RECLAMATION _Afanaging ffi1ter in the H1est

2019 Water Supply Committee Meeting

April 11, 2019

Ryan Hedrick Middle Snake Field Office – Water Operations Boise Reservoir System

PROVISIONAL DATA - Subject to change

Boise Riv,er system (Anderson Ranch, Arrowrock, Lucky P,eak) is at 616 %, of capacity.

Total spaoe available: 319384 AF

To tall storage capadty: 949700 AF

Natural Flow: 13582 CFS Boise Reservoir System Apr-Jul Water Supply Forecast WY1983 to WY2019

2,500,000 1981-2010 Average Actual Apr-Jul Runoff = 1,261,000 ac-ft 2,000,000 WY2019 Apr-Jul Adopted Forecast 1,500,000 ac-ft ft) 1,500,000 119% of 1981-2010 average -

1,000,000 Volume (ac- Volume

500,000

0 II I 1997 2017 1983 2006 1984 1996 2011 1995 1986 1999 1998 1993 2012 2019 2008 1989 2009 2016 2018 2003 2010 2002 2014 2000 1985 2004 2005 1990 1988 2007 2015 1991 2013 1994 1987 2001 1992 Water Year -Apr-Jul Forecast - Average Actual Apr-Jul Runoff MOORES CREEK SUMMIT Elevaaon:6100.000

~ 2019 ~ 2018 ~ 2017 ~- avg

40------+------+------11------+---n--n~------+----- 38 364------'------'-----j____ _jl_ ___ ~ _,__ __l( ~--=.a------:----- 34 32t------+------+------t------jr---jr4r-i------:i==-- , ------30 28+-----'------'-----~------!~ r----l---~=----!------P ;....,,,_ ____ 26 24 +------+------...------:~1--- __,.,_,.r______+------1- ---- 22

·-C: 2QL______._ ____-'- ____...L_ _ _.jr--,C.::::::....___J.__ _L_ __ ~ __~ ~~---'--'-4--- 18 16 +------Y------1-----,------..------1----+---1---\-- 14 12+-----'------'----~=.,L--:Jr- -,==,;::-----+------!------1f---"---l----\-- 10 8+------+------+---T" "- l--~ '+---l '------!i-----+-----+-----~ ---\~-----\- 6 and +ark +luc +low Bevatlon:O.OOOOOOOE+OO

rt] • 2019 1]• 2018 rt] • 20 17~- avg

1,050,000

1,000,000

' 950,000 1

900,000 :

850,000 ' .u QJ 800,000 : ~ I QJ 750,000 I L u f1J 700,000 , '

Jun 1 Jul 1 12019-04-08 9194.94 Lucky Peak Lake near Boise, ID Elevation:3060.000

I 17,000

16,000

15,000 -

14,000

13,000 12,000 CalculatedCalculat ed InflowInflow 11,000

10,000

9,000 ~u 8,000

7,000 r

6,000

5,000 4,000 ,}'~ 3,000

2,000 ,..._ jvJ 1,000 A - ,..,. - ~ - : ~ v- ,_,.,.,, ' - i - -- ·- - -- ...... -- I - --- - ! ! ! I Oct 1 Nov 1 Dec 1 Jan 1 Feb 1 Mar 1 Apr 1 - 2019 Required~ - 2019 Actual

950,000 900,000 850,000 800,000 ------,------■ 750,000 700,000 650,000 600,000 ' • .µ 550,000 I■ a C 2 500,000 C o 450,000 u 400,000 350,000 300,000 250,000 I 200,000 150,000 I\ ■ 100,000 Represents current targets, SUBJECT TO CHANGE 50,000 0 * I I Oct0l Nov0l DecOl Jan0lI •11 . I 11 I . I I I Anderson Operations

• Currently discharging 600 cfs

• Increases likely to occur as inflows rise to meet flood control rule curves

• Expecting increases in the next few weeks but could possibly change depending upon runoff and reservoir conditions downstream and Reservoir Bevation:3880.000

~- 2019 ~- 2018 • 20 17 ~- avg

410,000 400,000 390,000 380,000 370,000 ' 360,000

350,000 I 340,000 330,000 ,I.I ~ 320,000 ~ 310,000

~ 300,000 I u f1J 290,000 280,000 270,000 ' 260,000 250,000 240,000 230,000 , 220,000 I 210,000

Oct 1 Nov 1 Dec 1 Jan 1 Feb 1 Mar 1 Aprl May 1 Jun 1 Jul 1 Aug 1 Sep 1 South Fork at Anderson Ranch Dam PNRO - Bo ise I I I 4,200 I I I l hr- I -- 4,000 I 3,800 3,600 \ 3,400 3,200 CalculatedCalculated InflowInflow 3,000 2,800 2,600

~ - I 2,000 I- 1,800 I I 1,600 1,400 I I 1,200 1,000 ~ 800 / 600 ~ r - I 400 ~ I J - , - I I I I 3/2/2019' 3/9/2019 3/16/2019 3/23/2019 3/30/2019 4/6/2019 AND - Anderson

[fl - 2019 Required [fl - 2019 ctual

400,000 I - I 380,000 360,000 • .. -. 11 I 340,000 320,000 ······ - - - 300,000 - " 280,000 • 260,000

..i 240,000 ■ _g [ QJ 220,000 ■ .µ - - 5200,000 U 180,000 160,000 - ■• - - 140,000 120,000 100,000 • 80,000 • . II 60,000 Represents current targets, SUBJECT TO CHANGE 40,000 11 • 20,000 0 I I ■ ------■ ------1 I t • I . I • 1 I . I ------• 1 I . I I I OctOl NovOl DecOl lanOl Arrowrock Operations

• Currently discharging 2,900 cfs

• Increases likely as Lucky Peak increases occur

• Operated as needed to slow the fill at Lucky Peak or to keep Lucky Peak from drafting. and Reservoir Elevation:3216.000

~ 2019 ~ 2018 ~ 2017 ~- avg

240,000

200,000

180,000-'-, ------'------1-'--...... &'""------'------'='._,,...._____ "'"4- __'I; __------'---- ~ I QJ ~ 160,000 ~ M140,000 t---,~ ----+---~,T-- ~ "r--'------+----+--l- ~ r-t-__,__--=-=l----+-----+--~ ----\-,____~ ----

120,000

I 60,000 .;...1 __..c:'------i------1------.--''\c-'""-- I---

Oct 1 Nov 1 Dec 1 Jan 1 Feb 1 Mar 1 Aprl May 1 Jun 1 Jul 1 ug 1 Payette Reservoir System

W'· lann Cr e 377110 0 Cascade Full 441510 '646460 168 Full

Q I 34-9 cfs PRLI 2104 cfs

Payette River system (Cascade, Deadwood) is at 67 % of capacity.

Total space available: 264339 AF

Total storage capacity: 800452 AF

Natural Flow: 16514 CFS Payette System @ Horseshoe Bend Apr-Jul Water Supply Forecast WY1983 to WY2019

3,000,000 1981-2010 Average Actual Apr-Jul Runoff = 1,485,000 ac-ft 2,500,000 WY2019 Apr-Jul Adopted Forecast 1,736,000 ac-ft 2,000,000 117% of 1981-2010 average ft)

1,500,000 - Volume (ac- Volume 1,000,000

500,000

0 I 1997 2017 1996 1983 2006 1984 2011 1999 1995 1993 2012 1986 1998 2019 2008 2003 2009 2010 2018 2016 2014 1989 2002 1985 2000 2004 2005 1990 2013 2007 1988 1991 1994 2015 1992 1987 2001 Water Year -Apr-Jul Forecast - Average Actual Apr-Jul Runoff Payette River near Horseshoe Bend, ID

PNRO - Bo ise

16,000 I 15,500 r i 15,000 14,500 Flood Stage 12,000 cfs 14,000 13,500 13,000 -----+------+-~ -----+------+----~ ---+-- 12,500 12,000 11,500 11,000 10,500 J!! 10,000 u 9,500 9,000 8 ,500 8,000 ------i 7,500 7,000 6,500 6,000 5,500 5,000 4,500 4,000 3,500 Black canyon Dam and Reservoir near Emmett, ID

4/ 3/2019 PNRO - Bo ise 21,000 ... .. 20,000

19,000 Flood Stage 16,000 cfs

18,000

17,000

16,000 --~

15,000

14,000

J!! 13,000 ... + ~·-- I- ... u 12,000 11,000 ...... 10,000

9,000

8,000

7,000

6,000

5,000-- -;

4,000 =='------'------'------''--- 4/ 3/2019 4/ 4/2019 4/ 6/ 2019 4/s 12019 4/ 9tio19 4/ 1012019 4/ 11h o19 Cascade Dam and Lake Cascade at Cascade, Idaho Elevation:4828.000

~ 2019 ~ 2018 ~• 2017 [t- avg

640,000 620,000 600,000 ' I 580,000 560,000 540,000 520,000 -1-J ~ 500,000 ~ OJ 480,000 L ~ 460,000 440,000 420,000 400,000 380,000 360,000 340,000

Oct 1 Nov 1 Dec 1 Jan 1 North Fork Payette River a Cascade, Idaho PNRO • Boise

7,000 ~------'------+------+------+-- - --

6,500 6,000 ______.______

5,500 Calculated Inflow 5,000 ----.------+------+------+------+-j- - -ll

4,500

4,000 -----,------+------+------+------+------+_..---- J!! u 3,500

3,000------_.______.______....______.______

2,500

2,000 ------...... ------,------..------,------•-----

1,500

I I 3/9/2019 3/23/2019 3/30/2019 4/6/2019 CSC - Cascade

~ 2019 Guide Curve~ - 2019 Actual

0.00 ,

640,000 ~~~~,~ ______j______L ___ _j_ ___ _j______J_ = :___ _:_____,_ ____L ___L ~t=== 620,000 • 600,000 -----1------,-----t-----t---=:c==:::t' I 580,000 ~ ------,.------_J 560,000-----1-----~------+------+------t-----~----. I B, I 540,000 I 520,000------¼------+------+------+------.---Fr,ir!,------i-----f------i---IIll ~-.. 500,000 480,000 -----+------+-----+-----Ii.:"~ ...... - 460,000 c 440,000------+------+------+------+------i--\-1. ----'',------1------i---• 2 420,000 11a.i § 400,000 ----+------l-----~-----k=--,.-~~~~----~----~ ----L~ •- . u 380,000 360,000 ~~~~~~::::~~t::::::=:::::::r= __ l ____1~i_ J~,.,__ __ l_L_J__ 340,000 320,000 -----+-----..,______-+-----+------+-- ~;..:..----"<---!---f-----!---- 300,000 280,000------+------+-----~------...,.___--+------260,000 ·1111 . Represents current targets, 220,000 200,000------+------+------~-----~------+--SUBJECT TO CHANGE 180,000

I I OctOl NovOl DecOl lanOl FebOl MarOl AprOl Cascade Operations • Flows were at 600 cfs – Evening of April 8, flows reduced to minimum flows of 200 cfs as Emmett flows began to rise (Target flood flows: 16,000)

• Increased flows to 1,200 cfs yesterday, April 10th

• Increased flows today to 2,200 cfs, anticipate increase to 3,000 tomorrow to hold space in reservoir

• System inflows will determine the rate and timing of releases North Fork Payette River at Cascade, Idaho

PNRO - Boise I I 1,750 I I I I I I 1,700 1,650 V 1,600 1,550 1,500 1,450 1,400 1,350 1,300 1,250 1,200 1,150 M 1,100 1,050 1,000 J!! u 950 I I 900 I I ~ I I 850 800 750 700 ~ 650 1~1/li'~ ;'I. h . .t.;~~ 600 ~ • •· ·• . I I I I 550 I I ' 500 450 i\ 400 350 300 250 I ' I • •• A A l I I VI~,~,.~ vv,,T"- I 200 I I I v11v•.. : C'V • -~ I I I I I I I I I I 4/ 6/ 2019 4/ 6/2019 4/7/2019 4/7/2019 4/ 8/2019 4/ 8/2019 4/ 9/2019 4/ 9/2019 4/ 10/2019 4/ 10/ 2019 4/ 11/2019 Deadwood Dam, Idaho Bevation:5334.000

~ 20 19 ~ 2018 ~• 20 17~ - avg

155,000 150,000 ' 145,000 140,000 135,000 130,000 ' 125,000 .LJ I' I QJ I Q.l 120,000 , I II:, I I I I QJ 115,000 uL ' 10 110,000

105,000 1 I I I I I 100,000 : I 95,000 ' ' 90,000 ' 85,000 : 80,000 : I I I ,~ ~ Oct 1 Nov 1 Dec 1 Jan 1 Feb 1 Mar 1 Apr 1 Mayl Jun 1 Jul 1 Aug 1 Sep 1 Deadwood Rive below Deadwood Dam PNRO • Bo ise

700

650

600

550 Calculated Inflow

500

450

J!! 400 u 350

300

250

200

150

100

3/2/2019 DED - Deadwood

~ - 2019 Guide Curve ~ - 2019 Actual

0,00 155,000 150,000 145,000 0.50 : 140,000 135,000 130,000 125,000 120,000 i J 115,000 110,000 * 105,000 ,I.I ~ 100,000 .µ 95,000 [ I 0 I 90,000 _J_ ___ _ u I' _ 85,000 I 80,000 75,000 70,000 65,000 60,000

50,000 Represents current targets, SUBJECT TO CHANGE Deadwood Operations

• Currently discharging 50 cfs

• Anticipate increasing outflows next week possibly depending on inflows at that time

• Targeting full in late June Owyhee/Malheur Reservoir System

04/ 10/2019 l·IPOO 6 0 cfs

31 cfs

□ ~Philli -' P DO 21 c s 1 f41730 0 1 5 cfs 30 Full PH 7 cs

Snake River ,, Ell 5 8 cfs - 1 0 3_ cfs Bully Cre 22696 23676 I L 6 , Full g---- cfs

cfs 75 cf Owyhee Apr-Jul Water Supply Forecast WY1983 to WY2019

1,200,000

WY2019 Apr-Jul Adopted 1,000,000 Forecast 474,000 ac-ft 134% of 1981-2010 average 800,000 1981-2010 Average Actual Apr-Jul Runoff = 353,000 ac-ft ft)

600,000 Volume (ac- Volume 400,000

200,000

0 II I I I I I I I I I I I I I I 2011 2006 1983 1998 2005 2019 2017 1995 1993 1986 1985 1996 1997 1999 1989 2008 2010 2002 2009 2016 1991 2004 2000 2001 2003 1990 2018 2012 1987 2007 2015 1988 2013 1994 2014 1992 Water Year

Apr-Jul Forecast Average Actual Apr-Jul Runoff Owyhee Operations

• Currently discharging 105 cfs below the dam

• Currently discharging 75 cfs out the canal, will increase on Monday

• Discharge will increase as irrigation demand turns on

• Complete reservoir refill unlikely unless we get a very wet spring Lake Owyhee and Owyhee River near Nyssa, OR Elevation:2344.000

~• 2019 ~• 2018 • 2017 ~- avg

700,000

650,000

600,000

550,000

~ 500,000 QJ

~I 450,QQQ QJ ul !U 400,000

350,000

300,000 I

250,000 I 200,000

I I

Oct 1 Nov 1 Dec 1 Feb 1 Marl Apr 1 May 1 Jun 1 Jul 1 Aug 1 ake Owyhee and Owyhee River near Nyssa, OR

PNRO • Bo ise

5,800 ------n------5,600 S,400-~------+------~------~------~------~----- 5,200 5,000 -,------;------r------,------+------.------4,800 4,500 -i------'------4,400 4,200-~------+------+------+------+------...------4,000 Calculated Inflow 3,800 ------...... -• ----- 3,600 J!! 3,400 ------~------~--.------­ u 3,200 3,000 ___;i-\------+------+------+I ------+------'~ - ---+------

1,800 -.----'l>------+------+------~----- 1,600 1,400 -i---~------1------1,200 1,000 ----c!------""l!l... ---t--- ~ ------!-----l'-----+------+------+------800

I I 3/2/2019 3/9/2019 3/16/2019 3/23/2019 3/30/2019 4/6/2019