Streamflow
The most probable, 50 percent chance, June through September runoff yield
forecast is below average for the basin. The Snake near Moran is expected
to yield 418,000 acre-feet (72 percent of normal). Yield from the Snake
River above Palisades Reservoir is estimated to be 1,565,000 acre-feet (86
percent of normal). The 50 percent chance yield near Heise is expected to
be 2,140,000 acre-feet (82 percent of normal). Pacific Creek at Moran is
expected to yield about 85,000 acre-feet (82 percent of average). Greys
River above Palisades Reservoir is estimated to yield 149,000 acre-feet (62
percent of normal). Salt River near Etna is estimated to have a yield of
121,000 acre-feet (53 percent of normal).
================================================================================================================================== SNAKE RIVER BASIN Streamflow Forecasts - June 1, 2000 ================================================================================================================================== | <<====== 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 262 369 | 418 72 | 467 574 579 | | SNAKE above Palisades (2) JUN-SEP 1326 1468 | 1565 86 | 1662 1804 1823 | | SNAKE near Heise (2) JUN-SEP 1763 1988 | 2140 82 | 2292 2517 2622 | | PACIFIC CREEK at Moran JUN-SEP 61 75 | 85 82 | 95 109 104 | | GREYS above Palisades JUN-SEP 111 134 | 149 62 | 164 187 241 | | SALT near Etna JUN-SEP 75 102 | 121 53 | 140 167 228 | | ================================================================================================================================== SNAKE RIVER BASIN | SNAKE RIVER BASIN Reservoir Storage (1000 AF) - End of May | Watershed Snowpack Analysis - June 1, 2000 ================================================================================================================================== 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 14.3 13.6 13.6 | SNAKE above Jackson Lake 5 15 25 | JACKSON LAKE 847.0 843.9 646.0 540.5 | PACIFIC CREEK 2 39 60 | PALISADES 1400.0 1323.8 723.3 1055.0 | GROS VENTRE RIVER 2 25 45 | | HOBACK RIVER 5 11 20 | | GREYS RIVER 4 8 10 | | SALT RIVER 3 0 0 | | SNAKE above Palisades 17 13 20 | ================================================================================================================================== * 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.