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The 2009 Water Year• Normal snowpack.Normal snowpack.
• Late season snow.Late season snow.
• Rain in June and August.Rain in June and August.
AVERAGE DAILY DISCHARGE - SNAKE RIVER AT LOWER GRANITE DAM
0
50,000
100,000
150,000
200,000
250,000
Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep
FLOW (CFS)
2006 WATER YEAR
2007 WATER YEAR
2008 WATER YEAR
2009 WATER YEAR
MEAN (1975 - 2008)
2009 April-July Runoff• Snake R. nr Heise* 3978 kaf 120 % of avg 73 rd / 99 years
• Big Wood at Hailey 236 107% 60 / 94
• Boise R. nr Boise* 1226 87 % 45 / 114
• Payette at HSB* 1491 93 % 38/ 90
• Weiser nr Weiser 287 70 % 18 / 67
• Snake at Weiser 5004 90 % 47 / 99
• Salmon at Whitebird 6545 115 % 63 / 97
• St. Joe at Calder 1087 94 % 37 / 91
• Bear at Stewart Dam 165 113 % 30 / 50
* calculated natural flow
August Storm on the Boise
• Natural flow increased but operational loss also increased.
• Stewart Decree went from 60% to 75% delivery.
BOISE RIVER RESERVOIR SYSTEM
0
200
400
600
800
1000
1200
1960 1963 1966 1969 1972 1975 1978 1981 1984 1987 1990 1993 1996 1999 2002 2005 2008
1000 ACFT
END OF SEPTEMBER STORAGE
CAPACITY
AVG
SNAKE RIVER NATURAL FLOW NEAR HEISE
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
1911191519191923192719311935193919431947195119551959196319671971197519791983198719911995199920032007Water Year
Thousands of Acre-Feet
1911-2009
7-Year Moving Average
Red Bars are Moderate El Nino Years
Average
UPPER SNAKE RIVER RESERVOIR SYSTEM
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
1960196219641966196819701972197419761978198019821984198619881990199219941996199820002002200420062008
1000 ACFT
END OF SEPTEMBER STORAGE
Capacity
Average
Jackson+ Palisades+ Island Park + American Falls
BEAR LAKE ADJUSTED STORAGE RELEASE
0
200
400
600
800
1000
1200
1400
1600
6-May13-May20-May27-May3-Jun10-Jun17-Jun24-Jun
1-Jul 8-Jul 15-Jul22-Jul29-Jul5-Aug12-Aug19-Aug26-Aug2-Sep9-Sep16-Sep23-Sep30-Sep
CFS
200420052006200720082009
OUTLET CORRECTED FOR RAINBOW, DINGLE AND DECREE ADJUSTMENT
Last Chance Canal SystemJune Diversions
0
5
10
15
20
25
30
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
1000 Acre-Feet
Last Chance Canal System APR-SEP Diversion
0
20
40
60
80
100
120
1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008
1000 ACFT
Stored Water Diversion in Dark Blue ( 2000-2009) Only
BEAR LAKE END OF MONTH STORAGE
0
500
1000
1500
2000
Oct-21Oct-29Oct-37Oct-45Oct-53Oct-61Oct-69Oct-77Oct-85Oct-93Oct-01Oct-09
1000 ACFT
5923.65 FULL
5920
5915
5911
5904
WATER YEARS 1922-2009
ELEVATION
UPSTREAM STORAGE RESTRICTION
Chinook Salmon spawning in Iron Creek, tributary to Chinook Salmon spawning in Iron Creek, tributary to Salmon River between Challis and Salmon. Site of IWRB’s Salmon River between Challis and Salmon. Site of IWRB’s
first 20-year agreement not to divert (2007).first 20-year agreement not to divert (2007).