File: k:\water resource eng\adams county\friendship dam\2018 grant app with dfa\orip\2018-02-20l_behlen.docx 3433 Oakwood Hills Parkway ● Eau Claire, WI 54701-7698 ● 800.666.3103 ● www.AyresAssociates.com February 20, 2018 Joe Behlen, Dam Safety Engineer Wisconsin Department of Natural Resources Wisconsin Rapids Service Center 473 Griffith Avenue Wisconsin Rapids, WI 54494 Bob Berry, Chairman Friendship Lake District 404 Hillwood Lane Friendship, WI 53934 Re: Friendship Dam inspection, FF 1.01, KSN 00062 Dear Mr. Behlen: Ayres Associates was retained by Friendship Lake District to conduct an inspection of Friendship Dam (FF 1.01) on February 13, 2016. A follow-up embankment survey was completed on February 16, 2013, following a snowmelt. We have attached the original inspection report as well as a compact disk with photographs and the scanned inspection report. The dam in in fair condition, and we recommend maintenance as noted below. Action Reason Deadline Add two benchmarks on the dam that are correlated to the original project datum and to the current Flood Insurance Study Datum. The only benchmark found on the site was the STH 13 bridge BM. This was also the only BM found during the last ORIP. December 31, 2019 Replace the staff gauge with a legible one. Staff gauge is illegible. December 31, 2019 Install OSHA-approved fence along the 16 ft high tailrace walls to prevent public from walking off top of wall Fall height greater than 6 feet and public is able to access this area on both sides December 31, 2018 Investigate flows and provide new flow capacity because the dam cannot pass the Q500 or Q1000 floods. The estimated hazard rating is Significant but could be High due to cabins in the floodplain. FIS Q100 is 1335 cfs below the dam. Ratioing the FIS flows at CTHZ to STH13 yields an estimate of 2033 cfs for the Q500 and 2610 cfs for the Q1000 at the dam. Capacity is currently only 1522 cfs. December 31, 2018 Add riprap to design pool (top of embankment) and make upstream slopes stable for riprap Riprap does not extend to top of beaching areas of upstream embankment. December 31, 2019 Monitor embankment movement, ideally by installing one survey pin in each of the two movement areas Powerpole (abt 15 deg lean) and bridge abutment (2.5 inches of displacement) indicate bank movement December 31, 2018 and thereafter during ORIPs
Transcript
File: k:\water resource eng\adams county\friendship dam\2018 grant app with dfa\orip\2018-02-20l_behlen.docx
February 20, 2018 Joe Behlen, Dam Safety Engineer Wisconsin Department of Natural Resources Wisconsin Rapids Service Center 473 Griffith Avenue Wisconsin Rapids, WI 54494 Bob Berry, Chairman Friendship Lake District 404 Hillwood Lane Friendship, WI 53934 Re: Friendship Dam inspection, FF 1.01, KSN 00062 Dear Mr. Behlen: Ayres Associates was retained by Friendship Lake District to conduct an inspection of Friendship Dam (FF 1.01) on February 13, 2016. A follow-up embankment survey was completed on February 16, 2013, following a snowmelt. We have attached the original inspection report as well as a compact disk with photographs and the scanned inspection report. The dam in in fair condition, and we recommend maintenance as noted below. Action Reason Deadline Add two benchmarks on the dam that are correlated to the original project datum and to the current Flood Insurance Study Datum.
The only benchmark found on the site was the STH 13 bridge BM. This was also the only BM found during the last ORIP.
December 31, 2019
Replace the staff gauge with a legible one.
Staff gauge is illegible. December 31, 2019
Install OSHA-approved fence along the 16 ft high tailrace walls to prevent public from walking off top of wall
Fall height greater than 6 feet and public is able to access this area on both sides
December 31, 2018
Investigate flows and provide new flow capacity because the dam cannot pass the Q500 or Q1000 floods. The estimated hazard rating is Significant but could be High due to cabins in the floodplain.
FIS Q100 is 1335 cfs below the dam. Ratioing the FIS flows at CTHZ to STH13 yields an estimate of 2033 cfs for the Q500 and 2610 cfs for the Q1000 at the dam. Capacity is currently only 1522 cfs.
December 31, 2018
Add riprap to design pool (top of embankment) and make upstream slopes stable for riprap
Riprap does not extend to top of beaching areas of upstream embankment.
December 31, 2019
Monitor embankment movement, ideally by installing one survey pin in each of the two movement areas
Powerpole (abt 15 deg lean) and bridge abutment (2.5 inches of displacement) indicate bank movement
December 31, 2018 and thereafter during ORIPs
File: k:\water resource eng\adams county\friendship dam\2018 grant app with dfa\orip\2018-02-20l_behlen.docx
Embankment has low area near sheetpile and near leaning power pole
December 31, 2019
Regularly monitor for rodents and burrows
Dams with design pools at the embankment crest are very susceptible to piping via burrows
At least monthly May to Sept, every year
Regularly monitor toe seepage for sediment passage and changes in color or clarity
Toe ditch below STH13 was seeping with iridescence (biological indication) in winter. More expected in spring/summer.
At least monthly May to Sept, every year
Repair deteriorated concrete areas (upstream and downstream faces of dam)
Some areas deteriorated to 12 inches deep. Section loss may be severe enough to lower strength.
December 31, 2019
Paint gate and check chain strength
Chains rusted and gate is unpainted on upstream face. Gate and chain will quickly rust through if not painted.
December 31, 2019
Deice the gate arms and make ready for spring flood passage
Only one gate (no redundancy) so high risk of gate inoperability
April 15, 2018 and annually thereafter
Investigate provision of operator for lake drain
Dam lacks flow capacity and lake drain could add 10% flow capacity but lacks dedicated hoist
December 31, 2018
Remove jam from wicket gates and provide lubrication to unit
Turbine should not free spin without generator load
December 31, 2018
Replace trashrack 70% section loss in lower third December 31, 2019Monitor crack in NE wall of powerhouse superstructure, ideally with an Avongard gauge
Large crack in brick façade, could indicate water freezing within wall or foundation movement
December 31, 2018 and annually thereafter
Check roof for leakage Stains on interior of walls appear to be from rain entry
December 31, 2018
Investigate further the need top tuck point brick
Inspector could not see all brick but several areas appear to need tuck pointing
December 31, 2018
Fix broken doors and windows Secure building against animal and human entry
December 31, 2019
Clean trash rack Rack is plugged with debris, creating 24 inch differential which is too much for rack to handle
At least monthly May to Sept, every year
Investigate electrical compliance Inspector is not an electrician but old equipment appears to be not NEC compliant
December 31, 2018
Confirm that lake is still under drawdown order, pending compliance
DNR database indicates that drawdown order has not been lifted. Dam does not have Q500 or Q1000 capacity if lake is raised to normal pool. If drawdown order remains, coordinate compliance with DNR.
April 15, 2018
After years of non-compliance by the previous owner, this dam was just transferred to the Friendship Lake District, and the new owners look forward to completing the above as part of the municipal dam grant.
File: k:\water resource eng\adams county\friendship dam\2018 grant app with dfa\orip\2018-02-20l_behlen.docx
We appreciate the opportunity to assist the Department of Natural Resources with this dam safety inspection and look forward to answering any follow-up questions about this report’s conclusions. Sincerely, Ayres Associates Inc Peter E. Haug, PE Water Resources Engineer Direct: 715.831.7680 Cell: 715.271.1829 [email protected]
Friendship Dam Date:Pete Haug, Doug D'Jock, Bob Berry, Larry Swaziek F.F #:Friendship Lake Association Key Seq #: 404 Hillwood LaneFriendship, WI 53934AdamsOvercast, 31F, 4 inches of snow cover Email: [email protected]
Item N P M I R1 Monuments/Benchmarks X 1 3
Location: Elevation:
Datum:See below for missing benchmark on dam
2 Pool Level X 3Normal/Operating:
Maximum:Minimum:Staff Gage X Staff gage is not legible
Dam is under drawdown order dated 7/7/2016 until inspection directives met
On upstream face of powerhouse
Name of Dam: Inspectors: Owner's Name: Street:City, State, Zip Code:
2/13/201801.0100062
STH 13 is on dam, parking lot is south of powerhouse
None approved for this damNone approved for this dam
933.54 NAVD88 as measured today during drawn down conditionNormal listed at 937.49 NGVD29 per DNR database (937.39 NAVD88)
Action
Notes/ Observations
Owner's Phone: 608-548-2191 Cell
F.F.= Field File; RT = Right; LT = Left U/S = Upstream; D/S = Downstream
Drainage basin = 60 square miles
DNR requires one benchmark on dam and one off dam (possibly old BMs lost?)
3. Do when convenient
Friendship Dam
16' fall - Left downstream tailrace wall (upstream of bridge)16' fall - Right downstream tailrace wall (upstream of bridge)
The WisDOT BM qualifies as one BM off dam
5 Hazard SectionA. D/S Development X 3
Density:Distance:
Type (Residential, Commercial,
Industrial): B. Channel Crossing X
Type:Dimensions:
D/S distance:Traffic Level (Local, CTH,
Rail Road, STH, Interstate, etc):C. Distance to nearest D/S Xcommunity/impoundment:
Name:
D. Anticipated Hazard (based Xon landuse and zoning):E. Dam Failure Analysis
Date Completed/Approved Not completed. Ayres is under contract to complete this by April 2018.Is map available?
Are map & profile adopted?List adoption date:
Verify validity of failure mode:
Verify validity of DFAconclusions:
F. Emergency Action Plan Y N M I R1. Current plan posted? x Ayres is under contract to complete this by April 2018.2. Understood by Operator? x3. Warning systems? x4. Certification of last test? x5. Remote operation? x6. Revision Date? x7. Habitable structures? ? Possibly. 20+ homes surveyed on 2/13/2018 to check LAG.8. Recreation areas? x Friendship park is 0.07 mi D/S9. Changed hazard potential? x10. New development? x11. Other comments? X Dam barely passes existing Q100 flowrate; cannot pass Q500 or Q1000 1 1
2. Plan to do soon
F.F #: 01.01 Date: 02/13/18 Page 2 of 11 Dam Inspection Checklist
Friendship Dam
GENERAL (Cont.)
Photo shows cabin that is <5 feet above normal river waterMultiple small cabins 4mi D/S are 1 acre lots and within 5 vert. ft. of river4 miles downstream, just below CTH J bridge P-01-0903Residential
U/S = Upstream; D/S = Downstream
FIS flowof 1335 cfs seems very high for this basin, likely a result of an uncalibrated HEC watershed model. A USGS gage comparison nearly halves the Q100 from the FIS 1335 cfs value. The Friendship Lake Stillwater FIS value of 936.9 must take credit for powerhouse flow. The embankment sheet pile is about 2 feet lower than the top of spillway deck. In 2017, the HW reached 939.49 and downstream discharges exceeded 1300 cfs as confirmed with a HECRAS model using high water marks downstream in the park. However, gate opening is not known for this condition. The right abutment overtops at HW = 940.79. The low level sluice can provide 200 cfs of additional outflow capacity, but it lacks a dedicated hoist and so cannot be counted toward flow capacity.
If the hazard estimate is correct, the dam should be able to pass the Q500 as a significant hazard large dam. The dam cannot pass the existing-interpolated (FIS) Q500 without both a dedicated hoist for the sluice bay AND raising the earthen embankment.
Multiple bridges downstream. STH13 B-01-17 prestressed concrete girder bridge at 0.01 mi D/S. Light Steel ped bridge in park 0.07 mi D/S. CTH N P-01-0046 timber trestle bridge 2 mi D/S. UPRR trestle bridge 4 mi D/S. 17th Court non-vehicular steel thru truss is 4.1 mi D/S. CTH J P-01-0903 timber trestle bridge is 4.2 mi D/S. CTH Z P-01-0904 timber trestle bridge is 6 mi D/S at confluence with Wisconsin River.
Straight-line the distance is 6.1 miles to Castle Rock Lake on the Wisconsin River
M I R
Item N P1 Vegetation: No problem
A. Trees X 4 3Quantity (<5,sparse,dense):
Diameter:Location:
B. Brush X 4 3Quantity (sparse,dense):
Location:
C. Ground cover XType (grass, crown vetch,other):
Quantity (bare, sparse,adequate,
dense): Appearance (too tall, too short,
good): 2 Erosion No problem Not applicable Could not inspect
A. Wave erosion (Beaching): X 5 3Scarp: Length/ Width:
Location:
B. Runoff Erosion (Gullies)Quantity:
Length/ Width/ Depth:Location:
3 Instabilities No problem Not applicable Could not inspectA. Slides X 5 3
Transverse:Longitudinal:
Scarp: Length/ Width:Crack Length/ Width:
B. Cracks: X 6 3Transverse:
Longitudinal:Length/ Width/ Depth:
Location:Other:
C. Bulges/ Depressions X 7 3Size:
Height/ Depth:D. Slope (Too Steep) X 2U/S, D/S
Action Suggestion 1. Requires immediate action 2 . Plan to do soon 3 . Do when convenient
Additional Comments:
Date: 02/13/18 Page 3 of 11
EMBANKMENTS
N= Noted; P= Photo; M= Monitor
Action
beaching is prevalent along entire upstream of dam. Riprap is at okay slope but there is
trees and woody vegetation to allow seepage monitoring.
Well established grass on slopes east of STH 13. Brushy riprap west of STH 13.
Location on Embankment and Deficiency
an 8- to 12-inch vertical section of embankment on upstream face above riprap.
densealong toe of embankment (west of STH 13) in toe ditch. Should clear toe ditch of all
None found
Friendship Dam F.F #: 01.01
too steep near D/S bridge abutments 1.8H:1V (2.2H:1V on average is still steep)
U/S = Upstream; D/S = Downstream
Low area near left end of embankmentSee survey notes
Description:
F.F.= Field File; RT = Right; LT = Left
none found, but it is difficult to inspect under grouted riprap near upstream of STH bridge
U/S slope is 1.3H:1V in places - too steep (1.9H:1V on average)
<5 along toe of embankment (west of STH 13)up to 8" DBH
Dam Inspection Checklist
No cracks found
Powerpole right of PH leans downstream. Mr. Berry claims it has leaned for 40 years.A low area was found on embankment right of PH
Toe ditch
No scarps found
Item N P M I R
4 Slope Protection No problem Not applicable Could not inspectA. Type (none, riprap, wave Xberm, concrete slabs, loose formed
concrete/asphalt):
B. Condition:
5 Other No problem Not applicable X Could not inspectA. Rodent burrows (few, many) 3
Location:B. Ruts 3
Length/ Width/ Depth: Location:
C. Other
6 Alignment No problem Not applicable Could not inspectA. Vertical X 7 3
Low area:Elevation Difference:
Location:
B. Horizontal
C. Width XToo narrow:
Location:7 Toe No problem Not applicable Could not inspect
Cracks/Slumps: 2Embankment drains:
Type/Flow:Location:
Seepage/ Wetness:Hummocky:
8 Seepage No problem Not applicable Could not inspectWet area: X south end of right toe ditch 3
Boil: none seenSinkhole: none seen
Aquatic vegetation: none seenRust colored deposits: X drain hole in right tailrace wall stained with iron bacteria
Other:Sediment in Flow: none seen
Flowrate: 1 gpm in right toe ditchLocation:
Action Suggestion 1. Requires immediate action 2 . Plan to do soon 3 . Do when convenient
Additional Comments:
Date: 02/13/18 Page 4 of 11
not hummocky, but certainly hydric soils
right toe ditch, increasing wetness with southward directiontoe ditch bottom was wet, some ice covered areas, some seeping water
Toe was seeping even after weeks of below Zero F temps1 gpm in ditch
Left end of embankment
snow cover obscured areas between riprap so this could not be inspected
The embankment increases in height to EL 940.79 at far right end of property
no obvious embankment deformity seen and embankment is generally straight
Too narrow, about 4 feet at narrowest
Two to three inch lower area about 63 feet north of north powerhouse wallEL 939.63 NAVD88 is lowest found crest pointJust north of powerhouse
Action
light riprap U/S slope; medium riprap D/S of STH 13
Notes/ Observations
EMBANKMENTS (Cont.)
U/S = Upstream; D/S = Downstream
N= Noted; P= Photo; M= Monitor
Friendship Dam F.F #: 01.01
A second trip was made to site on 2/16 after snow melt to check embankments
I= Investigate; R= Repair
Dam Inspection Checklist
F.F.= Field File; RT = Right; LT = Left
ActionItem N P M I R
1 Fixed Crest No problem X Not applicableA. Dimensions 8
Top Width:Crest Elevation:
B. Materials 8
C. Shape (sharp-crested,
broad-crested, ogee, chute, gated,
overflow, morning glory,
dropbox, labyrinth)
D. DebrisPrevention (racks, booms, etc.):
E. Concrete Condition * X 9 3
F. Flashboards (none, number):
Type (Metal, wood):Dimensions:Operability:
G. Abutments Condition: *
Seepage/wetness:
H. Drains No problem Not applicableType: Weep holes, Relief
drains, Other:________Flow Rate:
I. Other
Controlled = Gated
*
F.F #: 01.01 Page 5 of 11
The right training wall for the construction closure is severely deteriorated. Concrete ismissing from 30% of the upstream wall surfaces, up to 12 inches deep in a 29.5" thick wall.
Uncontrolled = Overflow
Could not inspect
U/S = Upstream; D/S = DownstreamF.F.= Field File; RT = Right; LT = Left
It appears that this concrete wall between the powerhouse and the embankment is a closure wall, used to divert the stream during
filled with concrete. The closure wall has been raised 18" since originally placed. A cold joint exists along the right side ofdam construction. On the downstream face of the wall, two angles used to allow timber stoplogs, but these angles are now
Additional Comments:
SPILLWAY--PRINCIPAL - FIXED CREST
overtopped, thus initiating dam failure.
See above notes
Type of Concrete Problems: Spalling, cracks, exposed rebar, misalignment, joints, bug holes, efflorescence, popouts,
Date: 02/13/18
photograph 8. This cannot be a fixed crest weir because overtopping of this wall would occur only when the embankment was
Dam Inspection Checklist
Action Suggestion 1. Requires immediate action
3 . Do when convenient
none found
N= Noted; P= Photo; M= MonitorI= Investigate; R= Repair 2 . Plan to do soon
Friendship Dam
honeycombing, scaling, craze/map cracks, isolated crack, disintegration, other
Notes/ ObservationsCould not inspect
Contrary to the 2016 inspection report, there is NO fixed crest concrete spillway. This is a concrete wall equal height to the embankment. This appears to be the construction closure.
n/a
Concrete wall 11.25" wide and 2 ft above adjacent grades. Slots for closure logs on D/S face
Action Item N P M I R
1 Gates No problem Not applicableA. Types (lift/slide, tainter(radial), X
stoplogs, leaf, roller,
flashboards, needles, other):
Number and Size:B. Stoplogs X 10
Dimensions:Condition:
C. Abutments X 8 3Condition: *
Seepage/wetness:D. Piers (number, shape) X
Condition: *E. Operability X 10 3
Type of Operator:Condition(chain, cables,hoists):
Security(locked?):Backup Operator:
F. Access X
G. Condition X 11 3Rust:
Seals (leakage): H. Ice protection X 11 1Type (Heaters, Bubblers, Barriers, Other)I. DebrisPrevention (Rack, boom, etc.)
J. Condition of Flowway X 12 3
K. Drains XType (Weep holes/ Relief drains/
Other):Flow rate:Location:
L. Other X 13 3
Controlled = Gated
*
F.F #: 01.01 Page 6 of 11
Type of Concrete Problems: Spalling, cracks, exposed rebar, misalignment, joints, bug holes, efflorescence, popouts,
2 . Plan to do soonF.F.= Field File; RT = Right; LT = Left 3 . Do when convenient
good, inside locked fence
rusted chain; hoist paint in fair condition
1 pointed parabolic nose with angle iron at tip
One 12 ft wide tainter gate
0
Downstream flowway has severe concrete deterioration
Weep holes in downstream walls have iron bacteria staining but no flow today
seals are flat flap seal and leak significantly (note ice rooster tail along side walls)
None. Ice has built up on gate to point that gate is no longer safely operable.
gate is unpainted on upstream side
Could not inspect
SPILLWAY-PRINCIPAL - GATES Notes/ Observations
Right downstream tailrace wall is 16 feet high and has signficant spalls.
Slots are 5.375 by 11.75 inches and 167.5 inches out to outokay but rough on sealing surface
moderate concrete spall with significant section loss at right U/S training wall end
Date: 02/13/18
NoYes, locked chain
manual chain drum hoist
45 deg. U/S training wall has 1:12 batter on each side; has 19" wide top
Some areas of walls have lost 6 to 12 inches of concrete and no reinforcement is seen.
Gate is sole flood passage method and must be deiced before spring floods arrive.
See spillway tailrace as this is a common structure for both flows
ActionPowerhouse/ Mill Building
Notes/ Observations
2016? Not generating currently but wicket gates jammed open (see below notes)0 now
headrace concrete appears in good conditionn/a
No visible cracks in headwall or headrace or turbine pit walls
F.F #: 01.01
I= Investigate; R= Repair 2 . Plan to do soon
Photo 18 shows upstream face of headgate. Gate is rusted and small portal gate has unknown purpose.
Additional Comments:
Some staining on walls, either from roof leak or brick seepage (check roof and tuckpoint)
3 . Do when convenient
Dam Inspection Checklist
N= Noted; P= Photo; M= Monitor
Trashrack is 30% plugged with ice and debris. Head on rack is >12" which is probably more than design load. Remove debris.
Headrace is 7 foot wide inside finish and has 4" slot for raising headgates downstream of trashrack. Two gates (side by side) and one gate has 12" round port gate in it (photo 18). Inspector was unsure of purpose for having two gates and portal gate.
There is an access hole in the NE corner of PH and a camera was sent down this to look inside turbine pit. Manhole grab rungs provide entry but this area was not entered by inspector (possible confined space). Instead a camera was sent down with light.
Woodward No. 21 Rotary Governor per nameplate. Wicket gates were set at 50% open, and previous dam owner told new owner that a log or something was stuck in the wicket gates so they cannot be closed. Running the turbine at no load and at drawn down conditions may create maintenance issues for bottom thrust bearings and any intermediate water cooled bearings (if applicable, could not see any with camera). New owner reports that oil reservoir for top bearing is loosing oil slowly, so this may be excaserbated by no load operation of unit. Remove jam in gates and consult mechanical expert about turbine lubrication requirement. Photo 17 shows turbine pit.
Electrical may still not meet current code, and electrical hazards may exist. Inspector is not an electrician, but owner should consider having electrical inspected and updated as required
Action Suggestion 1. Requires immediate action
U/S = Upstream; D/S = Downstream
1/2" crack in brick façade in NE corner near abandoned chimney - monitor crack width
F.F.= Field File; RT = Right; LT = Left
Concrete looks to be in good condition as viewed through camera on pole in turbine pitnone seengood
several windows and bottom of entry door are broken. Fix door and windows.
n/a
4" thick head gates are 78" tall and split into two gates side by side. Trashrack is 2" spacing of 1/4x3" steel plates. Bottom of trashrack has 70% section loss and will need replacement.
Downstream right bank abutment of STH 13 bridge over Little Roche A Cri. BM is not shown on WisDOT plans but is an embedded disk in top of concrete parapet wall.
Bench Mark Information (Location, Elevation, Datum):
939.49
933.54
933.25 Bridge deck at NE corner
Headwater (drawn down condition)
Tailwater
940.99
919.39
939.63 Low point of embankment crest
NAVD88
Overcast, 31F, 4 inches of snow cover
BM on STH 13 D/S RIGHT PARAPET935.75
941.53 Upstream deck of spillway gate
916.47
Top of sheet pile at left end of embankment
Tailrace Apron
Right end of embankment crest
Friendship Dam
RTK GPS with WISCORS
Date: 02/13/18 Page 11 of 11Dam Inspection Checklist
Friendship Dam F.F #: 01.01
SKETCH (NORTH IS UP)
BM‐‐>
Low Pt‐‐>
Low Pt‐‐>
<‐‐ FLOW
Friendship Dam
0006202131801.jpg
Permanent monument on bridge
Friendship Dam
0006202131802.jpg
Looking south at tailrace
Friendship Dam
0006202131803.jpg
One habitable structure likely in dam failure shadow (creek is 200 feet to left)
Friendship Dam
0006202131804.jpg
Looking north along toe ditch (seepage is in bottom left corner)
Friendship Dam
0006202131805.jpg
Looking south along upstream face of embankment
Friendship Dam
0006202131806.jpg
Looking north at displaced approach wall of bridge
Friendship Dam
0006202161807.jpg
Looking east at low spot in embankment (left quarter point of photo midline)
Friendship Dam
0006202131808.jpg
Looking at dewatered upstream of dam
Friendship Dam
0006202131809.jpg
Guide wall showing severe concrete deterioration at and below waterline
Friendship Dam
0006202131810.jpg
Looking downstream iced up spillway gate
Friendship Dam
0006202131811.jpg
Looking upstream at spillway gate (note ice in bottom right)
Friendship Dam
0006202131812.jpg
Looking down at powerhouse discharge works
Friendship Dam
0006202131813.jpg
Looking upstream at turbine discharge pit of powerhouse
Friendship Dam
0006202131814.jpg
Looking upstream at low level outlet in upper right of photo
