Streamflow.
The most probable, 50 percent chance, April through September runoff yield
forecast is below average for the basin. The Snake near Moran is expected
to yield 735,000 acre-feet (85 percent of normal). Yield from the Snake
River above Palisades Reservoir is estimated to be 2,387,000 acre-feet (89
percent of normal). The 50 percent chance yield near Heise is expected to
be 3,440,000 acre-feet (85 percent of normal). Pacific Creek at Moran is
expected to yield about 136,000 acre-feet (82 percent of average). Greys
River above Palisades Reservoir is estimated to yield 310,000 acre-feet (80
percent of normal). Salt River near Etna is estimated to have a yield of
320,000 acre-feet (80 percent of normal).
================================================================================================================================== SNAKE RIVER BASIN Streamflow Forecasts - March 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) APR-SEP 556 679 | 735 85 | 791 914 869 | | SNAKE above Palisades (2) APR-SEP 2026 2241 | 2387 89 | 2533 2748 2671 | | SNAKE near Heise (2) APR-SEP 2824 3191 | 3440 85 | 3689 4056 4049 | | PACIFIC CREEK at Moran APR-SEP 101 122 | 136 82 | 150 171 166 | | GREYS above Palisades APR-SEP 236 280 | 310 80 | 340 384 388 | | SALT near Etna APR-SEP 213 277 | 320 80 | 363 427 399 | | ================================================================================================================================== SNAKE RIVER BASIN | SNAKE RIVER BASIN Reservoir Storage (1000 AF) - End of February | Watershed Snowpack Analysis - March 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 12.5 13.1 11.0 | SNAKE above Jackson Lake 9 67 87 | JACKSON LAKE 847.0 653.5 623.4 481.0 | PACIFIC CREEK 3 68 96 | PALISADES 1400.0 1247.1 1039.3 1063.1 | GROS VENTRE RIVER 3 68 79 | | HOBACK RIVER 6 77 87 | | GREYS RIVER 5 83 93 | | SALT RIVER 5 85 98 | | SNAKE above Palisades 29 72 89 | ================================================================================================================================== * 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.