Precipitation
Reservoir
Streamflow
The most probable, 50 percent chance, May through September runoff yield forecast is below average for the basin. The Snake near Moran is expected to yield 642,000 acre-feet (79 percent of normal). Yield from the Snake River above Palisades Reservoir is estimated to be 1,930,000 acre-feet (78 percent of normal). The 50 percent chance yield near Heise is expected to be 2,840,000 acre-feet (77 percent of normal). Pacific Creek at Moran is expected to yield about 117,000 acre-feet (75 percent of average). Greys River above Palisades Reservoir is estimated to yield 231,000 acre-feet (66 percent of normal). Salt River near Etna is estimated to have a yield of 217,000 acre-feet (64 percent of normal).
================================================================================================================================== SNAKE RIVER BASIN Streamflow Forecasts - May 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) MAY-SEP 515 602 | 642 79 | 682 769 814 | | SNAKE above Palisades (2) MAY-SEP 1694 1835 | 1930 78 | 2025 2166 2475 | | SNAKE near Heise (2) MAY-SEP 2451 2682 | 2840 77 | 2998 3229 3672 | | PACIFIC CREEK at Moran MAY-SEP 89 106 | 117 75 | 128 145 157 | | GREYS above Palisades MAY-SEP 191 215 | 231 66 | 247 271 350 | | SALT near Etna MAY-SEP 154 192 | 217 64 | 242 280 339 | | ================================================================================================================================== SNAKE RIVER BASIN | SNAKE RIVER BASIN Reservoir Storage (1000 AF) - End of April | Watershed Snowpack Analysis - May 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 13.0 13.4 11.7 | SNAKE above Jackson Lake 6 45 54 | JACKSON LAKE 847.0 716.6 533.1 456.5 | PACIFIC CREEK 2 45 64 | PALISADES 1400.0 1161.1 555.4 950.0 | GROS VENTRE RIVER 4 54 59 | | HOBACK RIVER 6 48 63 | | GREYS RIVER 5 57 67 | | SALT RIVER 5 50 55 | | SNAKE above Palisades 25 48 57 | ================================================================================================================================== * 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.