2017 Idaho Snowpack and Water Supply Outlook
NRCS - Idaho Snow Survey
Danny Tappa & Ron Abramovich
April 1 vs. March 1 Snowpack·~er,~ent of Median Snowpack
March 1, 2017 ~
Basin-wide Snow \Nater Equiv1lanl as a Percentage of the 1981 to 2010 Median
Above
l " Median &T,
Below
>·= 150%
130-149%
110 - 129'½
90. 109%
70-89¼
!;().!'IC)%
0-49%
L_, NoData Provisio1wl Dilla · Subjed to Revision
200 -=-:::::i----=====----r,1;1.,. 0 25 50 100 150 Thi:.; 1n.11: :.; 1,·c.n .111;J l•V 1111: USOl.-1\P..CS l•_t·IK• S111.1w -~( ·w,y Olli~:,; ..,.
IIU·,.,~\vi.w. 111,;:.;.1,;;·J:.1.!_;ov.1vq ,:;.'i:11; ·1u l1r··c.-'mu9i,· ·1':..·tc.•'o\.'1
Percent of Median Snowpack April 1, 2017
Btssir1-w,t1e Snow \1\1'.,;ler Equiv lanl as a P~rcentage of the 1981 to 2:'.110 Median
Above ;,- 150%
J 130- 149% 110 -123'½ Median 90-109% '"r 70-89% 50-69% Below :J -49'>6
No Dat3
2~0 -c:::i-=----=====----•Mi'es 0 25 50 100 150
This rupir. prepue:J by : -.e USOA-NRCS lcth? 3n0\~: Su v~:;Office. 1•1::1~:•wvrt>: 111~ .u~a.'J:J';'n1::.'J/.>1 .a.1!ri11,n 1·1t ·wid,.J.·'J'N,'
•
I
Monthly & Water Year Precipitation
USDA 9:z7j
25 50 100
Monthly Precipitation March 2017
Monthly Precipitation as a Percentage of the 1981 to 2010 Average
Above >= 150%
t 130-149% 110 -129% Average 90-109%
·=r•tioo 70-89% 50-69%
Below 0-49%
LJ No Data Provisiona( Data - Subject to Revision
150 200 Miles
This map is prepared by the USDA-NRCS Idaho Snow Survey Office. http:/N.ww.nrcs.usda .gov/wps/po rta Vn rcslm a il'\1id/snow/ Copyright:@2014 Esri
USDA 9:z7j
25 50
Water Year to Date Precipitation April 1, 2017
100
Basin-wide Water Year Precipitat ion as a Percentage of the 1981 to 2010 Average
Above >= 150%
t 130-149% 110 -129% Average 90-109%
p"l"'"oo 70-89% 50-69%
Below 0-49%
LJ No Data Provisional Data - Subject to Revision
150 200 Miles
This map is prepared by the USDA-NRCS Idaho Snow Survey Office. http://v1WW.nrcs.usda.gov/wps/po rta Lin rcslm a il\1id/snow/ Copyright:© 2014 Esri
Precipitation Records
water Year to Date
Precipitation Records (POR) October 1, 2016 through
April 9, 2017
- Highest
~ 2nd Highest
~ 2nd Lowest
- Lowest Sites w ith less than 20 y ears of data
or low variability ex cluded
/'\ N R(S Natural Resources ~ Conservation Service Oeate:d 4-12-2017, 03:53 PM MST
1100 km 100 mi
Boise WY PrecipitationBoise Basin 2017 Precipitation Comparison Graph (8 sites)
Based on Provisional SNOTEL data as of Apr 10, 2017
- - Average --WY1983 --WY1997 --WY2011 -WY2017
60 Curre~t as Pct of Avg: 64% I Curre1t as Pct of Avg j"" Tot, I: 124 1
- so V)
CIJ ..c: u C:
c: 40 -0 :p ~
:!: C. u ~ 30 a. CL> -~ C
I
~ 20 -... ~
~
10 -
0
+ + + +
----
s ~ atural Res urces qonservatio Service
1-Oct 1-Nov 1-Dec 1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep
Boise WY PrecipitationBoise Basin Annual Precipitation Summary
Based on Provisional SNOTEL data as of Apr 10, 2017 '°' NRCS Natural Resources Conservat ion Service
60 ~------------------------------------------------------
so +--------------------------------
40 +----
-VI ~ .c ... ~ C .!230 +----.. ~ ·a. 'ij
~ C.
20 +----
10 +----
O +----
WY2017 WY2011 WY1997
Annua l Precipitat ion YTD Precipitation - Average YTD Precipitation - Average Annual Precipitat ion
Boise Basin Snowpack
40
35
'-
~ 15 ~ ~ 10 C
V)
5
0
Boise Basin 2017 Snowpack Comparison Graph (10 sites) Based on Provisional SNOTEL data as of Apr 11, 2017
- - Normal - WY1983 - WY1997 - WY2011-WY2017
Current as Pct of Normal: 143% Current as P4 of Peak: 142% Normal Peak Date: Apr 03
\ \
\ \ \ \ \
'°' NRCS Natural Resources Conservation Service
2016 is a strong El Nino, as were 1992 & 1998.
2D.15_was a weak_EJ Nina
\ \
\ \
' 1-Oct 1-Nov 1-Dec 1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep
March SWE Change
-(II cu ~ u C -cu IIJ) C n, ~ u w ~ V,
20.0
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
4000
•
Salmon & Central Mts March SWE Change
•
• • •
• • • • • • • • • • • • ••
•• I • • • • • • • • • •
• •
5000 6000 7000 8000 Elevation (ft)
•
• • •
• • • •
9000
Wood Basin Snowpack
35
30
-Cl'l i 25 u C ·--~ ~ 20 -
5
0
Big Wood Basin 2017 Snowpack Comparison Graph (9 sites) Based on Provisional SNOTEL data as of Apr 11, 2017
- - Normal - WY1983 - WY1997 - WY2011 -WY2017
Current as Pct of Norrrial: 178% Current as P~ of Peak: 173%
+
.. , ' '~
\ \ \ \ \ \
\
'
+-
~
'°'NRCS +
Natural Resources Conservation Service
1-0ct 1-Nov 1-Dec 1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep
Wood Basin Snowpack
Wood & Lost March SWE change
12.0
10.0 •
8.0 • 6.0
cii' • I) • • ~ 4.0 u C: • • • - • I) 11.0 C: 2.0 • • Ill ~ • u
0.0 • w • ;: • • V) -2.0 • •
• -4.0 • • •
-6.0 • •
-8.0
5000 6000 7000 8000 9000 10000 Elevation (ft)
Water Supply Forecasts
Spring and Summer Streamflow Forecasts as of April 1, 201 7 Percent of 1981-2010 Average
e > 180
• 150 - 100 • 130 - 149 C 110 - 129
• 90 - 100 0 70 - 89
0 50 - 69
• 25 - 49 • < 25
OSDA ~
Water Supply Forecast April 1, 2017
F:.i·acci~1a
Water Supply Forecasts
Spring and Summer Streamflow Forecasts as of April 1, 2017 Percent of 1981-2010 Average
• > 180
• 150 - 180 • 130 - 149 0 11 0 - 129
• 90 - 109 0 70 - 89
0 50 - 69
• 25 - 49 • < 25
50% exceedance --...: probability forecasts shown
~~~~~~~s;~~:f,fues,• " see inctviOJal state reports. \
Prepared by: USDA Natural Resources Conseivation Service National Water and Oirnale center Portland, Oregon h1tps:l/www.wcc.nrcs.usda.gov Cre a te d 7 Apr 201 7 00:23
Water Supply Forecast April 1, 2017
Forecasted A p ril to July Flow as a Pe rcenta ge of th e ·1981 to 2010Average
Above • '> 180% A,or ... 150 - 179% ~ 130 - 149% L::,. 110 - 129%
Aver;;,ge • 9 0 - 109% Forecast v 70 - 89% v 50 - 69 % T 2 5 - 4 9%
Below T Average 0-24% ( ) No Data
F>rovlslonttl Data • Sul,/ect fo ne-vhl/J
25 50 100 1 50 200 -c::=--==----•====•---• \;lilcs This map is prepared by the USDA-NRCS Idaho Snow Surv ey Offtee. twfp·f!WW\" ntr.!': t l !V'I,. ()O'"·'-'p~pn rt,i l,'nrr:s;./rru;tj r,.'ifl/s>.now! Copyr ight\¥- 2.01 ;;i Esri
IDAHO SURFACE WATER SUPPLY INDEX (SWSI) April 1, 2017 Agriculturcal Wate.r
M,ost Recent· Year Supply Shortage SWSI With Similar SWS'I May 10ccur When
BASIN or REGION Value Value SWSI is Les·s Than
Spokane 1.4 1'9196 NA Clearw·ater 1.8 2009 NA
Salmon 3.0 1'9199 NA Weiser 1.8 1919.5 NA Payette 3.8 1'9196 NA Boise 4.0 1'9183' -2.0
Big ·wood 4.0 1'9183' 0.3 Little, w ·,ood 3.'9 1'918.a -1.5
Big Lost 3.2 1'919,5 0.8 Little Lost 3.6 1'9195 1.5
Teton 2.7 1'91816 -3.9 Henrys Fork 2.7 1'9199 -1.7
Snake (Heise) 3.6 2011 -1.7 Oakl,ey 3.2 2006 0.1
Salm1,on Fans 3.6 2011 -0.8 Bruneau 3.2 2006 NA Owyhee 3.1 1'9198 -2.6
B,ear River 2.4 201 1 -3,.9
Surplus Above
2,200 KAF
Boise Basin Surplus = 2,200 KAF with a flow > 6,000 cfs passing the Glenwood gage for more than 5 days and approaching 25 days.
35D)
.-. t, 3000 GJ
LI. I
GJ 1. 25,()0 u ((
g 2000 0 ~ ._,. Z 15,(X) a. a. ::::, ~ 1000 I,,.
GJ ..,
Apr 1 Histo,ri,c and Fo,recasted Surfa,ce Water Supply Boise, River Ba sin
D StreamFlow Apr-Sep
• Reservo,i r 31-Ma r
,,,,,,,,,., ... ~ ~ ~ ~ ~
- ~ ~ : ~ ~ ~ - - - - 1-------1 1---------------1 - 1-- -r- 7-------------1~ 1---------1 1-------~r..i.1---111'1 .. ,~r..i - ~ - ~ _
-~
- ~ ~ ~ : ~ ~ ~ ... _____ ........................ ------------.......... ---- ~ ~ ~ ~ ~ -- 1-------11----------- ---- ~ ------~~~ -~~-~ - ~ --~ ~ ~i-~ ~1-~ ,,,, ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
.. 1.,1 I.I
- -- -
-
-~ -
~ ~
- -- -- ------ -- ----- -- -- --------------
rel
~ 500 - ---------- - - ----- -- -- -------------- - - -
0 - I I I
I I I I
Years
Adequate
Irrigation
Supply
Above
1,50D KAF
Surplus Above 2,200 KAF
Boise River Basin SWSI
Station ID Station Name
13202000 BOISE RIVER NEAR BOISE, ID
13201500 LUCKY PEAK
13194000 ARROWROCK
13190000 ANDERSON RANCH
ENSO Classification
Adequate W at er Supply Greater than -2.1 SWSI or 1,500 KAF
Period Data Type Years
Apr-Sep st rm 1981-2016 31-Mar resv 1981-2016 31-Mar resv
31-Mar resv
1981-2016 1981-2016
SE St rong El Nino· EN Mild El Nino· N Neut ral · LN Mild La Nina· SL Strong La Nina
Streamflow + Non-Stream Flow Reservoir Reservoir Exceed a nee
Rank Year Enso Apr-Sep 31-Mar Sum Probability
2017 l O"A> Chance Exceedance Forcast LA 2760 676 3436 l OO"A> 2017 30% Chance Exceedance Forcast LA 2620 676 3296 99% 2017 50% Chance Exceedance Forcast LA 2530 676 3206 98%
1 1983 SE 2495 656 3150 97%
2017 70% Chance Exceedance Forcast LA 2440 676 3116 96% 2 1982 N 2460 516 2976 95%
2017 90% Chance Exceedance Forcast LA 2300 676 2976 93%
3 1997 N 2491 347 2837 92%
4 1984 N 2161 630 2791 89%
5 2011 SL 1965 785 2750 86%
6 1986 N 1881 831 2712 84%
7 1996 N 2066 574 2640 81%
8 2006 N 2162 404 2566 78%
9 1998 SE 1701 837 2538 76%
10 1995 SE 1887 536 2423 73%
11 2012 LN 1611 801 2412 70%
12 1999 SL 1838 538 2376 68%
13 1993 EN 1656 422 2078 65%
# of
Years
36 Units KAF
36 Units KAF
36 Units KAF
36 Units KAF
SWSI
4.1
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.3
3.0
2.8
2.6
2.4
2.1
1.9
1.7
1.5
1.2
Surplus above 350 KAF
Big Wood 350 KAF with 1,500 cfs release from the dam.
C.
(I)
V1 ~
~
:5 0 'CC E
!:ti (I)
~
i;/)
D >
-a. a. ::::, u, ... GJ .., m 3: GJ u m 't ::::, u, "'Ci GJ .., u, m M .... !:ti ~ I ,-t m .... ~ (I) if.I (I) i:i::: •
... Q C
u..
·;; "'Ci
m
CC
C
m
._ u
i ·-
~
... ·-Q
a:
.., (/} "'Ci
·-
Q
:c 0
~ ;:
a. bD
Surplus above 350 KAF
Big Wood River Basin SWSI
Station ID Station Name
13142500 Big Wood R blw Magic Reservoir
13142000 Magic Reservoir
ENSO Classification
Adequate Water Supply Greater than 0.1 SWSI or 275 KAF
Period Data Type
Apr-Sep strm
31-Mar resv
SE Strone El Nino· EN Mild El Nino· N Neutral · LN Mild La Nina· SL Strone La Nina
Streamflow +
Stream Flow Reservoir Reservoir
Rank Year Enso Apr-Sep 31-Mar Sum
2017 10% Chance Exceedance Forcast LA 795 186 981 2017 30% Chance Exceedance Forcast LA 735 186 921
2017 50% Chance Exceedance Forcast LA 690 186 876
1 1983 SE 747 114 861
2017 70% Chance Exceedance Forcast LA 650 186 836 2017 90% Chance Exceedance Forcast LA 590 186 776
2 1982 N 622 108 729
3 1997 N 605 118 724
4 2006 N 636 78 714
5 1984 N 545 149 694
6 1986 N 432 186 618
7 1998 SE 427 170 597
8 1995 SE 518 77 595
9 1999 SL 420 102 522
10 1996 N 351 161 512
11 2011 SL 322 111 433
12 2012 LN 238 185 423
13 1993 EN 355 38 393
14 1985 N 242 144 386
15 1981 N 153 146 299
16 2000 N 165 132 298
Years
1981-2016
1981-2016
Non-
Exceed a nee
Probability
100%
99%
98%
97%
97%
95%
95%
92%
89%
86%
84%
81%
78%
76%
73%
70%
68%
65%
62%
59%
57%
# of Years
36 Units KAF
36 Units KAF
SWSI
4.1 4.1
4.0
3.9
3.9 3.8
3.7
3.5
3.3
3.0
2.8
2.6
2.4
2.1
1.9
1.7
1.5
1.2
1.0
0.8
0.6
Big Lost Basin
l{USGS
45000
.. .. .. 40000 ... .. r..
" .. 35000 . .. .. .. r..
" 30000 ..
" r.. .... " "
25000
r.. .. 20000 " .. "' 15000
USGS 13126000 MACKAY RES NR MACKAY ID
Feb 11
2017
Feb 18
2017
Feb 25
2017
Har 04
2017
- Reservoir storage - Period of approved data
Har 11
2017
Har 18
2017
Har 25
2017
Rpr 01
2017
Rpr 08
2017
- Period of provisional data
~USGS USGS 13127000 BIG LOST RIVER BL MACKAY RES NR MACKAY ID
Feb 11
2017
Feb 18
2017
Feb 25
2017
Har 04
2017
Har 11
2017
Har 18
2017
Har 25
2017
Rpr 01
2017
Rpr 08
2017
6. Nedian daily statis tic (183 years) - Period of provis ional data - Discharge • Heasured discharge - Period of approved data
~USGS
-g 0
" ., ., '-., ... ... ., ., ... " .... .,,. ::,
" . t !a ~
" ., .... Q
USGS 13132500 BIG LOST RIVER NR ARCO ID 150 ~------------------------------~
100
50
0 I-------'--
-50 l-====----====----====----===== Har 25
2017
Rpr 01
2017
Rpr 08
2017
---- Provis i onal Data Subject to Re vi s i on----
A Hedian daily statistic (63 years) * Heasured discharge - Discharge
C.
QJ
Vl
... ~
C'CI
~ ~ I
3: T'""I m
0
... 'C
I: -~
E
('ti Q
J C
l) V
l .t=i
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c::::: D
•
>,
-a. C. ::, u, ... GJ +' m 3: GJ u m 't ::, u, ""C Cl) ~ m u Cl) ... 0 LI. C
""C ·- (I) C
m
m
cc u
... ·-
QJ
... 0 >
t; ·-er.:: ·-
~
::c ~
0 .....
... C. b
J) <
( cc 0 ~
(].) i:::::
+,J
cc
0 u...
~
::, ·.p ~
(].)
C"'
cc C
. >
(].)
tlQ
C.
0 a
'"C
. i:: ::,
..c 0
0
Surplus Above
???
Big Lost River Basin SWSI Adequate Water Supply Greater than 0.8 SWSI or 180 KAF
Station ID Station Name
13127000 Big Lost R blw Mackay Reservoir
13126000 Mackay Reservoir
ENSO Classification
Period Data Type Years
Apr-Sep strm 1981-2016
31-Mar resv 1981-2016
SE Strong El Nino · EN Mild El Nino · N Neutral· LN Mild La Nina · SL Strong La Nina
Streamflow + Non-Stream Flow Reservoir Reservoir Exceed a nee
Rank Year Enso Apr-Sep 31-Mar Sum Probability
1 1984 N 321 37 358 97% 2017 100-' Chance Exceedance Forcast LA 330 20 350 96%
2 1983 SE 296 31 327 95%
2017 30% Chance Exceedance Forcast LA 295 20 315 93% 3 1982 N 272 35 307 92%
4 1995 * SE 272 24 296 89%
2017 50% Chance Exceedance Forcast LA 275 20 295 88%
5 1986 N 239 38 277 86%
2017 70% Chance Exceedance Forcast LA 250 20 270 85% 6 1997* N 244 16 260 84%
7 2006 N 216 34 249 81%
2017 90% Chance Exceedance Forcast LA 220 20 240 80% 8 1998 SE 198 38 236 78%
9 1999 SL 196 30 226 76%
10 1981 N 176 44 220 73%
11 1996 N 171 37 208 70% 12 2011 SL 160 39 199 68%
13 1993 EN 169 27 196 65%
14 2009 N 166 29 195 62%
# of
Years
36 Units KAF
36 Units KAF
SWSI
3.9
3.8 3.7
3.6
3.5
3.3
3.2
3.0
2.9 2.8
2.6
2.5
2.4
2.1
1.9
1.7
1.5
1.2
1.0
Big Lost Basin Timing of Snowmelt Runoff4,400 4,000 3,600
3,200
;, § § ~ ~ .. > > " § < ~ ~ ~ "' i i i -, .., .., .., ..,
10-25-75-90
i::: ~ -;; -;; .., ..,
Lost-wood Divide (601) Idaho SNOTEL Site - 7900 ftl Stickney Mill (792) Idaho SNOTEL Site - 7430 ftl
40
35
30
25
20
15
10
5
14
12
10
e
6
4
2
- 2
-5 ------....... ----------------~ .._... ~s::,,' a.:' ~' _t,.-:".... ~J;:)..... ~f::::,..... "s:i' r:::rr:::," ..._y::," -v,;;:," ~?' a?" ~P" ~r:::,' t?" ~p" (\s:," '
Snake River nr Heise SWSI
Estimated Surplus above 6,800 KAF based on flow > 21,000 @ Blackfoot
Snake River Near Heise SWSI
Station ID
13037500 Snake River near Heise
13010500 Jackson Lake
13032450 Pal isades Reservoir
ENSO Classification
Station Name
Adequate Water Supply Greater than -1 .7 SWSI or 4,400 KAF
Period Data Type Years
Apr-Sep strm 1981-2016
31-Mar resv 1981-2016 31-Mar resv 1981-2016
SE Strong El Nino - EN Mild El Nino - N Neutral - LN Mild La Nina - SL Strong La Nina
Streamflow + Non-Stream Flow Reservoir Reservoir Exceedance
Rank Year Enso Apr-Sep 31-Mar Sum Probability
1 1997 N 7009 949 7958 97%
2017 100/4 Chance Exceedance Forcast LA 6920 999 7919 96%
2 2011 SL 6343 1493 7836 95%
2017 30% Chance Exceedance Forcast LA 6530 999 7529 93%
2017 50% Chance Exceedance Forcast LA 6260 999 7259 93%
3 1986 N 6054 962 7016 92%
2017 70% Chance Exceedance Forcast LA 5990 999 6989 91%
4 1996 N 5584 1314 6898 89%
5 1982 N 5772 1064 6836 86%
6 198] s£ SuuS 1/40 6748 84% 7 1984 N 5046 1654 6700 81%
2017 90% Chance Exceedance Forcast LA 5600 999 6599 80%
8 2009 N 4610 1759 6368 78%
9 1999 SL 4947 1311 6258 76%
10 1998 SE 4495 1632 6127 73%
11 1995 SE 4442 1041 5483 70%
12 2014 N 4594 864 5458 68%
n 700fi N 407fi 17fi4 S~40 fiS%
# of
Years
36 Units KAF
36 Units KAF
36 Un its KAF
SWSI
3.9
3.8
3.7
3.6
3.6
3.5
3.4
3.3
3.0
2.8
2.6
2.5
2.4
2.1
1.9
1.7
1.5
1.7
Surplus Supply Above 180 KAF
Apr 1 Histo,ri,c and Forecasted Surfa,ce, Wate,r Supply Salmo,n Falls Creek Basin
D StreamFlow Apr-Sep
• R,e sie rvoi r 31-Ma r -400 --r--_________________________________________ ..,_ _______ ___.
-i 350 GJ
LI. ~ 300 -+-----------------------------------------... u ~ 250 -----------------------------------,-
! 200 -+--------1 ,__ - - -1---------------------------------1- 1-----------ir..,---1~,.i't---i~
+I Q) Q) LL
I Q) ~ (.)
< 0 0 0 ~
Salmon Falls Reservoir End Of Month Storage Projection Based on Avera,ge
Distirbution of the Apr-Jul Forcasts 200 ~-------------------~
Full Rese oir 182,650 acre-feet 180
160
140
120
100
80
60
40
20
0 -+------+-----+------+-----+------+--------I
Jan Feb Mar Apr May Jun Jul
April 10, 2017
- 90% Forecast
- 70% Forecast
-50% Forecast
- 30% Forecast
- 10% Forecast
Blue 10% Forecast based on 2011 actual runoff amounts, still assumes average irrigation releases
Avg 20 30
Sallmon Fallis R.eservo11r End 1Of Month S:toragel IProJectio - IBasedl on Avera.ge
D st·rb11utii10 11n 10 1f t lhe Ap· .. ·.r-J II Forcasts 200 ---------------------
140 +----------i--------f---, f:!:::, ~ ...,- .... ._;~ , ~ .. G)
11f 120 -+------+--------ti----, I
G) u 100 -a-----+---9ill~ 1c(
401 -,II-----+----~
r.n u. u ~
Blue 10% Forecast based on 1975 actual runoff amounts, still assumes average irrigation releases
0 0 0 T""
Salmon Falls IReserv,oir End Of Month Stora,ge Projection Based on Average
Distirbuf'on ,of the Apr-Ju f ,orcasts 200 --,--------r-----,----------.----------,-------.-------,
13105000: Salmon Falls Ck near San Jacinto, NV f.J. N R(S 1975 Apr-Jul volume was 208%, 142.6 KAF, Average is 68.5 KAF ~
2,400 ,-----,-----'---,------'--,-----,---'--.--i'i,....------,
2,200
2,000
1,800
II) 1,600 LL 60 -+-------::i,__---+------+-1~ 1,400 ~ 1,200
~ 1,000
4,0 -+--------+----- ::;; 800 600 I
20 -------
400
200
10-2~7~90
0---------------------Jan Feb Mar Apr May ,Jun Jul
RC
April 10,, 2017
2011 1975
April May 36.3 58.6 11.8 63.7
--90% !Forecast
--70% !Forecast
--50% !Forecast
--30% !Forecast
--10% !Forecast
June 37.7 52.3
July Apr.Jul ,. 10.9 143.5 ,. 14.9 142.6
90 85 80 75 70
+I 65 Q) 60 Q)
LL 55 I 50 Q) - 45 (.) < 40
0 35 0 0 30 ~ 25
20 15 10 5 0
Oakley Reservoir End of Month Storage Projection
+------1Note: reservoirs losses are evaporation, seepage and +------1releases, and are an average of all years. In wet years,
April 10, 2017
--F orec as t to Fill
--10% Forecast
--30% Forecast
--50% Forecast
--70% Forecast
runoff does not follow average conditions and often flows +------1are much above average for one or two months. 1--------i --90% Forecast
C: tl:s -, I ~
M
J:'l Q)
LL I
00 N
-Q. ~ 0 M
C ~
7 0 M
-~ NRCS
Natural Rt'Sovrces Con servotion SNvice
Bostetter RS SNOTEL 7,500 ftDaily Minimum Temperature
Mar 1 to Apr 12, 2017
32 F
2,400
2,200
2,000
1,800
Cl) 1,600 u. u ~
1,400
1'13 1,200 0 C: 1,000 1'13 Q)
:ii: 800
600
400
200
0
1,000
900
800
700 Cl) u.
600 0 ~ 1'13 500 0 C:
400 1'13 Q)
:ii: 300
200
100
0
13105000: Salmon Falls Ck near San Jacinto, NV 2009 Apr-Jul volume was 138%, 94.6 KAF, Average is 68.5 KAF - \ I \ V I -
\ --I
-\ --I -I -
A \ -
' I\ \
--I I\ I\ --
-- ~ • I I\ I \ \ A I~ \ I / y \ v\ -
-A rA- I \IV bL ~ --I' \I - I\ A1 Af • \ -~ 1,.1 }\ J , "
·- A
•= . A /\, '"''' '-~ ~ '-- V I Y .., ""'U I I f ., I • j w ~ ,-.-----.---·,.. • ~ - . l 1. Ii'.. - I __ ••• ------ - - ~
j '- '"" ~ ' - - -------· ' ~ - ~ ----------= ·-------------.:------------'"'
..-CX>IONO)
..c..c..-NN Q) Q) ..c ..c ..c u. u. Q) Q) Q)
u. u. u.
CD M O l'--c: ..- N N :::, C: C: C:
"") :::, :::, :::, "") "") "")
13082500 id: goose creek ab trapper creek nr oakley id
J"\ \
\_
I L ~JL A
j \j
"'_j Ir
/. ' ~ \ ~ , ""="" .... -~ --+---+---+--*--J\\-1 I l\.,..,___,y' I / ... -.. \ "" \ \. i\ \.lrU , " ~ ~ ... ._
i-:\1til~11Jrt11i/1 1~ ~ ~ ~ --....+--+--+-'I , ~ I/ LJ:..• ' , .- ~j • ::., .. - .J. ... .,...- ______________ , ••••• ,--------- --- ---- ...._
......... ~ -.. -............... __________ _ -------------------
0 CD M M ..c .... C: Q) ..c (II u. Q)
"") u.
'9,NRCS 1 0-25-7 5-90
c:::::::J Estimated
- s imilarYr
-- Last Yr
- Projected
- current
------- Med ian
--Max-Min
Updated
11-Apr-17
Similar Year
2009
'°'NRCS - 10-25-75-90 - Norrn75 - Norrn25
Norrn10 =Estimated - SimilarYr -- Last Yr - Projected - current ------- Median --Normal --Max-Min
April 13, 2017
Bostetter R.s. (359) Idaho SNOTEL Site - 7500 ftReporting Frequency: Daily; Date Range:
45
40 ,. ..
35 ..
30
25
20
15
10
Time
13181000: Owyhee R near Rome, OR 1996 Apr-Jul volume was 106%, 363.5 KAF, Average is 343.5 KAF '°'NRCS
18,QQQ +--+-A-+-l--t-hf\-1-1-l--+-IH-t--+--+--f----tf--H-l--+-t---,--t,----\--+---+--l--+-+-l 10-25-75-90
=Estimated 16,000 +---+-tH -+-1-----tH-+---,11H-+-+1-+-t-1----tt--f-----t1---+-1t---+-L.-t-1-+---+--A---+-+-1 - Sim ilarYr
--Last Yr 14,000 -tt---+11--11-++--tt--H+H--H+- lH----HcH-l--,'-tt------t--+----+--1+----tt-t-->--t-t--+---H - Projected
~ 12,000 ++---+11--+-++--+--½-Ht---+--+---+-----tf--+---+-----t--+----+---H\-+-tt--t--+-+-+---H - current 0 ------- Median
~ 10,000 --Max-Min iii C C: m Q)
:i:
C/) LL u ~ n, C C: n, Q)
:l:
C0 It) ..a ..... Q) ..a u.. Q)
u..
13181000: Owyhee R near Rome, OR
Updated
13-Apr-17
-1996 Apr-Jul volume was 106%, 363.5 KAF, Average is 343.5 KAF 8,000 --,------,---.......--'---.-------,----,------r----,------r--"---,-----,---,---.---,-,1
6,000
5,000
4,000
3,000
2,000
1,000
, , ,--' ,--, ,,-... __ , ... ___ ,
... , ,----'
N N ... ca
:E
N ..... ... C.
Snow to Flow Relationshipsthat should be
Operational in 2017
• Moyie River at Eastport ID • Lochsa River nr Lowell ID • Selway River nr Lowell ID • MF Salmon River at MF Lodge ID
• Boise River nr Twin Springs ID • SF Boise River nr Featherville ID • Big Lost River at Howell Ranch ID
• Bruneau River nr Hot Springs ID • Owyhee River nr Rome ID • Salmon Falls Creek nr San Jacinto
• Teton River nr Driggs ID • Snake River at Flagg Ranch WY
Partnerships between NRCS & BSU
16
14
12
10
-C: UJ 8
s U')
6
4
2
0
1 -Oct
BOISE STATE UNIVERSITY
max accumulation -..._
..... ---peak streamflow
--SWE
--strea mflow
x melt-out levels - 10% increments
accumulat ion
20%,...._------lf-' I
ablat ion
40%
I
80% I
90%D 100%
1-Nov 1-Dec 1 -Jan 1-Feb 1-Mar 1-Apr 1 -May 1 -Jun 1-Jul 1 -Aug 1-Sep 1-Oct
5000
4500
4000
3500
-U') 3000 u.. u
3 2500 0
~
E ro
2000 QJ ~ ~ V)
1500
1 000
500
0
2017 Idaho Snowpack and �Water Supply Outlook���NRCS - Idaho Snow Survey��Danny Tappa & Ron Abramovich�April 1 vs. March 1 SnowpackMonthly & Water Year PrecipitationPrecipitation RecordsBoise WY PrecipitationBoise WY PrecipitationBoise Basin SnowpackMarch SWE ChangeWood Basin SnowpackWood Basin SnowpackSlide Number 1120170413-NRCS-Idaho-Water-Supply-Outlook-Report2.pdfSlide Number 1� IDAHO SURFACE WATER SUPPLY INDEX (SWSI) April 1, 2017 Slide Number 3Slide Number 4Slide Number 5Slide Number 6Slide Number 7Slide Number 8Slide Number 9Slide Number 10Slide Number 11Slide Number 12Slide Number 13Slide Number 14Slide Number 15Slide Number 16Slide Number 17Slide Number 18Slide Number 19