Precipitation
Reservoir
Streamflow
The most probable April through September runoff yield forecast is near
average for the basin. The Snake near Moran is expected to yield 890,000
acre feet (102 percent of normal). Yield from the Snake River above
Palisades Reservoir is estimated to be 2,858,000 acre feet (107 percent of
normal). The 50 percent chance yield near Heise is expected to be 4,100,000
acre feet (101 percent of normal). Pacific Creek at Moran is expected to
yield about 173,000 acre feet (104 percent of average). Greys River above
Palisades Reservoir is estimated to yield 375,000 acre feet (97 percent of
normal). Salt River near Etna is estimated to have a yield of 380,000 acre
feet (95 percent of normal).
================================================================================================================================== SNAKE RIVER BASIN Streamflow Forecasts - June 1, 1998 ================================================================================================================================== | <<====== Drier ====== Future Conditions ======= Wetter =====>> | | | Forecast Point Forecast | ==================== Chance Of Exceeding * ====================== | Period | 90% 70% | 50% (Most Probable) | 30% 10% | 30-Yr Avg. | (1000AF) (1000AF) | (1000AF) (% AVG.) | (1000AF) (1000AF) | (1000AF) ====================================================================|=======================|===================================== SNAKE near Moran (1,2) JUN-SEP 379 486 | 535 92 | 584 691 579 | | SNAKE above Palisades (2) JUN-SEP 1655 1797 | 1894 104 | 1991 2133 1823 | | SNAKE near Heise (2) JUN-SEP 2303 2528 | 2680 102 | 2832 3057 2622 | | PACIFIC CREEK at Moran JUN-SEP 72 86 | 96 92 | 106 120 104 | | GREYS above Palisades JUN-SEP 169 192 | 207 86 | 222 245 241 | | SALT near Etna JUN-SEP 173 200 | 219 96 | 238 265 228 | | ================================================================================================================================== SNAKE RIVER BASIN | SNAKE RIVER BASIN Reservoir Storage (1000 AF) - End of May | Watershed Snowpack Analysis - June 1, 1998 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= GRASSY LAKE 15.2 14.9 15.1 13.6 | SNAKE above Jackson Lake 4 58 90 | JACKSON LAKE 847.0 757.7 717.9 540.5 | PACIFIC CREEK 2 60 106 | PALISADES 1400.0 1121.1 921.6 1055.2 | GROS VENTRE RIVER 2 69 86 | | HOBACK RIVER 5 33 58 | | GREYS RIVER 2 38 60 | | SALT RIVER 3 26 35 | | SNAKE above Palisades 15 52 76 | ================================================================================================================================== * 90%, 70%, 30%, and 10% chances of exceeding are the probabilities that the actual volume will exceed the volumes in the table. The average is computed for the 1961-1990 base period. (1) - The values listed under the 10% and 90% Chance of Exceeding are actually 5% and 95% exceedance levels. (2) - The value is natural volume - actual volume may be affected by upstream water management. ==================================================================================================================================