Precipitation.
Reservoir.
Streamflow.
Streamflow is forecast to be much above average for the basin. The 50 percent
chance yields for the April to September period are forecast to be 46 to 76
percent above normal in the Snake River basin. The 50 percent chance yield
from the Snake River above Palisades Reservoir is estimated to be 4,210,000
acre feet; this is 59 percent more than normal. The Snake at Moran is expected
to yield 1,290,000 acre feet (48 percent above normal). Pacific Creek at
Moran will probably yield 302,000 acre feet (76 percent more than average).
Greys River near Palisades Reservoir is estimated to yield 565,000 acre feet
(46 percent more than normal). Salt River near Etna is estimated to have a
yield of 600,000 acre feet (50 percent above normal).
================================================================================================================================== SNAKE RIVER BASIN Streamflow Forecasts - February 1, 1997 ================================================================================================================================== | <<====== 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 nr Moran (1,2) APR-SEP 1091 1228 | 1290 148 | 1352 1489 869 | | SNAKE R abv Palisades Rsvr nr Alpine APR-SEP 3712 4009 | 4210 159 | 4411 4708 2647 | | SNAKE nr Heise (2) APR-SEP 5399 5846 | 6150 152 | 6454 6901 4048 | | PACIFIC CREEK at Moran APR-SEP 262 286 | 302 176 | 318 342 172 | | GREYS R abv Palisades Reservoir APR-SEP 469 526 | 565 146 | 604 661 388 | | SALT abv Reservoir nr Etna APR-SEP 492 556 | 600 150 | 644 708 400 | | ================================================================================================================================== SNAKE RIVER BASIN | SNAKE RIVER BASIN Reservoir Storage (1000 AF) - End of January | Watershed Snowpack Analysis - February 1, 1997 ================================================================================================================================== 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 13.1 13.1 10.8 | SNAKE above Jackson Lake 10 138 182 | JACKSON LAKE 847.0 691.6 677.0 479.6 | PACIFIC CREEK 3 133 188 | PALISADES 1400.0 1188.7 1365.6 1043.6 | GROS VENTRE RIVER 4 133 170 | | HOBACK RIVER 6 128 174 | | GREYS RIVER 3 136 172 | | SALT RIVER 5 122 167 | | SNAKE above Palisades 30 134 178 | ================================================================================================================================== * 90%, 70%, 30%, and 10% chances of exceeding are the probabilities that the actual flow 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 flow - actual flow may be affected by upstream water management.