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 595,000 acre-feet (69 percent of normal). Yield from the Snake River
above Palisades Reservoir is estimated to be 1,790,000 acre-feet (67 percent
of normal). The 50 percent chance yield near Heise is expected to be
2,610,000 acre-feet (65 percent of normal). Pacific Creek at Moran is
expected to yield about 106,000 acre-feet (64 percent of average). Greys
River above Palisades Reservoir is estimated to yield 255,000 acre-feet (66
percent of normal). Salt River near Etna is estimated to have a yield of
260,000 acre-feet (65 percent of normal).
================================================================================================================================== SNAKE RIVER BASIN Streamflow Forecasts - February 1, 2001 ================================================================================================================================== | <<====== 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 404 535 | 595 69 | 655 786 869 | | SNAKE above Palisades (2) APR-SEP 1355 1614 | 1790 67 | 1966 2225 2671 | | SNAKE near Heise (2) APR-SEP 1859 2306 | 2610 65 | 2914 3361 4049 | | PACIFIC CREEK at Moran APR-SEP 72 92 | 106 64 | 120 140 166 | | GREYS above Palisades APR-SEP 169 220 | 255 66 | 290 341 388 | | SALT near Etna APR-SEP 146 214 | 260 65 | 306 374 399 | | ================================================================================================================================== SNAKE RIVER BASIN | SNAKE RIVER BASIN Reservoir Storage (1000 AF) - End of January | Watershed Snowpack Analysis - February 1, 2001 ================================================================================================================================== 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 12.4 10.8 | SNAKE above Jackson Lake 9 66 51 | JACKSON LAKE 847.0 635.2 645.0 479.6 | PACIFIC CREEK 3 67 56 | PALISADES 1400.0 638.7 1232.2 1044.0 | GROS VENTRE RIVER 3 83 56 | | HOBACK RIVER 6 72 57 | | GREYS RIVER 5 66 58 | | SALT RIVER 5 70 62 | | SNAKE above Palisades 29 69 55 | ================================================================================================================================== * 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.