1. Idaho Water Supply Committe Meeting April 12, 2012 By Art Hill Civil Engineer

3. Major Storage Reservoirs in the Upper Snake River Basin Upper Snake River system (Jackson Lake, Palisades, Grassy Lake, Island Park, Ririe, American Falls, Lake Walcott) is at 69% of capacity (2,798,951 AF). Total space available: 1,246,744 AF with a Total storage capacity: 4,045,695 AF.

4. Major Storage Reservoirs in the Upper Snake River Basin Upper Snake River system (Jackson Lake, Palisades, Grassy Lake, Island Park, Ririe, American Falls, Lake Walcott) is at 83% of capacity (3,385,057 AF). Total space available is 660,638 AF with a total storage capacity of 4,045,695 AF.

13. Water Year 1985 April-July Heise Runoff was 2,992.0 Kaf Water Year 2000 April-July Heise Runoff was 2,646.0 Kaf Water Year 1985 April-July Jackson Runoff was 708.6 Kaf Water Year 2000 April-July Jackson Runoff was 664.1 Kaf CURRENT MONTHLY FORECAST SUMMARY APRIL 1, 2012 +---------------------------------------------------------------------------------------------------------+ | | | | NORMAL | 120% NORMAL | 80% NORMAL | | | | | SUBSEQUENT | SUBSEQUENT | SUBSEQUENT | | | | | CONDITIONS | CONDITIONS | CONDITIONS | | | |1971-2000 | | | | | |FORECAST | AVERAGE |FORECAST PERCENT |FORECAST PERCENT |FORECAST PERCENT | | FORECAST |PERIOD | (1000AF) |(1000AF) NORMAL |(1000AF) NORMAL |(1000AF) NORMAL | |---------------------------------------------------------------------------------------------------------| | | AVE NORM % HIGH % LOW % | | | HEISE APR-JUL 3561.0 3250.0*** 97 | | ISLAND PARK APR-JUL 234.6 214.3 91 260.7 111 167.9 72 | | JACKSON LAKE APR-JUL 814.7 775.6 95 822.6 101 728.6 89 | | LITTLE WOOD APR-JUL 86.9 80.0*** 92 | | RIRIE_NEW APR-JUN 81.5 53.0*** 65 | | TETON APR-JUL 410.7 359.4 88 384.4 94 334.5 81 | | |_________________________________________________________________________________________________________| *** Coordinated with Corps of Engineers

33. Annual Windshield Snow Survey and Jackson Lake Operations Meeting will be held May 17 & 18, 2012 in Jackson, WY Any Questions?