Precipitation.
Reservoir.
Streamflow.
Streamflow is forecast to be near to slightly below average for the basin. The
50 percent chance yield near Heise is expected to be 3,680,000 acre feet (91
percent of normal). Yield from the Snake River above Palisades Reservoir is
estimated to be 2,542,000 acre feet (95 percent of normal). The Snake at Moran
is expected to yield 785,000 acre feet (90 percent of normal). Pacific Creek
at Moran will probably yield 170,000 acre feet (102 percent of average). Greys
River above Palisades Reservoir is estimated to yield 345,000 acre feet (89
percent of normal). Salt River near Etna is estimated to have a yield of
383,000 acre feet (96 percent of normal).
================================================================================================================================== SNAKE RIVER BASIN Streamflow Forecasts - March 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) APR-SEP 606 729 | 785 90 | 841 964 869 | | SNAKE above Palisades (2) APR-SEP 2181 2396 | 2542 95 | 2688 2903 2671 | | SNAKE near Heise (2) APR-SEP 3064 3431 | 3680 91 | 3929 4296 4049 | | PACIFIC CREEK at Moran APR-SEP 135 156 | 170 102 | 184 205 166 | | GREYS above Palisades APR-SEP 271 315 | 345 89 | 375 419 388 | | SALT near Etna APR-SEP 276 340 | 383 96 | 426 490 399 | | ================================================================================================================================== SNAKE RIVER BASIN | SNAKE RIVER BASIN Reservoir Storage (1000 AF) - End of February | Watershed Snowpack Analysis - March 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 7.8 13.2 11.0 | SNAKE above Jackson Lake 9 57 92 | JACKSON LAKE 847.0 649.6 652.3 481.0 | PACIFIC CREEK 3 59 100 | PALISADES 1400.0 1204.5 854.7 1063.1 | GROS VENTRE RIVER 4 67 98 | | HOBACK RIVER 6 55 82 | | GREYS RIVER 3 61 92 | | SALT RIVER 5 69 98 | | SNAKE above Palisades 29 60 93 | ================================================================================================================================== * 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.