Precipitation
Reservoirs
Streamflow
Water supply is estimated to be above normal this year. The following
values reflect the 50 percent chance yields for the April through September
runoff period. In the upper portion of the drainage, Wind River near Dubois
is expected to yield about 125,000 acre feet (about 119 percent of average).
The Wind River above Bull Lake Creek is expected to yield 640,000 acre feet
(119 percent of average). Wind River at Riverton will yield about 765,000
acre feet (118 percent of average). Boysen Reservoir inflow will yield about
970,000 acre feet (120 percent of normal). Bull Lake Creek near Lenore is
expected to yield about 200,000 acre feet (109 percent of average). Little
Popo Agie River near Lander is expected to yield about 60,000 acre feet (115
percent of average). South Fork of Little Wind near Fort Washakie will
yield about 105,000 acre feet (130 percent of average). Little Wind River
near Riverton will yield about 385,000 acre feet (119 percent of average).
================================================================================================================================== WIND RIVER BASIN Streamflow Forecasts - March 1, 1999 ================================================================================================================================== | <<====== 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 (D) APR-SEP 102 116 | 125 123 | 134 148 102 | | WIND RIVER abv Bull Lake Cr (2) APR-SEP 534 597 | 640 119 | 683 746 538 | | WIND RIVER at Riverton (2) APR-SEP 546 676 | 765 118 | 854 984 648 | | BOYSEN Reservoir Inflow (2) APR-SEP 648 840 | 970 120 | 1100 1292 809 | | BULL LAKE CR near Lenore (2) APR-SEP 160 184 | 200 109 | 216 240 183 | | LT POPO AGIE RIVER nr Lander APR-SEP 41 52 | 60 115 | 68 79 52 | | SF LT WIND nr Fort Washakie APR-SEP 77 94 | 105 130 | 116 133 81 | | LT WIND RIVER nr Riverton APR-SEP 233 324 | 385 119 | 446 537 324 | | ================================================================================================================================== WIND RIVER BASIN | WIND RIVER BASIN Reservoir Storage (1000 AF) - End of February | Watershed Snowpack Analysis - March 1, 1999 ================================================================================================================================== 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 97.8 95.2 85.0 | WIND RIVER above Dubios 7 126 123 | BOYSEN 596.0 550.0 531.2 555.2 | LITTLE WIND 2 119 119 | PILOT BUTTE 31.6 22.0 21.7 17.7 | POPO AGIE 6 106 100 | | WIND above Boysen Resv 14 116 112 | ================================================================================================================================== * 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. (D) - The operational measurement of flow at this point has been discountinued.