware River. Peak water-surface elevations were between the 10- and 50-year flood-profile elevations in the community of Delhi (site 41) and generally at the 100-year flood-profile elevation in the community of Walton (sites 45 and 46). Downstream from the Cannonsville Reservoir from Deposit (site 48) to Hale Eddy (site 50), the peak water-surface elevations were higher than the 500-year flood-profile elevations, and at Hancock (site 51) were at the 100-year profile. FEMA flood-insurance studies are not available for all study sites along Callicoon Creek. Along Callicoon Creek from Hortonville (site 54) to Callicoon (site 56), the peak water-surface elevations were between the 100- and 500-year flood-profile elevations. Along the main stem of the Delaware River from Lordville (site 57) to Port Jervis (site 66), the peak water-surface elevations were generally between the 100- and 500-year flood-profile elevations. Comparisons of peak water-surface elevations at selected study sites in the Delaware River basin between the September 2004 and the June 2006 floods are shown in appendix 2.

FEMA flood-insurance studies were only available for limited study sites along the Unadilla and Tioughnioga Rivers. Peak water-surface elevations along the Unadilla River at Rockdale (site70) and near Unadilla (site 71) were higher than the 500-year flood-profile elevations. Along the Tioughnioga River at the USGS stream-gaging station at Cortland (01509000), the peak water-surface elevation was slightly lower than the 10-year flood-profile elevation and 2.8 ft lower than the 100-year flood-profile elevation; at Chenango Forks (site 72), the peak water-surface elevation is 3.3 ft lower than the 100-year flood-profile elevation (100-year flood profile was the only available profile in this area). FEMA flood-insurance studies were available for most study sites along the Chenango River. The Chenango River is a major tributary that joins the Susquehanna River in the City of Binghamton. The peak discharge at the Chenango River at Sherburne stream-gaging station (01505000) had a recurrence interval of about 60 years. The peak water-surface elevation at the Chenango River at Route 32A in Norwich (site74) was between the 10- and 50-year flood-profile elevations. Downstream at Brisben (site 76), the peak water-surface elevation was


ble

5A.

Peak

wat

er-s

urfa

ce e

leva

tions

at 2

2 hi

gh-w

ater

-mar

k si

tes

and

5 U.

S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

the

Moh

awk

Rive

r bas

in, N

Y, d

urin

g th

e flo

od o

f Ju

ne 2

6–29

, 200

6, a

nd c

orre

spon

ding

floo

d el

evat

ions

for 1

0-, 5

0-, 1

00-,

and

500-

year

floo

d-re

curr

ence

inte

rval

s.

[Rec

urre

nce-

inte

rval

ele

vatio

ns a

re fr

om th

e Fe

dera

l Em

erge

ncy

Man

agem

ent A

genc

y (F

EMA

, 197

9a; 1

982b

, c, d

, e, f

; 198

3b; 1

984b

; 198

7d; 1

991a

; 199

8b; 1

999a

, b; 2

001a

; 200

2b, c

). --

, no

data

ava

ilabl

e.

Loca

tions

are

show

n in

figu

res 4

a an

d 12

a. S

ite d

escr

iptio

ns a

re g

iven

in a

ppen

dix

1.]

Site

nu

mbe

r or

st

atio

n nu

mbe

r

Sele

cted

hi

gh-w

ater

m

ark

Site

nam

e

or

stat

ion

nam

e

Peak

w

ater

-sur

face

el

evat

ion,

in

feet

ab

ove

NG

VD 2

9,

June

26-

29, 2

006

FEM

A fl

ood

elev

atio

ns, i

n fe

et a

bove

NG

VD 2

9

10-y

ear fl

ood

50-y

ear fl

ood

100-

year

floo

d50

0-ye

ar fl

ood

11.

1W

est C

anad

a C

reek

at S

tate

Rou

te 2

8 (C

reek

Roa

d) a

t Pol

and,

NY

a 702

.44

----

702.

0--

22.

1W

est C

anad

a C

reek

at C

ount

y R

oute

200

(Old

Sta

te R

oad)

at

Pola

nd, N

Yb 6

89.7

5--

--68

6.2

--

33.

13.

2W

est C

anad

a C

reek

at C

ount

y R

oute

200

(Brid

ge S

treet

) at N

ew-

port,

NY

a 648

.16

b 635

.86

-- ---- --

649.

0--

44.

14.

2W

est C

anad

a C

reek

at S

tate

Rou

te 2

8 (B

ridge

Stre

et) a

t Mid

-dl

evill

e, N

Ya 5

70.1

7b 5

66.5

7-- --

-- ---- --

-- --01

3460

00W

est C

anad

a C

reek

at K

ast B

ridge

, NY

447.

28--

----

--5

5.1

5.2

East

Can

ada

Cre

ek a

t Cou

nty

Rou

te 1

04 a

t Em

mon

sbur

g, N

Ya9

98.1

8b9

96.3

8-- --

-- ---- --

-- --6

6.1

6.2

East

Can

ada

Cre

ek a

t Sta

te R

oute

29

(Sta

te S

treet

) at D

olge

ville

, N

Ya 7

96.9

6b 7

92.0

779

4.5

790.

179

6.7

791.

179

7.6

791.

580

0.5

792.

601

3480

00Ea

st C

anad

a C

reek

at E

ast C

reek

, NY

346.

69--

----

--7

7.1

7.4

East

Can

ada

Cre

ek a

t Sta

te R

oute

5 a

t Eas

t Cre

ek, N

Ya 3

29.7

5b 3

28.1

9-- --

-- ---- --

-- --01

3360

00M

ohaw

k R

iver

bel

ow D

elta

Dam

, nea

r Rom

e, N

Y47

9.73

481.

648

3.2

483.

948

5.2

88.

1M

ohaw

k R

iver

at H

arbo

r Way

at R

ome,

NY

b 422

.05

424.

942

5.8

426.

342

7.3

99.

1M

ohaw

k R

iver

at M

arin

a D

rive

at F

rank

fort,

NY

388.

6139

3.5

395.

239

5.9

397.

410

10.1

Moh

awk

Riv

er a

t Sta

te R

oute

28

(Moh

awk

Stre

et) a

t Her

kim

er,

NY

a 387

.81

391.

639

3.6

394.

139

5.4

1111

.1M

ohaw

k R

iver

at E

rie C

anal

Loc

k 18

at J

acks

onbu

rg, N

Y37

3.49

----

----

1212

.1M

ohaw

k R

iver

at S

outh

ern

Aven

ue a

t Litt

le F

alls

, NY

371.

1037

1.3

372.

637

3.3

374.

313

13.1

Moh

awk

Riv

er a

t Erie

Can

al L

ock

17 a

t Litt

le F

alls

, NY

332.

1032

8.1

330.

133

1.2

332.

701

3470

00M

ohaw

k R

iver

nea

r Litt

le F

alls

, NY

328.

56--

----

--14

14.1

Moh

awk

Riv

er a

t Erie

Can

al L

ock

15 a

t For

t Pla

in, N

Y31

2.26

301.

630

5.4

306.

730

9.4

1515

.115

.215

.3

Moh

awk

Riv

er a

t For

t Pla

in, N

Y30

8.46

308.

5530

8.45

301.

530

1.8

300.

2

305.

330

5.1

304.

0

306.

630

6.2

305.

1

309.

230

9.6

307.

6


ble

5A.

Peak

wat

er-s

urfa

ce e

leva

tions

at 2

2 hi

gh-w

ater

-mar

k si

tes

and

5 U.

S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

the

Moh

awk

Rive

r bas

in, N

Y, d

urin

g th

e flo

od o

f Ju

ne 2

6–29

, 200

6, a

nd c

orre

spon

ding

floo

d el

evat

ions

for 1

0-, 5

0-, 1

00-,

and

500-

year

floo

d-re

curr

ence

inte

rval

s.

[Rec

urre

nce-

inte

rval

ele

vatio

ns a

re fr

om th

e Fe

dera

l Em

erge

ncy

Man

agem

ent A

genc

y (F

EMA

, 197

9a; 1

982b

, c, d

, e, f

; 198

3b; 1

984b

; 198

7d; 1

991a

; 199

8b; 1

999a

, b; 2

001a

; 200

2b, c

). --

, no

data

ava

ilabl

e.

Loca

tions

are

show

n in

figu

res 4

a an

d 12

a. S

ite d

escr

iptio

ns a

re g

iven

in a

ppen

dix

1.]

Site

nu

mbe

r or

st

atio

n nu

mbe

r

Sele

cted

hi

gh-w

ater

m

ark

Site

nam

e

or

stat

ion

nam

e

Peak

w

ater

-sur

face

el

evat

ion,

in

feet

ab

ove

NG

VD 2

9,

June

26-

29, 2

006

FEM

A fl

ood

elev

atio

ns, i

n fe

et a

bove

NG

VD 2

9

10-y

ear fl

ood

50-y

ear fl

ood

100-

year

floo

d50

0-ye

ar fl

ood

1616

.116

.216

.3

Moh

awk

Riv

er a

t Can

ajoh

arie

, NY

306.

5630

6.46

301.

96

296.

229

6.1

294.

7

300.

230

0.1

298.

4

301.

730

1.6

299.

7

304.

530

4.4

302.

0

1717

.117

.217

.3

Moh

awk

Riv

er a

t Fon

da a

nd F

ulto

nvill

e, N

Y29

2.15

291.

8529

1.10

284.

128

4.1 --

287.

528

7.4 --

288.

628

8.6 --

290.

829

0.7 --

1818

.118

.2M

ohaw

k R

iver

at E

rie C

anal

Loc

k 12

at T

ribes

Hill

, NY

287.

7227

9.72

-- ---- --

-- ---- --

1919

.1M

ohaw

k R

iver

at S

tate

Rou

tes 5

and

67

(Wes

t Mai

n St

reet

) at

Am

ster

dam

, NY

274.

6727

1.5

275.

927

7.9

280.

2

2020

.120

.2M

ohaw

k R

iver

at E

rie C

anal

Loc

k 11

at A

mst

erda

m, N

Y

273.

5527

3.20

270.

926

6.7

274.

927

2.5

276.

927

4.8

279.

227

7.8

2121

.121

.2M

ohaw

k R

iver

at E

rie C

anal

Loc

k 10

at C

rane

svill

e, N

Y26

3.93

263.

42-- --

-- ---- --

-- --22

22.1

22.2

Moh

awk

Riv

er a

t Erie

Can

al L

ock

9 at

Rot

terd

am Ju

nctio

n, N

Y

249.

3424

7.64

244.

923

8.9

249.

524

5.0

250.

924

7.0

254.

425

0.6

0135

7500

Moh

awk

Riv

er a

t Coh

oes,

NY

69.8

369

.472

.072

.874

.4a U

pstre

am fr

om b

ridge

.b D

owns

tream

from

brid

ge.


ble5

B.

Peak

wat

er-s

urfa

ce e

leva

tions

at 4

4 hi

gh-w

ater

-mar

k si

tes

and

10 U

.S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

the

Dela

war

e Ri

ver b

asin

, NY,

dur

ing

the

flood

of

June

26-

29, 2

006,

and

cor

resp

ondi

ng fl

ood

elev

atio

ns fo

r 10-

, 50-

, 100

-, an

d 50

0-ye

ar fl

ood-

recu

rren

ce in

terv

als.

[Rec

urre

nce-

inte

rval

ele

vatio

ns a

re fr

om th

e Fe

dera

l Em

erge

ncy

Man

agem

ent A

genc

y (F

EMA

, 197

8b; 1

979c

; 198

5; 1

987a

, b, c

, e; 1

988;

199

0a, b

; 199

1b; 1

993b

; 199

9c; 2

001b

; 200

2a, d

). --

, no

data

ava

il-ab

le. L

ocat

ions

are

show

n in

figu

res 4

b an

d 12

b. S

ite d

escr

iptio

ns a

re g

iven

in a

ppen

dix

1]

Site

nu

mbe

r or

st

atio

n

num

ber

Sele

cted

hi

gh-w

ater

m

ark

Site

nam

e or

st

atio

n na

me

Peak

w

ater

-sur

face

el

evat

ion,

in

feet

ab

ove

NG

VD

29, J

une2

6–29

, 20

06

FEM

A fl

ood

elev

atio

ns ,i

n fe

et a

bove

NG

VD 2

9

10-y

earfl

ood

50-y

earfl

ood

100-

year

flood

500-

year

flood

2323

.123

.3Li

ttle

Bea

ver K

ill a

t Cou

nty

Rou

te 1

46 (D

ahlia

Roa

d) a

t Mor

rsto

n,

NY

a 1,4

68.7

2b 1

,462

.13

1,46

1.6

1,46

0.1

1,46

5.9

1,46

1.9

1,46

6.6

1,46

2.7

1,46

7.8

1,46

4.0

2424

.1Li

ttle

Bea

ver K

ill a

t Cou

nty

Rou

te 1

78 (O

ld R

oute

17)

at L

ivin

gs-

ton

Man

or, N

Y1,

427.

241,

423.

71,

425.

61,

426.

61,

427.

8

2525

.125

.2Li

ttle

Bea

ver K

ill a

t Pea

rl St

reet

at L

ivin

gsto

n M

anor

, NY

1,42

6.14

1,42

5.92

1,42

1.3

1,42

1.1

1,42

4.1

1,42

3.9

1,42

5.7

1,42

5.5

1,42

6.2

1,42

6.0

2626

.1W

illow

emoc

Cre

ek a

t Cou

nty

Rou

te 1

49 (M

ain

Stre

et) a

t Liv

ings

-to

n M

anor

, NY

1,42

6.88

1,42

2.8

1,42

6.7

1,42

8.7

1,43

0.6

2727

.1C

onflu

ence

of W

illow

emoc

Cre

ek a

nd L

ittle

Bea

ver K

ill a

t Cou

nty

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te 1

49 (M

ain

Stre

et) a

t Liv

ings

ton

Man

or, N

Y1,

425.

661,

419.

01,

421.

51,

422.

71,

424.

8

2828

.1W

illow

emoc

Cre

ek a

t Cov

ered

Brid

ge R

oad

at L

ivin

gsto

n M

anor

, N

Y1,

398.

501,

395.

81,

397.

91,

399.

01,

401.

6

2929

.329

.4W

illow

emoc

Cre

ek a

t Haz

el R

oad

at H

azel

, NY

a 1,3

40.9

4b 1

,339

.33

1,33

7.0

1,33

6.6

1,34

0.0

1,33

9.0

1,34

1.6

1,34

0.0

1,34

6.9

1,34

5.4

3030

.130

.2W

illow

emoc

Cre

ek a

t Cou

nty

Rou

te 1

24 (S

tew

art A

venu

e) a

t R

osco

e, N

Ya 1

,286

.50

b 1,2

84.9

31,

283.

01,

282.

31,

286.

61,

285.

71,

288.

01,

287.

01,

291.

01,

290.

331

31.1

Bea

ver K

ill a

t Bea

verk

ill R

oad

near

Roc

klan

d, N

Y1,

345.

32--

----

--32

32.1

32.3

Bea

ver K

ill a

t Cou

nty

Rou

te 1

79A

(Old

Rou

te 1

7) a

t Ros

coe,

NY

a 1,2

78.1

3b 1

,277

.14

1,27

2.3

1,27

1.6

1,27

7.3

1,27

5.6

1,27

8.8

1,27

7.3

1,28

1.9

1,28

1.0

0142

0500

Bea

ver K

ill a

t Coo

ks F

alls

, NY

1,17

2.25

----

----

3333

.133

.2B

eave

r Kill

at C

ooks

Fal

ls R

oad

at B

utte

rnut

Gro

ve, N

Y1,

155.

171,

155.

231,

155.

23

-- ---- --

-- ---- --

3434

.1B

eave

r Kill

at C

ount

y R

oute

17

(Old

Rou

te 1

7) a

t Hor

ton,

NY

1,11

4.40

----

----

3535

.1B

eave

r Kill

at P

eakv

ille

Roa

d at

Pea

kvill

e, N

Y1,

038.

221,

033.

71,

038.

01,

040.

01,

044.

701

4170

00Ea

st B

ranc

h D

elaw

are

Riv

er a

t Dow

nsvi

lle, N

Y1,

106.

961,

101.

41,

103.

11,

103.

51,

104.

3


ble5

B.

Peak

wat

er-s

urfa

ce e

leva

tions

at 4

4 hi

gh-w

ater

-mar

k si

tes

and

10 U

.S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

the

Dela

war

e Ri

ver b

asin

, NY,

dur

ing

the

flood

of

June

26-

29, 2

006,

and

cor

resp

ondi

ng fl

ood

elev

atio

ns fo

r 10-

, 50-

, 100

-, an

d 50

0-ye

ar fl

ood-

recu

rren

ce in

terv

als.

[Rec

urre

nce-

inte

rval

ele

vatio

ns a

re fr

om th

e Fe

dera

l Em

erge

ncy

Man

agem

ent A

genc

y (F

EMA

, 197

8b; 1

979c

; 198

5; 1

987a

, b, c

, e; 1

988;

199

0a, b

; 199

1b; 1

993b

; 199

9c; 2

001b

; 200

2a, d

). --

, no

data

ava

il-ab

le. L

ocat

ions

are

show

n in

figu

res 4

b an

d 12

b. S

ite d

escr

iptio

ns a

re g

iven

in a

ppen

dix

1]

Site

nu

mbe

r or

st

atio

n

num

ber

Sele

cted

hi

gh-w

ater

m

ark

Site

nam

e or

st

atio

n na

me

Peak

w

ater

-sur

face

el

evat

ion,

in

feet

ab

ove

NG

VD

29, J

une2

6–29

, 20

06

FEM

A fl

ood

elev

atio

ns ,i

n fe

et a

bove

NG

VD 2

9

10-y

earfl

ood

50-y

earfl

ood

100-

year

flood

500-

year

flood

3636

.236

.3Ea

st B

ranc

h D

elaw

are

Riv

er a

t Har

vard

Roa

d at

Har

vard

, NY

a 1,0

26.1

1b 1

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1,02

6.3

1,02

5.3

1,02

9.2

1,02

8.5

1,03

0.7

1,03

0.0

1,03

3.4

1,03

2.8

0141

7500

East

Bra

nch

Del

awar

e R

iver

at D

owns

ville

, NY

1,02

4.02

1,02

3.3

1,02

6.4

1,02

7.9

1,03

0.9

3737

.137

.237

.4

East

Bra

nch

Del

awar

e R

iver

at S

tate

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te 1

7 an

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ld R

oute

1

7 at

Eas

t Bra

nch,

NY

a 1,0

11.3

2a,

b 1,0

10.8

2b 1

,008

.92

1,01

1.1

1,01

0.7

1,00

9.4

1,01

5.1

1,01

4.5

1,01

2.6

1,01

6.6

1,01

6.0

1,01

3.9

1,02

0.7

1,02

0.0

1,01

7.5

0142

1000

East

Bra

nch

Del

awar

e R

iver

at F

ishs

Edd

y, N

Y97

7.39

973.

897

7.8

979.

698

3.6

3838

.138

.2Ea

st B

ranc

h D

elaw

are

Riv

er a

t Cou

nty

Rou

te 2

8 at

Fis

hs E

ddy,

N

Ya 9

75.3

2b 9

73.9

797

1.6

971.

597

5.9

975.

797

7.8

977.

598

2.2

981.

3

3939

.139

.4Ea

st B

ranc

h D

elaw

are

Riv

er a

t Sta

te R

oute

97

at H

anco

ck, N

Ya 9

08.5

3b 9

08.3

890

4.1

903.

990

8.8

908.

591

0.6

910.

491

5.8

914.

7

4040

.240

.3Ea

st B

ranc

h D

elaw

are

Riv

er a

t Nor

folk

Sou

ther

n R

ailw

ay a

t H

anco

ck, N

Ya 9

08.3

8b 9

07.9

590

3.7

903.

590

8.2

908.

091

0.1

910.

091

4.5

914.

441

41.1

41.2

Wes

t Bra

nch

Del

awar

e R

iver

at S

tate

Rou

te 2

8 (K

ings

ton

Stre

et)

at D

elhi

, NY

a 1,3

58.2

6b 1

,358

.49

1,35

7.4

1,35

7.2

1,35

9.6

1,35

9.5

1,36

0.7

1,36

0.5

1,36

2.3

1,36

2.0

4242

.142

.4W

est B

ranc

h D

elaw

are

Riv

er a

t Cou

nty

Rou

te 2

(Bag

ley

Bro

ok

Roa

d) a

t De

Lanc

ey, N

Ya 1

,288

.64

b 1,2

85.5

2-- --

-- ---- --

-- --43

43.1

Wes

t Bra

nch

Del

awar

e R

iver

at M

ill S

treet

Spu

r at H

amde

n, N

Y1,

270.

22--

----

--

4444

.444

.6W

est B

ranc

h D

elaw

are

Riv

er a

t Cou

nty

Rou

te 2

6 at

Haw

leys

, NY

a 1,2

59.7

4b 1

,257

.82

-- ---- --

-- ---- --

4545

.145

.2W

est B

ranc

h D

elaw

are

Riv

er a

t Sta

te R

oute

10

(Del

awar

e St

reet

) at

Wal

ton,

NY

1,21

3.33

1,21

2.53

1,20

9.1

1,20

8.5

1,21

2.7

1,21

2.3

1,21

3.8

1,21

3.4

1,21

5.8

1,21

5.2


ble5

B.

Peak

wat

er-s

urfa

ce e

leva

tions

at 4

4 hi

gh-w

ater

-mar

k si

tes

and

10 U

.S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

the

Dela

war

e Ri

ver b

asin

, NY,

dur

ing

the

flood

of

June

26-

29, 2

006,

and

cor

resp

ondi

ng fl

ood

elev

atio

ns fo

r 10-

, 50-

, 100

-, an

d 50

0-ye

ar fl

ood-

recu

rren

ce in

terv

als.

[Rec

urre

nce-

inte

rval

ele

vatio

ns a

re fr

om th

e Fe

dera

l Em

erge

ncy

Man

agem

ent A

genc

y (F

EMA

, 197

8b; 1

979c

; 198

5; 1

987a

, b, c

, e; 1

988;

199

0a, b

; 199

1b; 1

993b

; 199

9c; 2

001b

; 200

2a, d

). --

, no

data

ava

il-ab

le. L

ocat

ions

are

show

n in

figu

res 4

b an

d 12

b. S

ite d

escr

iptio

ns a

re g

iven

in a

ppen

dix

1]

Site

nu

mbe

r or

st

atio

n

num

ber

Sele

cted

hi

gh-w

ater

m

ark

Site

nam

e or

st

atio

n na

me

Peak

w

ater

-sur

face

el

evat

ion,

in

feet

ab

ove

NG

VD

29, J

une2

6–29

, 20

06

FEM

A fl

ood

elev

atio

ns ,i

n fe

et a

bove

NG

VD 2

9

10-y

earfl

ood

50-y

earfl

ood

100-

year

flood

500-

year

flood

4646

.146

.2W

est B

ranc

h D

elaw

are

Riv

er a

t Sta

te R

oute

s 10

and

206

(Del

a-w

are

Stre

et) a

t Wal

ton,

NY

1,21

1.79

1,21

1.03

1,20

7.7

1,20

7.1

1,21

0.7

1,20

9.3

1,21

1.7

1,21

0.3

1,21

3.3

1,21

2.0

0142

3000

Wes

t Bra

nch

Del

awar

e R

iver

at W

alto

n, N

Y1,

207.

151,

202.

51,

204.

81,

205.

71,

207.

347

47.1

47.5

Wes

t Bra

nch

Del

awar

e R

iver

at S

tate

Rou

te 1

0 at

Bee

rsto

n, N

Ya 1

,172

.90

b 1,1

69.0

4-- --

-- --1,

171.

11,

169.

7-- --

0142

5000

Wes

t Bra

nch

Del

awar

e R

iver

at S

tiles

ville

, NY

1,00

9.95

----

----

4848

.148

.2W

est B

ranc

h D

elaw

are

Riv

er a

t Oak

Stre

et a

t Dep

osit,

NY

a 995

.77

b 994

.86

987.

498

6.5

988.

698

7.8

989.

198

8.4

990.

498

9.8

4949

.1W

est B

ranc

h D

elaw

are

Riv

er a

t Fro

nt S

treet

at D

epos

it, N

Y99

4.96

----

----

5050

.150

.3W

est B

ranc

h D

elaw

are

Riv

er a

t Cou

nty

Rou

tes 4

(She

rman

Cre

ek

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nd 5

6 at

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e Ed

dy, N

Ya 9

68.7

0b 9

65.9

296

1.9

961.

3 96

3.4

962.

896

3.9

963.

396

5.3

964.

701

4265

00W

est B

ranc

h D

elaw

are

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er a

t Hal

e Ed

dy, N

Y96

5.56

961.

396

2.8

963.

396

4.7

5151

.151

.3W

est B

ranc

h D

elaw

are

Riv

er a

t PA

Sta

te R

oute

191

at H

anco

ck,

NY

a 910

.01

b 909

.66

905.

9 90

5.5

908.

890

8.5

910.

390

9.9

913.

991

3.6

5251

.151

.3N

orth

Bra

nch

Cal

licoo

n C

reek

at C

ount

y R

oute

125

at C

allic

oon

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ter,

NY

a 1,2

47.3

9b 1

,243

.69

-- ---- --

-- ---- --

5353

.153

.2Ea

st B

ranc

h C

allic

oon

Cre

ek a

t Sta

te R

oute

17B

at F

alls

Mill

s, N

Ya 9

29.3

3b 9

28.4

3-- --

-- ---- --

-- --54

54.1

54.2

54.3

Con

fluen

ce o

f Eas

t and

Nor

th B

ranc

hes o

f Cal

licoo

n C

reek

at S

tate

R

oute

17B

at H

orto

nvill

e, N

Ya 7

92.4

4a 7

91.8

4b 7

89.9

4

--78

6.5 --

--78

9.0 --

--79

0.0 --

--79

2.0 --

5555

.1C

allic

oon

Cre

ek a

t Sta

te R

oute

97

at C

allic

oon,

NY

b 760

.74

750.

675

4.3

756.

276

1.0

5656

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allic

oon

Cre

ek a

t Cre

amer

y R

oad

at C

allic

oon,

NY

758.

3475

0.4

754.

175

6.0

760.

757

57.1

Del

awar

e R

iver

at L

ordv

ille

Roa

d at

Lor

dvill

e, N

Yb 8

63.8

785

7.4

863.

586

6.6

873.

458

58.1

58.2

Del

awar

e R

iver

at B

ridge

Stre

et a

t Cal

licoo

n, N

Ya 7

59.4

1b 7

59.5

975

1.5

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1.5

751.

275

7.0

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876

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ble5

B.

Peak

wat

er-s

urfa

ce e

leva

tions

at 4

4 hi

gh-w

ater

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k si

tes

and

10 U

.S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

the

Dela

war

e Ri

ver b

asin

, NY,

dur

ing

the

flood

of

June

26-

29, 2

006,

and

cor

resp

ondi

ng fl

ood

elev

atio

ns fo

r 10-

, 50-

, 100

-, an

d 50

0-ye

ar fl

ood-

recu

rren

ce in

terv

als.

[Rec

urre

nce-

inte

rval

ele

vatio

ns a

re fr

om th

e Fe

dera

l Em

erge

ncy

Man

agem

ent A

genc

y (F

EMA

, 197

8b; 1

979c

; 198

5; 1

987a

, b, c

, e; 1

988;

199

0a, b

; 199

1b; 1

993b

; 199

9c; 2

001b

; 200

2a, d

). --

, no

data

ava

il-ab

le. L

ocat

ions

are

show

n in

figu

res 4

b an

d 12

b. S

ite d

escr

iptio

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re g

iven

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ppen

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1]

Site

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Site

nam

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me

Peak

w

ater

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face

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in

feet

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ove

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, 20

06

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A fl

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10-y

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50-y

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100-

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500-

year

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awar

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iver

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allic

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755.

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9.3

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hect

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733.

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739.

760

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Del

awar

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iver

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kinn

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alls

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471

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Del

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ear B

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Del

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ount

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583.

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586.

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594.

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Del

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at C

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at P

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461.

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Del

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.S. R

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430.

243

4.4

436.

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0143

4000

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. Rou

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and

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ble5

C.

Peak

wat

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urfa

ce e

leva

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at 3

8 hi

gh-w

ater

-mar

k si

tes

and

14 U

.S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

the

Susq

ueha

nna

Rive

r bas

in, N

Y, d

urin

g th

e flo

od o

f Jun

e 26

–29,

200

6, a

nd c

orre

spon

ding

floo

d el

evat

ions

for 1

0-, 5

0-, 1

00-,

and

500-

year

floo

d-re

curr

ence

inte

rval

s.

[Rec

urre

nce-

inte

rval

ele

vatio

ns a

re fr

om th

e Fe

dera

l Em

erge

ncy

Man

agem

ent A

genc

y (F

EMA

, 197

6a, b

, c; 1

977;

197

8a; 1

979b

; 198

0a, b

; 198

1a, b

, c, d

; 198

2a; 1

983a

; 198

4a; 1

986a

, b; 1

987f

, g; 1

992a

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; 19

93a,

c; 1

997;

199

8a; 2

000)

. --,

no d

ata

avai

labl

e. L

ocat

ions

are

show

n in

figu

res 4

c an

d 12

c. S

ite d

escr

iptio

ns a

re g

iven

in a

ppen

dix

1]

Site

nu

mbe

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st

atio

n

num

ber

Sele

cted

hi

gh-w

ater

m

ark

Site

nam

e or

sta

tion

nam

e

Peak

w

ater

-sur

face

el

evat

ion,

in

feet

ab

ove

NG

VD 2

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June

26–2

9, 2

006

FEM

A fl

ood

elev

atio

ns ,i

n fe

et a

bove

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VD 2

9

10-y

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flood

50-y

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100-

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6767

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a 1

,158

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----

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nadi

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(Lak

e St

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ew B

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b 1,0

88.6

8--

----

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69.4

Una

dilla

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er a

t Sta

te R

oute

23

at S

outh

New

Ber

lin, N

Yb 1

,055

.03

----

----

7070

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lla R

iver

at C

ount

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ockw

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Hill

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Ya 1

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987.

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iver

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iver

at L

isle

, NY

965.

47--

----

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5115

00Ti

ough

niog

a R

iver

at I

task

a, N

Y92

6.61

----

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niog

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iver

at S

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te 1

2 at

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b 894

.65

----

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4 (W

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ain

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t Ear

lvill

e, N

Yb 1

,071

.51

----

----

0150

5000

Che

nang

o R

iver

at S

herb

urne

, NY

1,04

8.51

----

----

7474

.1C

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ngo

Riv

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t Cou

nty

Rou

te 3

2A a

t Nor

wic

h, N

Ya 9

93.2

599

2.8

994.

499

5.2

997.

775

75.1

Che

nang

o R

iver

at S

tate

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te 1

2 (S

outh

Can

al S

treet

) at O

xfor

d, N

Y97

2.51

----

----

7676

.1C

hena

ngo

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er a

t Cou

nty

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te 3

2C (B

ridge

Stre

et) a

t Bris

ben,

NY

b 928

.82

925.

592

7.1

927.

893

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7777

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hena

ngo

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t Nor

th C

hena

ngo

Stre

et a

t Gre

ene,

NY

915.

1790

9.4

911.

691

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915.

301

5070

00C

hena

ngo

Riv

er a

t Gre

ene,

NY

913.

7490

8.4

910.

391

1.2

913.

278

78.1

Che

nang

o R

iver

at S

outh

Che

nang

o St

reet

at G

reen

e, N

Y91

3.62

908.

491

0.3

911.

291

3.2

0151

2500

Che

nang

o R

iver

at C

hena

ngo

Fork

s, N

Y88

5.37

885.

188

7.1

887.

988

9.8

7979

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ngo

Riv

er a

t Ots

inin

go P

ark

at D

icki

nson

, NY

849.

2284

2.0

846.

784

9.9

856.

080

80.1

Che

nang

o R

iver

at F

ront

Stre

et a

t Bin

gham

ton,

NY

847.

6783

8.0

841.

784

4.2

848.

481

81.1

Susq

ueha

nna

Riv

er a

t Cou

nty

Rou

te 3

1 (M

ain

Stre

et) a

ta 1

,197

.34

----

1,19

4.3

--81

.2 C

oope

rsto

wn,

NY

b 1,1

96.9

4--

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194.

3--

8282

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iver

at S

tate

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te 1

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t Milf

ord,

NY

a 1,1

65.1

1--

----

--


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C.

Peak

wat

er-s

urfa

ce e

leva

tions

at 3

8 hi

gh-w

ater

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k si

tes

and

14 U

.S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

the

Susq

ueha

nna

Rive

r bas

in, N

Y, d

urin

g th

e flo

od o

f Jun

e 26

–29,

200

6, a

nd c

orre

spon

ding

floo

d el

evat

ions

for 1

0-, 5

0-, 1

00-,

and

500-

year

floo

d-re

curr

ence

inte

rval

s.

[Rec

urre

nce-

inte

rval

ele

vatio

ns a

re fr

om th

e Fe

dera

l Em

erge

ncy

Man

agem

ent A

genc

y (F

EMA

, 197

6a, b

, c; 1

977;

197

8a; 1

979b

; 198

0a, b

; 198

1a, b

, c, d

; 198

2a; 1

983a

; 198

4a; 1

986a

, b; 1

987f

, g; 1

992a

,b, c

; 19

93a,

c; 1

997;

199

8a; 2

000)

. --,

no d

ata

avai

labl

e. L

ocat

ions

are

show

n in

figu

res 4

c an

d 12

c. S

ite d

escr

iptio

ns a

re g

iven

in a

ppen

dix

1]

Site

nu

mbe

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st

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n

num

ber

Sele

cted

hi

gh-w

ater

m

ark

Site

nam

e or

sta

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nam

e

Peak

w

ater

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face

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evat

ion,

in

feet

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NG

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June

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9, 2

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A fl

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elev

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ns ,i

n fe

et a

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9

10-y

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flood

50-y

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flood

100-

year

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0-ye

ar

flood

8383

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sque

hann

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at S

tate

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at C

ollie

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----

----

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iver

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neon

ta, N

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91,

080.

71,

081.

71,

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484

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080.

711,

077.

01,

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11,

080.

21,

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185

85.1

Susq

ueha

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Riv

er a

t Sta

te R

oute

205

at O

neon

ta, N

Yb 1

,065

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1,06

0.7

1,06

2.1

1,06

2.8

1,06

4.0

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sque

hann

a R

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at R

iver

Stre

et a

t Ote

go, N

Y1,

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052.

31,

054.

41,

054.

91,

056.

701

5005

00Su

sque

hann

a R

iver

at U

nadi

lla, N

Y1,

014.

971,

010.

91,

013.

01,

013.

71,

015.

087

87.1

Susq

ueha

nna

Riv

er a

t Sta

te R

oute

7 n

orth

east

of S

idne

y ne

ar U

nadi

lla, N

Y99

2.54

988.

599

0.6

991.

499

3.1

8888

.1Su

sque

hann

a R

iver

at S

tate

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te 7

nor

th o

f Sid

ney

near

Una

dilla

, NY

987.

6898

3.9

985.

998

6.5

988.

589

89.1

Susq

ueha

nna

Riv

er a

t Sta

te R

oute

206

(Eas

t Mai

n St

reet

) at B

ainb

ridge

, NY

a 984

.01

----

980.

8--

0150

2632

Susq

ueha

nna

Riv

er a

t Bai

nbrid

ge, N

Y98

3.60

----

980.

7--

9090

.2Su

sque

hann

a R

iver

at S

tate

Rou

te 4

1 (M

aple

Stre

et) a

t Afto

n, N

Ya 9

72.8

596

6.4

968.

396

9.2

970.

790

.4b 9

71.5

896

6.2

968.

096

8.8

970.

391

91.1

Susq

ueha

nna

Riv

er a

t Sta

te R

oute

7 a

t Nin

eveh

, NY

965.

0596

0.6

962.

796

3.4

965.

292

92.1

Susq

ueha

nna

Riv

er a

t Cou

nty

Rou

te 2

8 (C

hape

l Stre

et) a

t Win

dsor

, NY

a 924

.58

918.

792

0.9

921.

692

3.2

0150

2731

Susq

ueha

nna

Riv

er a

t Win

dsor

, NY

924.

2791

8.6

920.

792

1.5

922.

992

92.2

Susq

ueha

nna

Riv

er a

t Cou

nty

Rou

te 2

8 (C

hape

l Stre

et) a

t Win

dsor

, NY

b 924

.06

918.

592

0.6

921.

492

2.8

9393

.1Su

sque

hann

a R

iver

at E

xcha

nge

Stre

et a

t Sus

queh

anna

Dep

ot, P

A90

3.63

903.

190

4.6

905.

490

6.5

9494

.1Su

sque

hann

a R

iver

at U

.S. R

oute

11

(Mai

n St

reet

) at G

reat

Ben

d, P

Ab 8

74.0

387

1.3

874.

087

4.9

877.

001

5030

00Su

sque

hann

a R

iver

at C

onkl

in, N

Y86

6.06

857.

385

9.8

861.

286

3.7

9595

.1Su

sque

hann

a R

iver

at S

tate

Rou

te 7

(Con

klin

Roa

d) a

t Con

klin

, NY

860.

3385

5.8

858.

285

9.7

862.

096

96.1

Susq

ueha

nna

Riv

er a

t Bin

gham

ton,

NY

852.

0084

2.3

846.

284

8.3

853.

296

.2a 8

49.7

284

1.3

845.

184

7.2

852.

197

97.1

Susq

ueha

nna

Riv

er a

t Fro

nt S

treet

at B

ingh

amto

n, N

Y84

6.26

837.

684

1.5

843.

584

8.3

9898

.1Su

sque

hann

a R

iver

at G

rand

Ave

nue

at Jo

hnso

n C

ity, N

Y83

9.38

830.

383

4.2

836.

584

1.1

0151

3500

Susq

ueha

nna

Riv

er a

t Ves

tal,

NY

832.

8582

4.6

828.

983

0.1

835.

4


ble5

C.

Peak

wat

er-s

urfa

ce e

leva

tions

at 3

8 hi

gh-w

ater

-mar

k si

tes

and

14 U

.S. G

eolo

gica

l Sur

vey

stre

am-g

agin

g st

atio

ns in

the

Susq

ueha

nna

Rive

r bas

in, N

Y, d

urin

g th

e flo

od o

f Jun

e 26

–29,

200

6, a

nd c

orre

spon

ding

floo

d el

evat

ions

for 1

0-, 5

0-, 1

00-,

and

500-

year

floo

d-re

curr

ence

inte

rval

s.

[Rec

urre

nce-

inte

rval

ele

vatio

ns a

re fr

om th

e Fe

dera

l Em

erge

ncy

Man

agem

ent A

genc

y (F

EMA

, 197

6a, b

, c; 1

977;

197

8a; 1

979b

; 198

0a, b

; 198

1a, b

, c, d

; 198

2a; 1

983a

; 198

4a; 1

986a

, b; 1

987f

, g; 1

992a

,b, c

; 19

93a,

c; 1

997;

199

8a; 2

000)

. --,

no d

ata

avai

labl

e. L

ocat

ions

are

show

n in

figu

res 4

c an

d 12

c. S

ite d

escr

iptio

ns a

re g

iven

in a

ppen

dix

1]

Site

nu

mbe

r or

st

atio

n

num

ber

Sele

cted

hi

gh-w

ater

m

ark

Site

nam

e or

sta

tion

nam

e

Peak

w

ater

-sur

face

el

evat

ion,

in

feet

ab

ove

NG

VD 2

9,

June

26–2

9, 2

006

FEM

A fl

ood

elev

atio

ns ,i

n fe

et a

bove

NG

VD 2

9

10-y

ear

flood

50-y

ear

flood

100-

year

flo

od50

0-ye

ar

flood

9999

.1Su

sque

hann

a R

iver

at K

inne

y R

oad

at C

ampv

ille,

NY

821.

7781

6.4

820.

082

2.0

825.

510

010

0.1

Susq

ueha

nna

Riv

er a

t Sta

te R

oute

17C

(5th

Ave

nue)

at O

weg

o, N

Y81

4.81

812.

081

4.6

816.

781

9.8

0151

3831

Susq

ueha

nna

Riv

er a

t Ow

ego,

NY

812.

5480

9.3

812.

681

5.0

817.

710

110

1.1

Susq

ueha

nna

Riv

er a

t Will

iam

Stre

et a

t Ow

ego,

NY

812.

2480

9.2

812.

581

4.9

817.

610

210

2.1

Susq

ueha

nna

Riv

er a

t Sta

te R

oute

17

at N

icho

ls, N

Y79

5.01

789.

679

3.1

794.

879

8.6

103

103.

1Su

sque

hann

a R

iver

at R

iver

side

Driv

e at

Say

re, P

A76

7.48

763.

976

7.0

768.

477

1.0

0151

5000

Susq

ueha

nna

Riv

er n

ear W

aver

ly, N

Y76

6.48

763.

276

6.3

767.

777

0.2

104

104.

1Su

sque

hann

a R

iver

at R

iver

side

Driv

e at

Ath

ens,

PA76

4.19

759.

576

2.2

763.

676

6.2

a Ups

tream

from

brid

ge.

b Dow

nstre

am fr

om b

ridge

.


424

425

426

427

428

429

430

646

647

648

649

650

2.5 3 3.5

Mohawk River basinflood elevations

796

797

798

799

800

801

802

N, I

N F

EET

ABOV

E N

GVD

29

682

686

690

694

698

702

706

21

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


420

421

422

423

424

425

426

427

428

429

430

7.5 8 8.5

SITE NUMBER

646

647

648

649

650

2.5 3 3.5


1060.01070.01080.01090.01100.01110.01120.0

10 11 12

Elev

atio

n, i

n fe

et a

bove

sea

lev

el

Site number

East Branch Delaware Riv er flood elev ations500-year flood-recurrence-interval elevation (FEMA 1979a; 1982b, c, d, e, f; 1983b; 1984b; 1987d; 1991a; 1998b; 1999a, b; 2001a; 2002b, c)100-year flood-recurrence-interval elevation (FEMA 1979a; 1982b, c, d, e, f; 1983b; 1984b; 1987d; 1991a; 1998b; 1999a, b; 2001a; 2002b, c)50-year flood-recurrence-interval elevation (FEMA 1979a; 1982b, c, d, e, f; 1983b; 1984b; 1987d; 1991a; 1998b; 1999a, b; 2001a; 2002b, c)10-year flood-recurrence-interval elevation (FEMA 1979a; 1982b, c, d, e, f; 1983b; 1984b; 1987d; 1991a; 1998b; 1999a, b; 2001a; 2002b, c)June 26-29, 2006, peak water-surface elevation (US Geological Survey)

793

794

795

796

797

798

799

800

801

802

5.665.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

682

686

690

694

698

702

706

21

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


EXPLANATION

Figure 13A. Peak water-surface elevations at selected sites in the Mohawk River basin, NY, during flood of June 26–29, 2006, and flood-recurrence-interval elevations from Federal Emergency Management Agency flood-insurance studies. (Site names and locations are shown in table 5.)


385

387

389

391

393

395

397

399

019

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER


370

371

372

373

374

375

376

377

11.5 12 12.5SITE NUMBER


329

330

331

332

333

334

N F

EET

ABOV

E N

GVD

29

306

308

310

312

314

385

387

389

391

393

395

397

399

019

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER


370

371

372

373

374

375

376

377

11.5 12 12.5SITE NUMBER


326

327

328

329

330

331

332

333

334

12.5 13 13.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

300

302

304

306

308

310

312

314

13.5 14 14.5

SITE NUMBER

1060.01070.01080.01090.01100.01110.01120.0

10 11 12

Elev

atio

n, i

n fe

et a

bove

sea

lev

el

Site number

East Branch Delaware Riv er flood elev ations500-year flood-recurrence-interval elevation (FEMA 1979a; 1982b, c, d, e, f; 1983b; 1984b; 1987d; 1991a; 1998b; 1999a, b; 2001a; 2002b, c)100-year flood-recurrence-interval elevation (FEMA 1979a; 1982b, c, d, e, f; 1983b; 1984b; 1987d; 1991a; 1998b; 1999a, b; 2001a; 2002b, c)50-year flood-recurrence-interval elevation (FEMA 1979a; 1982b, c, d, e, f; 1983b; 1984b; 1987d; 1991a; 1998b; 1999a, b; 2001a; 2002b, c)10-year flood-recurrence-interval elevation (FEMA 1979a; 1982b, c, d, e, f; 1983b; 1984b; 1987d; 1991a; 1998b; 1999a, b; 2001a; 2002b, c)June 26-29, 2006, peak water-surface elevation (US Geological Survey)

EXPLANATION



284286288290292294296298300302304306308310312

716151

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


270

271

272

273

274

275

276

277

278

279

280

281

282

0291SITE NUMBER


247248249250251252253254255256

, IN

FEE

T AB

OVE

NGV

D 29

284286288290292294296298300302304306308310312

716151

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


270

271

272

273

274

275

276

277

278

279

280

281

282

0291SITE NUMBER


242243244245246247248249250251252253254255256

21.5 22 22.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

1060.01070.01080.01090.01100.01110.01120.0

10 11 12

Elev

atio

n, i

n fe

et a

bove

sea

lev

el

Site number

East Branch Delaw are Riv er flood elev ations500-year flood-recurrence-interval elevation (FEMA 1979a; 1982b, c, d, e, f; 1983b; 1984b; 1987d; 1991a; 1998b; 1999a, b; 2001a; 2002b, c)100-year flood-recurrence-interval elevation (FEMA 1979a; 1982b, c, d, e, f; 1983b; 1984b; 1987d; 1991a; 1998b; 1999a, b; 2001a; 2002b, c)50-year flood-recurrence-interval elevation (FEMA 1979a; 1982b, c, d, e, f; 1983b; 1984b; 1987d; 1991a; 1998b; 1999a, b; 2001a; 2002b, c)10-year flood-recurrence-interval elevation (FEMA 1979a; 1982b, c, d, e, f; 1983b; 1984b; 1987d; 1991a; 1998b; 1999a, b; 2001a; 2002b, c)June 26-29, 2006, peak water-surface elevation (US Geological Survey)

EXPLANATION



1,460

1,461

1,462

1,463

1,464

1,465

1,466

1,467

1,468

1,469

1,470

22.5 23 23.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

Delaware River basinflood elevations

1,4181,4191,4201,4211,4221,4231,4241,4251,4261,4271,4281,4291,4301,4311,432

24 25 26 27


1 397

1,398

1,399

1,400

1,401

1,402

ON, I

N F

EET

ABOV

E N

GVD

29

1 338

1,340

1,342

1,344

1,346

1,348

1,460

1,461

1,462

1,463

1,464

1,465

1,466

1,467

1,468

1,469

1,470

22.5 23 23.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


1,4181,4191,4201,4211,4221,4231,4241,4251,4261,4271,4281,4291,4301,4311,432

24 25 26 27


1,395

1,396

1,397

1,398

1,399

1,400

1,401

1,402

27.5 28 28.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

1,334

1,336

1,338

1,340

1,342

1,344

1,346

1,348

28.5 29 29.5

SITE NUMBER

1060.01080.01100.01120.0

10 11 12

Elev

atio

n, in

feet

ab

ove

sea

leve

l

Site number

East Branch Delaware River flood elevations500-year flood-recurrence-interval elevation (FEMA 1978b; 1979c; 1985; 1987a, b, c, e; 1988; 1990a, b; 1991b; 1993b; 1999c; 2001b; 2002a, d)100-year flood-recurrence-interval elevation (FEMA 1978b; 1979c; 1985; 1987a, b, c, e; 1988; 1990a, b; 1991b; 1993b; 1999c; 2001b; 2002a, d)50-year flood-recurrence-interval elevation (FEMA 1978b; 1979c; 1985; 1987a, b, c, e; 1988; 1990a, b; 1991b; 1993b; 1999c; 2001b; 2002a, d)10-year flood-recurrence-interval elevation (FEMA 1978b; 1979c; 1985; 1987a, b, c, e; 1988; 1990a, b; 1991b; 1993b; 1999c; 2001b; 2002a, d)June 26-29, 2006, peak water-surface elevation (US Geological Survey)

EXPLANATION

Figure 13B. Peak water-surface elevations at selected sites in the Delaware River basin, NY, during flood of June 26–29, 2006, and flood-recurrence-interval elevations from Federal Emergency Management Agency flood-insurance studies. (Site names and locations are shown in table 5.)


1,282

1,283

1,284

1,285

1,286

1,287

1,288

1,289

1,290

1,291

1,292

29.5 30 30.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


1,271

1,272

1,273

1,274

1,275

1,276

1,277

1,278

1,279

1,280

1,281

1,282

1,283

31.5 32 32.5


1,031

1,033

1,035

1,037

1,039

1,041

1,043

1,045

N, I

N F

EET

ABOV

E N

GVD

29

1,014

1,015

1,016

1,017

1,018

1,019

1,020

1,021

1,022

1,282

1,283

1,284

1,285

1,286

1,287

1,288

1,289

1,290

1,291

1,292

29.5 30 30.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


1,271

1,272

1,273

1,274

1,275

1,276

1,277

1,278

1,279

1,280

1,281

1,282

1,283

31.5 32 32.5


1,025

1,027

1,029

1,031

1,033

1,035

1,037

1,039

1,041

1,043

1,045

6353

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

1,010

1,011

1,012

1,013

1,014

1,015

1,016

1,017

1,018

1,019

1,020

1,021

1,022

36.5 37 37.5

SITE NUMBER

1060.01080.01100.01120.0

10 11 12

Elev

atio

n, in

feet

ab

ove

sea

leve

l

Site number


EXPLANATION

Figure 13B. Peak water-surface elevations at selected sites in the Delaware River basin, NY, during flood of June 26–29, 2006, and flood-recurrence-interval elevations from Federal Emergency Management Agency flood-insurance studies. (Site names and locations are shown in table 5.) v



969

971

973

975

977

979

981

983

37.5 38 38.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


902

904

906

908

910

912

914

916

918

0493


1,359

1,360

1,361

1,362

1,363

1,364

N, I

N F

EET

ABOV

E N

GVD

29

1,210

1,211

1,212

1,213

1,214

1,215

1,216

1,217

969

971

973

975

977

979

981

983

37.5 38 38.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


902

904

906

908

910

912

914

916

918

0493


1,356

1,357

1,358

1,359

1,360

1,361

1,362

1,363

1,364

40.5 41 41.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

1,207

1,208

1,209

1,210

1,211

1,212

1,213

1,214

1,215

1,216

1,217

6454

SITE NUMBER

1060.01080.01100.01120.0

10 11 12

Elev

atio

n, in

feet

ab

ove

sea

leve

l

Site number


EXPLANATION


1,166

1,167

1,168

1,169

1,170

1,171

1,172

1,173

1,174

1,175

46.5 47 47.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


985

986

987

988

989

990

991

992

993

994

995

996

997

998

47.5 48 48.5


962

963

964

965

966

967

968

969

970

N, I

N F

EET

ABOV

E N

GVD

29

908

909

910

911

912

913

914

915

1,166

1,167

1,168

1,169

1,170

1,171

1,172

1,173

1,174

1,175

46.5 47 47.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


985

986

987

988

989

990

991

992

993

994

995

996

997

998

47.5 48 48.5


959

960

961

962

963

964

965

966

967

968

969

970

49.5 50 50.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

905

906

907

908

909

910

911

912

913

914

915

50.5 51 51.5

SITE NUMBER

1060.01080.01100.01120.0

10 11 12

Elev

atio

n, in

feet

ab

ove

sea

leve

l

Site number


EXPLANATION



785

786

787

788

789

790

791

792

793

53.5 54 54.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


862

864

866

868

870

872

874

ON, I

N F

EET

ABOV

E N

GVD

29

744

746

748

750

752

754

756

758

760

762

764

6555


728

732

736

740

744

748

752

756

760

764

785

786

787

788

789

790

791

792

793

53.5 54 54.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


856

858

860

862

864

866

868

870

872

874

56.5 57 57.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

744

746

748

750

752

754

756

758

760

762

764

6555


712

716

720

724

728

732

736

740

744

748

752

756

760

764

58 59 60

SITE NUMBER

1060.01080.01100.01120.0

10 11 12

Elev

atio

n, in

feet

ab

ove

sea

leve

l

Site number


EXPLANATION



574

576

578

580

582

584

586

588

590

592

594

596

598

600

62.5 63 63.5


608

618

628

638

648

658

668

678

688

698

708

2616

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


442

446

450

454

458

462

466

470

526

528

530

532

534

536

N, I

N F

EET

ABOV

E N

GVD

29

574

576

578

580

582

584

586

588

590

592

594

596

598

600

62.5 63 63.5


608

618

628

638

648

658

668

678

688

698

708

2616

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


430

434

438

442

446

450

454

458

462

466

470

6656

SITE NUMBER

520

522

524

526

528

530

532

534

536

63.5 64 64.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

1060.01080.01100.01120.0

10 11 12

Elev

atio

n, in

feet

ab

ove

sea

leve

l

Site number


EXPLANATION



1,004

1,005

1,006

1,007

1,008

1,009

1,010

69.5 70 70.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

Susquehanna River basinflood elevations

982

983

984

985

986

987

988

989

990

70.5 71 71.5


993

994

995

996

997

998

999

890

895

900

905

910

N, I

N F

EET

ABOV

E N

GVD

29

1,004

1,005

1,006

1,007

1,008

1,009

1,010

69.5 70 70.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


982

983

984

985

986

987

988

989

990

70.5 71 71.5


991

992

993

994

995

996

997

998

999

73.5 74 74.5

SITE NUMBER

880

885

890

895

900

905

910

71.5 72 72.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

EXPLANATION

1060.0

1070.0

1080.0

1090.0

1100.0

1110.0

1120.0

10 11 12

Elev

atio

n, i

n fe

et a

bove

sea

lev

el

Site number

East Branch Delaware River flood elevations500-year flood-recurrence-interval elevation (FEMA 1976a, b, c; 1977; 1978a; 1979b; 1980a, b; 1981a, b, c, d; 1982a; 1983a; 1984a; 1986a, b; 1987f, g; 1992a ,b, c; 1993a, c; 1997; 1998a; 2000)100-year flood-recurrence-interval elevation (FEMA 1976a, b, c; 1977; 1978a; 1979b; 1980a, b; 1981a, b, c, d; 1982a; 1983a; 1984a; 1986a, b; 1987f, g; 1992a ,b, c; 1993a, c; 1997; 1998a; 2000)50-year flood-recurrence-interval elevation (FEMA 1976a, b, c; 1977; 1978a; 1979b; 1980a, b; 1981a, b, c, d; 1982a; 1983a; 1984a; 1986a, b; 1987f, g; 1992a ,b, c; 1993a, c; 1997; 1998a; 2000)10-year flood-recurrence-interval elevation (FEMA 1976a, b, c; 1977; 1978a; 1979b; 1980a, b; 1981a, b, c, d; 1982a; 1983a; 1984a; 1986a, b; 1987f, g; 1992a ,b, c; 1993a, c; 1997; 1998a; 2000)June 26-29, 2006, peak water-surface elevation (US Geological Survey)

Figure 13C. Peak water-surface elevations at selected sites in the Susquehanna River basin, NY, during flood of June 26–29, 2006, and flood-recurrence-interval elevations from Federal Emergency Management Agency flood-insurance studies. (Site names and locations are shown in table 5.)


924

925

926

927

928

929

930

931

932

75.5 76 76.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


841

843

845

847

849

851

853

855

857

N, I

N F

EET

ABOV

E N

GVD

29

908

909

910

911

912

913

914

915

916

8777


1,193

1,194

1,195

1,196

1,197

1,198

1,199

1,200

924

925

926

927

928

929

930

931

932

75.5 76 76.5

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


835

837

839

841

843

845

847

849

851

853

855

857

0897

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

908

909

910

911

912

913

914

915

916

8777


1,190

1,191

1,192

1,193

1,194

1,195

1,196

1,197

1,198

1,199

1,200

80.5 81 81.5

SITE NUMBER

EXPLANATION

1060.0

1070.0

1080.0

1090.0

1100.0

1110.0

1120.0

10 11 12

Elev

atio

n, i

n fe

et a

bove

sea

lev

el

Site number




1,050

1,051

1,052

1,053

1,054

1,055

1,056

1,057

1,058

85.5 86 86.5


964

966

968

970

972

974

1,060

1,062

1,064

1,066

1,068

1,070

1,072

1,074

1,076

1,078

1,080

1,082

1,084

1,086

5848

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


984

986

988

990

992

994

N, I

N F

EET

ABOV

E N

GVD

29

1,050

1,051

1,052

1,053

1,054

1,055

1,056

1,057

1,058

85.5 86 86.5


958

960

962

964

966

968

970

972

974

1909

SITE NUMBER

1,060

1,062

1,064

1,066

1,068

1,070

1,072

1,074

1,076

1,078

1,080

1,082

1,084

1,086

5848

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


980

982

984

986

988

990

992

994

87 88 89

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

EXPLANATION

1060.0

1070.0

1080.0

1090.0

1100.0

1110.0

1120.0

10 11 12

Elev

atio

n, i

n fe

et a

bove

sea

lev

el

Site number




903

905

907

909

911

913

915

917

919

921

923

925

3929

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


870

871

872

873

874

875

876

877

878

93.5 94 94.5


844846848850852854856858860862864

N, I

N F

EET

ABOV

E N

GVD

29

820822824826828830832834836838840842

903

905

907

909

911

913

915

917

919

921

923

925

3929

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29


870

871

872

873

874

875

876

877

878

94


836838840842844846848850852854856858860862864

95 96 97

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER

810812814816818820822824826828830832834836838840842

98 99 100

SITE NUMBER

EXPLANATION

1060.0

1070.0

1080.0

1090.0

1100.0

1110.0

1120.0

10 11 12

Elev

atio

n, i

n fe

et a

bove

sea

lev

el

Site number




788

792

796

800

804

808

812

816

820

201101

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER


756

758

760

762

764

766

768

770

772

401301

SITE NUMBER


788

792

796

800

804

808

812

816

820

201101

ELEV

ATIO

N, I

N F

EET

ABOV

E N

GVD

29

SITE NUMBER


756

758

760

762

764

766

768

770

772

401301

SITE NUMBER


EXPLANATION

1060.0

1070.0

1080.0

1090.0

1100.0

1110.0

1120.0

10 11 12

Elev

atio

n, i

n fe

et a

bove

sea

lev

el

Site number




between the 100- and 500-year flood-profile elevations. At Greene (sites 77 and 78), the peak water-surface elevations were near the 500-year flood-profile elevations, and at the Chenango River at Greene stream-gaging station (01507000), the recorded peak water-surface elevation was near the 500-year flood profile. The peak discharge at the Chenango River at Greene stream-gaging station has a recurrence interval of greater than 100 years. At the USGS stream-gaging station Chenango River at Chenango Forks (01512500), 1.2 mi downstream from the confluence with the Tioughnioga River, the recorded peak water-surface elevation was in the range of the 10-year flood profile and the peak discharge indicated about a 20-year recurrence interval, but farther downstream at Dickinson (site 79) and at Binghamton (site 80), the peak water-surface elevations were in the range of the 100-year and the 500-year flood-profile elevations, respectively. These higher peak water-surface elevations at sites 79 and 80 were primarily because of backwater from the Susquehanna River.

The Susquehanna River was studied from Cooperstown, NY, (site 81) downstream to Athens, PA (site 104). FEMA flood-insurance studies were available for most study sites along the study reach of the Susquehanna River. The 100-year flood profile was the only profile available for the Cooperstown study site (site 81), and the peak water-surface elevation was higher than the 100-year flood-profile elevation. Peak water-surface elevations from Oneonta (site 84) to Otego (site 86) were generally equal to or higher than the 500-year flood-profile elevation. Along the Susquehanna River near the communities of Unadilla and Sidney (sites 87 and 88), the peak water-surface elevations were generally between the 100- and the 500-year flood-profile elevations. At the Susquehanna River at Unadilla stream-gaging station (01500500), the recorded peak water-surface elevation was at the 500-year flood-profile elevation, and the peak discharge indicated a recurrence interval greater than 100 years (table 3). The 100-year flood profile was the only profile available for the Bainbridge area. At Bainbridge (site 89), the peak water-surface elevation was 3.2 ft higher than the 100-year flood-profile elevation. The Susquehanna River at Bainbridge stream-gaging station (01502632) recorded a peak water-surface elevation that was 2.9 ft higher than the 100-year flood-profile elevation and a peak discharge that indicated a recurrence interval of greater than 100 years. Downstream in the communities of Afton (site 90), Nineveh (site 91), and Windson (site 92), the peak water-surface elevations were equal to or higher than the 500-year flood-profile elevations. Peak water-surface elevations at Susquehanna Depot, PA, (site 93) and Great Bend, PA, (site 94) were generally in the range of the 50-year flood profile. The USGS stream-gaging station Susquehanna River at Conklin (01503000) recorded a peak water-surface elevation that was greater than the 500-year flood profile at its location, and the peak discharge indicated a recurrence interval greater than 100 years. Peak water-surface elevations in the communities of

Conklin (site 95) downstream through the City of Binghamton (sites 96 and 97) to Johnson City (site 98) were determined to be between the range of the 100- and 500-year flood-profile elevations. At the Susquehanna River at Vestal stream-gaging station (01513500), the recorded peak water-surface elevation was between the 100- and 500-year flood profiles, and the peak discharge indicated a recurrence interval of greater than 100 years. Peak water-surface elevations in the area of Campville, NY, (site 99) downstream through sites 100 to 103 to Athens, PA, (site 104) in general were determined to be in the range of the 50- and 100-year flood-profile elevations. At the Susquehanna River at Waverly stream-gaging station (01515000), the recorded peak water-surface elevation was slightly higher than the 50-year flood profile, and the peak discharge indicated a recurrence interval of 40 years

Flood DamageA state of emergency was declared by officials in several

towns in the 12 counties that were declared Federal disaster areas after the severe flooding of June 26–29, 2006. Hundreds of residents that live near the East Canada Creek and the Mohawk River were asked to evacuate their homes because of the flooding. On June 28, 2006, the New York State Canal Corporation closed the Erie Canal system from Lock 2 west to Lock 22 and the entire Champlain Canal system because of high water. Among the damages caused by the flood in the Mohawk River basin are the collapse of a historic restaurant in Dolgeville into the East Canada Creek on June 28, damage to several of the New York State Canal Corporations locks along the Erie Canal, and millions of dollars in damage to the Beech-Nut Nutrition Corporation’s facilities in Canajoharie and Fort Plain (Daily Gazette, 2008). Many of the communities that experienced major flooding in the recent September 2004 and April 2005 floods in the Delaware River basin were flooded again during June 2006. At least 1,000 residents were asked to evacuate the City of Port Jervis by June 28. The community of Livingston Manor was flooded by tributaries to the East Branch of the Delaware River. Local officials indicated that the flood hit the community suddenly, and many residents had to be rescued from their homes by emergency personnel (Times Herald Record, 2006). The flood of June 2006 was blamed for four deaths across New York, one of which was that of a 15 year-old girl in Livingston Manor who was swept away from her front porch as she waited to be rescued and the front section of her home collapsed into the floodwaters of Cattail Brook, a tributary to the Willowemoc Creek (Times Herald Record, 2006) in the morning of June 28.

In the Susquehanna River basin three people died during the morning of June 28 as a result of the flooding. One man perished when his truck plunged into White Stone Brook, a tributary to the Unadilla River, when the culvert under

Acknowledgements 91

Holmesville Hill Road in the Town of Norwich washed out. Two men lost their lives when their tractor trailers plunged into Carrs Creek, a tributary to the Susquehanna River, when the culvert under Interstate Route 88 in the Town of Sidney washed out (fig 14A). Along the banks of the Susquehanna River, several communities were inundated, and the City of Binghamton was not spared from the flooding (fig. 14B). Four to five thousand residents were evacuated, many roads were closed, including State Route 17 in both directions, and several thousand residents were left without power. Several days later on July 1, boil water advisories remained in effect for several towns including the towns of Union, Windsor, and Vestal, NY. More than 15,500 individuals had applied for assistance by September 1, 2006, and FEMA announced that families, individuals, and businesses who were adversely affected by the flooding in June 2006 had received more than $112 million in assistance from FEMA, the Small Business Administration, and the State of New York (Federal Emergency Management Agency, 2006). On December 29, 2006, FEMA announced that the amount of disaster assistance approved for New York families, businesses, and public entities had been increased to more than $227 million. Photographs of flood damage to selected areas in the Mohawk, Delaware, and Susquehanna River basins are shown in appendix 3.

SummaryExtended heavy rains that spread south to north across

southern New York produced widespread rainfall amounts of 5 to 6 in. and localized reports of greater than 13 in. in several areas in New York. Prior to June 2006, streamflow conditions in the Mohawk, Delaware, and Susquehanna River regions were generally in the normal to dry range. Rainfall from this storm produced new period-of-record peak water-surface elevations and discharges at several USGS stream-gaging stations, including those at Mohawk River at Little Falls, West Branch Delaware River at Hale Eddy, and Susquehanna River at Conklin, NY. These stations and several others also recorded peak discharges that exceeded the 100-year recurrence interval as a result of this storm. Prior to the June 2006 flood, the Hinckley Reservoir was at 93 percent of capacity, and the Cannonsville and Pepacton Reservoirs were both at 101 percent of capacity. East Sidney and Whitney Point Lake, flood-control reservoirs operated by the U.S. Army Corp of Engineers, were at 10 and 15 percent of capacity, respectively, prior to the storm. Although most of the reservoirs in the Mohawk, Delaware, and Susquehanna River basins did eventually spill, with the exceptions of Whitney Point Lake, Prompton Reservoir, and General Edgar Jadwin Reservoir, they all managed to attenuate the flood magnitude to downstream communities. Four lives were lost, thousands of people were asked to evacuate, hundreds of miles

of roadway were closed, and many homes were damaged or lost as a result of this flood. The Department of Homeland Security, Federal Emergency Management Agency (Federal Emergency Management Agency, 2006) announced that a major disaster had been declared for New York to supplement state and local recovery efforts in the areas struck by severe storms and flooding that began on June 26, 2006. Twelve counties in New York were named in the disaster declaration, and by December 29, 2006, FEMA had announced that families, individuals, businesses, and public entities had received more than $227 million in assistance from FEMA, the Small Business Administration, and the State of New York for damages not covered by insurance and for state and local agencies to repair flood damages and rebuild infrastructure damaged during the flood .

This report studied 104 sites in the combined Mohawk, Delaware, and Susquehanna River basins. Peak water-surface elevations were surveyed and compared to flood-profile elevations in the flood-insurance studies published by FEMA. Peak water-surface elevations at many of the study sites were determined to be greater than the 100-year flood-profile elevations, and some were determined to be greater than the 500-year flood-profile elevations. Along the Delaware River, the peak discharge during the June 2006 flood was greater than that from the August 1955 flood at the USGS stream-gaging station at Delaware River above Lackawaxen River near Barryville, NY; and at the USGS stream-gaging stations on the Delaware River at Port Jervis, NY, and Montague, NJ, the peak discharges were the highest since 1955. The June 2006 flood produced greater peak discharges/ than the March 1977 flood along parts of the Mohawk River and greater than the July 1935 and March 1936 floods in parts of the upper Susquehanna River basin in New York.

Acknowledgements

Thanks are extended to the New York State Department of Transportation for cooperating with the USGS to compute updated flood frequencies for the stream-gaging stations, and to the National Weather Service and New York City Department of Environmental Protection for providing data included in this report. Thanks also are extended to the following USGS hydrologists and hydrologic technicians who collected the data for this report during and after the flood: L.T. Brooks, W.F. Coon, A.M. Gearwar, J.S. Grover, M.E. Hendricks, T.F. Hoffman, M.B. Jennings, R. Lumia, J.P. Marion, K. McGrath, S.K. McInnes, A.G. Morgan, K.D. Reisig, J.E. Smith, M.J. Welsh, H.J. Zajd, and B.J. Zatorsky.


Figure 14A. Top–Collapse of Interstate Route 88 over Carrs Creek near Unadilla (Exit 10), NY, on June 28, 2006. Bottom–Carrs Creek and washed-out culvert at Interstate Route 88 near Unadilla (exit 10), NY, on June 28, 2006. Photos courtesy of The Daily Star, taken by staff photographer Julie Lewis.

Summary 93

Figure 14B. Top–Susquehanna River floodwaters overtop floodwall along North Shore Drive, Binghamton, NY, on June 28, 2006. Photo courtesy of Alan A. Katz. Bottom—Susquehanna River floodwaters overflow Washington Street pedestrian bridge, Binghamton, NY, on June 28, 2006. Photo courtesy of James Willis.


Selected References

Bailey, J.F., and others, 1975, Hurricane Agnes rainfall and flood, June–July 1972: U.S. Geological Survey Professional Paper 924, 403 p.

Benson, M.A., and Dalrymple, Tate, 1967, General field and office procedures for indirect discharge measurements: U.S. Geological Survey Techniques of Water-Resources Investigations, book 3, chap. A1, 30 p.

Binghamton, City of, New York, 2006, City of Binghamton-Flood Updates: June 2006 Flood, accessed June 4, 2008, at http://www.cityofbinghamton.com/flood.asp

Bogart, D.B., 1960, Floods of August–October 1955 New England to North Carolina: U.S. Geological Survey Water-Supply Paper 1420, 854 p.

Brooks, L.T., 2005, Flood of September 18–19, 2004 in the Upper Delaware River Basin, New York: U.S. Geologcial Survey Open-File Report 2005-1166, 123 p.

Broome County, New York, 2006, News release archives June 2006: accessed June 4, 2008, at http://www.gobroomecounty.com/press/PressArchives2006.php

Daily Gazette, 2008, Town OKs Beech-Nut plan: Schenectady, N.Y., May 16, 2006, accessed June 4, 2008, at http://www.dailygazette.com/news/2008/may/16/0516_beech/.

Federal Emergency Management Agency, 1976a, Flood Insurance Study, Town of Dickinson, Broome County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1976, 14 p.

Federal Emergency Management Agency, 1976b, Flood Insurance Study, Town of Conklin, Broome County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1976, 17 p.

Federal Emergency Management Agency, 1976c, Flood Insurance Study, City of Binghamton, Broome County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1976, 18 p.

Federal Emergency Management Agency, 1977, Flood Insurance Study, Village of Johnson City, Broome County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1977, 14 p.

Federal Emergency Management Agency, 1978a, Flood Insurance Study, City of Oneonta, Otsego County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1978, 20 p.

Federal Emergency Management Agency, 1978b, Flood Insurance Study, Village of Deposit, Broome and Delaware Counties, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1978, 17 p.

Federal Emergency Management Agency, 1979a, Flood Insurance Study, City of Cohoes, Albany County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1979, 25 p.

Federal Emergency Management Agency, 1979b, Flood Insurance Study, Township of Athens, Bradford County, Pennsylvania: Federal Emergency Management Agency, Federal Insurance Administration, 1979, 25 p.

Federal Emergency Management Agency, 1979c, Flood Insurance Study, Town of Sanford, Broome County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1979, 20 p.

Federal Emergency Management Agency, 1980a, Flood Insurance Study, Borough of Susquehanna Depot, Susquehanna County, Pennsylvania: Federal Emergency Management Agency, Federal Insurance Administration, 1980, 15 p.

Federal Emergency Management Agency, 1980b, Flood Insurance Study, Township of Great Bend, Susquehanna County, Pennsylvania: Federal Emergency Management Agency, Federal Insurance Administration, 1980, 18 p.

Federal Emergency Management Agency, 1981a, Flood Insurance Study, Town of Fenton, Broome County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1981, 20 p.

Federal Emergency Management Agency, 1981b, Flood Insurance Study, Town of Greene, Chenango County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1981, 20 p.

Federal Emergency Management Agency, 1981c, Flood Insurance Study, Village of Greene, Chenango County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1981, 20 p.

Federal Emergency Management Agency, 1981d, Flood Insurance Study, Town of Nichols, Tioga County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1981, 17 p.

Federal Emergency Management Agency, 1982a, Flood Insurance Study, Village of Owego, Tioga County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1982, 15 p.

Federal Emergency Management Agency, 1982b, Flood Insurance Study, Village of Fultonville, Montgomery County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1982, 15 p.

Selected References 95

Federal Emergency Management Agency, 1982c, Flood Insurance Study, Village of Canajoharie, Montgomery County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1982, 16 p.

Federal Emergency Management Agency, 1982d, Flood Insurance Study, Village of Fonda, Montgomery County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1982, 16 p.

Federal Emergency Management Agency, 1982e, Flood Insurance Study, Village of Dolgeville, Herkimer and Fulton Counties, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1982, 18 p.

Federal Emergency Management Agency, 1982f, Flood Insurance Study, City of Little Falls, Herkimer County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1982, 17 p.

Federal Emergency Management Agency, 1983a, Flood Insurance Study, City of Cortland, Cortland County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1983, 15 p.

Federal Emergency Management Agency, 1983b, Flood Insurance Study, Town of Rotterdam, Schenectady County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1983, 19 p.

Federal Emergency Management Agency, 1984a, Flood Insurance Study, Town of Norwich, Chenango County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1984, 18 p.

Federal Emergency Management Agency, 1984b, Flood Insurance Study, City of Amsterdam, Montgomery County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1984, 18 p.

Federal Emergency Management Agency, 1985, Flood Insurance Study, Village of Delhi, Delaware County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1985, 13 p.

Federal Emergency Management Agency, 1986a, Flood Insurance Study, Town of Oneonta, Otsego County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1986, 21 p.

Federal Emergency Management Agency, 1986b, Flood Insurance Study, Village of Otego, Otsego County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1986, 17 p.

Federal Emergency Management Agency, 1987a, Flood Insurance Study, Town of Delaware, Sullivan County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1987, 16 p.

Federal Emergency Management Agency, 1987b, Flood Insurance Study, Town of Colchester, Delaware County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1987, 16 p.

Federal Emergency Management Agency, 1987c, Flood Insurance Study, Town of Highland, Sullivan County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1987, 14 p.

Federal Emergency Management Agency, 1987d, Flood Insurance Study, Town of Glenville, Schenectady County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1987, 18 p.

Federal Emergency Management Agency, 1987e, Flood Insurance Study, Town of Cochecton, Sullivan County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1987, 14 p.

Federal Emergency Management Agency, 1987f, Flood Insurance Study, Town of Unadilla, Otsego County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1987, 15 p.

Federal Emergency Management Agency, 1987g, Flood Insurance Study, Village of Unadilla, Otsego County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1987, 13 p.

Federal Emergency Management Agency, 1988, Flood Insurance Study, Town of Walton, Delaware County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1988, 14 p.

Federal Emergency Management Agency, 1990a, Flood Insurance Study, Town of Hancock, Delaware County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1990, 22 p.

Federal Emergency Management Agency, 1990b, Flood Insurance Study, Village of Hancock, Delaware County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1990, 13 p.

Federal Emergency Management Agency, 1991a, Flood Insurance Rate Map, Village of Newport, Herkimer County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1991, 1 p.

Federal Emergency Management Agency, 1991b, Flood Insurance Study, Village of Walton, Delaware County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1991, 14 p.

Federal Emergency Management Agency, 1992a, Flood Insurance Study, Town of Barker, Broome County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1992, 16 p.


Federal Emergency Management Agency, 1992b, Flood Insurance Study, Village of Windsor, Broome County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1992, 14 p.

Federal Emergency Management Agency, 1992c, Flood Insurance Study, Village of Afton, Chenango County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1992, 15 p.

Federal Emergency Management Agency, 1993a, Flood Insurance Study, Town of Colesville, Broome County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1993, 15 p.

Federal Emergency Management Agency, 1993b, Flood Insurance Study, Town of Rockland, Sullivan County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1993, 18 p.

Federal Emergency Management Agency, 1993c, Flood Insurance Study, Village of Bainbridge, Chenango County, New York: Federal Emergency Management Agency, Federal Insurance Administration, 1993, 12 p.

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For additional information write to:New York Water Science CenterU.S. Geological Survey425 Jordan RoadTroy, NY 12180

Information requests:(518) 285-5602or visit our Web site at:http://ny.water.usgs.gov

Suro, Firda, and Szabo—Flood of June 26–29, 2006, M

ohawk, D

elaware, and Susquehanna River B

asins, New

York—Open-File Report 2009–1063

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Flood of June 26–29, 2006, Mohawk, Delaware and Susquehanna ...

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