Idaho Water Supply Outlook Report | April 13, 2017 | Idaho Water Supply … · 2017. 4. 13. ·...

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


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

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... ~

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~ ~ I

3: T'""I m

0

... 'C

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E

('ti Q

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c::::: D

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""C ·- (I) C

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cc u

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... 0 >

t; ·-er.:: ·-

~

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( cc 0 ~

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+,J

cc

0 u...

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0

Surplus Above

???

Big Lost River Basin SWSI Adequate Water Supply Greater than 0.8 SWSI or 180 KAF


13127000 Big Lost R blw Mackay Reservoir

13126000 Mackay Reservoir

ENSO Classification


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


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%


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


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


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%



3 1986 N 6054 962 7016 92%


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%


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 , "

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•= . A /\, '"''' '-~ ~ '-- V I Y .., ""'U I I f ., I • j w ~ ,-.-----.---·,.. • ~ - . l 1. Ii'.. - I __ ••• ------ - - ~

j '- '"" ~ ' - - -------· ' ~ - ~ ----------= ·-------------.:------------'"'

..-CX>IONO)

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13082500 id: goose creek ab trapper creek nr oakley id

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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

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