Precipitation
Reservoirs
Streamflow
Water supply is estimated to be above normal this year. The following
values reflect the 50 percent chance yields for the June through September
runoff period. In the upper portion of the drainage, Wind River near Dubois
is expected to yield about 92,000 acre feet (about 124 percent of average).
The Wind River above Bull Lake Creek is expected to yield 530,000 acre feet
(126 percent of average). Wind River at Riverton will yield about 680,000
acre feet (135 percent of average). Boysen Reservoir inflow will yield about
825,000 acre feet (143 percent of normal). Bull Lake Creek near Lenore is
expected to yield about 195,000 acre feet (127 percent of average). Little
Popo Agie River near Lander is expected to yield about 45,000 acre feet (122
percent of average). South Fork of Little Wind near Fort Washakie will
yield about 82,000 acre feet (130 percent of average). Little Wind River
near Riverton will yield about 295,000 acre feet (122 percent of average).
================================================================================================================================== WIND RIVER BASIN Streamflow Forecasts - June 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) JUN-SEP 84 89 | 92 124 | 95 100 74 | | WIND RIVER abv Bull Lake Cr (2) JUN-SEP 494 515 | 530 126 | 545 566 420 | | WIND RIVER at Riverton (2) JUN-SEP 560 631 | 680 135 | 729 800 505 | | BOYSEN Reservoir Inflow (2) JUN-SEP 618 741 | 825 136 | 909 1032 609 | | BULL LAKE CR near Lenore (2) JUN-SEP 180 189 | 195 127 | 201 210 154 | | LT POPO AGIE RIVER nr Lander JUN-SEP 40 43 | 45 122 | 47 50 37 | | SF LT WIND nr Fort Washakie JUN-SEP 75 79 | 82 130 | 85 89 63 | | LT WIND RIVER nr Riverton JUN-SEP 257 280 | 295 122 | 310 333 241 | | ================================================================================================================================== WIND RIVER BASIN | WIND RIVER BASIN Reservoir Storage (1000 AF) - End of May | Watershed Snowpack Analysis - June 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 94.4 116.2 92.7 | WIND RIVER above Dubios 3 194 160 | BOYSEN 596.0 490.4 447.6 546.4 | LITTLE WIND 2 228 231 | PILOT BUTTE 31.6 16.6 18.1 25.5 | POPO AGIE 3 414 194 | | WIND above Boysen Resv 7 291 193 | ================================================================================================================================== * 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.