Precipitation
Reservoir
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 745,000 acre-feet (86 percent of normal). Yield from the Snake
River above Palisades Reservoir is estimated to be 2,325,000 acre-feet (87
percent of normal). The 50 percent chance yield near Heise is expected to
be 3,450,000 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
319,000 acre-feet (80 percent of normal).
================================================================================================================================== SNAKE RIVER BASIN Streamflow Forecasts - April 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 604 701 | 745 86 | 789 886 869 | | SNAKE above Palisades (2) APR-SEP 2054 2215 | 2325 87 | 2435 2596 2671 | | SNAKE near Heise (2) APR-SEP 2980 3260 | 3450 85 | 3640 3920 4049 | | PACIFIC CREEK at Moran APR-SEP 106 124 | 136 82 | 148 166 166 | | GREYS above Palisades APR-SEP 256 288 | 310 80 | 332 364 388 | | SALT near Etna APR-SEP 241 288 | 319 80 | 350 397 399 | | ================================================================================================================================== SNAKE RIVER BASIN | SNAKE RIVER BASIN Reservoir Storage (1000 AF) - End of March | Watershed Snowpack Analysis - April 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 12.7 13.2 11.2 | SNAKE above Jackson Lake 9 73 87 | JACKSON LAKE 847.0 657.4 596.7 473.2 | PACIFIC CREEK 3 73 95 | PALISADES 1400.0 1188.8 713.7 1014.0 | GROS VENTRE RIVER 4 76 80 | | HOBACK RIVER 6 79 83 | | GREYS RIVER 5 86 89 | | SALT RIVER 5 90 95 | | SNAKE above Palisades 30 78 88 | ================================================================================================================================== * 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.