Precipitation
Reservoirs
Streamflow
Water supply is estimated to be below normal this year. The following values
reflect the 50 percent chance yields. In the upper portion of the drainage,
Wind River near Dubois is expected to yield about 96,000 acre feet (about 6
percent below normal) during the April to September period. Other forecast
points on the Wind River drainage include Wind River above Bull Lake 515,000
acre feet (4% below normal), Wind River at Riverton 615,000 acre feet (5% below
average), and below Boysen 760,000 acre feet (6 % below normal). Bull Lake
Creek near Lenore is expected to yield about 175,000 acre feet (4% below
normal), Little Popo Agie River near Lander about 50,000 acre feet (4% below
normal), South Fork of Little Wind near Fort Washakie about 72,000 acre feet
(11% below normal), and Little Wind River near Riverton about 275,000 acre feet
(15 percent less than normal).
================================================================================================================================== WIND 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) ====================================================================|=======================|===================================== WIND RIVER near Dubois APR-SEP 72 86 | 96 94 | 106 120 102 | | WIND RIVER abv Bull Lake Cr (2) APR-SEP 404 470 | 515 96 | 560 626 538 | | WIND RIVER at Riverton (2) APR-SEP 445 546 | 615 95 | 684 785 648 | | WIND RIVER below Boysen (2) APR-SEP 438 630 | 760 94 | 890 1082 809 | | BULL LAKE CREEK near Lenore (2) APR-SEP 135 159 | 175 96 | 191 215 183 | | LITTLE POPO AGIE RIVER near Lander APR-SEP 32 43 | 50 96 | 57 68 52 | | SF LITTLE WIND RIVER nr Fort Washaki APR-SEP 55 65 | 72 89 | 79 89 81 | | LITTLE WIND RIVER near Riverton APR-SEP 138 220 | 275 85 | 330 412 324 | | ================================================================================================================================== WIND RIVER BASIN | WIND 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 ========================================================================|========================================================= BULL LAKE 151.8 95.2 81.1 85.0 | WIND RIVER above Dubios 7 63 100 | BOYSEN 596.0 531.2 524.0 555.2 | LITTLE WIND 2 79 100 | PILOT BUTTE 31.6 21.7 23.5 17.7 | POPO AGIE 6 70 95 | | WIND above Boysen Resv 14 67 99 | ================================================================================================================================== * 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.