Precipitation
Reservoirs
Streamflow
Water supply is estimated to be above normal this year. The following
values reflect the 50 percent chance yields for the May through September
runoff period. In the upper portion of the drainage, Wind River near Dubois
is expected to yield about 130,000 acre feet (about 123 percent of average).
The Wind River above Bull Lake Creek is expected to yield 630,000 acre feet
(113 percent of average). Wind River at Riverton will yield about 800,000
acre feet (131 percent of average). Boysen Reservoir inflow will yield about
1,085,000 acre feet (143 percent of normal). Bull Lake Creek near Lenore is
expected to yield about 220,000 acre feet (123 percent of average). Little
Popo Agie River near Lander is expected to yield about 67,000 acre feet (137
percent of average). South Fork of Little Wind near Fort Washakie will
yield about 127,000 acre feet (163 percent of average). Little Wind River
near Riverton will yield about 450,000 acre feet (149 percent of average).
================================================================================================================================== WIND RIVER BASIN Streamflow Forecasts - May 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) MAY-SEP 118 125 | 130 137 | 135 142 95 | | WIND RIVER abv Bull Lake Cr (2) MAY-SEP 554 599 | 630 123 | 661 706 511 | | WIND RIVER at Riverton (2) MAY-SEP 622 728 | 800 131 | 872 978 609 | | BOYSEN Reservoir Inflow (2) MAY-SEP 826 980 | 1085 143 | 1190 1344 758 | | BULL LAKE CR near Lenore (2) MAY-SEP 191 208 | 220 123 | 232 249 179 | | LT POPO AGIE RIVER nr Lander MAY-SEP 53 61 | 67 137 | 73 81 49 | | SF LT WIND nr Fort Washakie MAY-SEP 107 119 | 127 163 | 135 147 78 | | LT WIND RIVER nr Riverton MAY-SEP 332 402 | 450 149 | 498 568 303 | | ================================================================================================================================== WIND RIVER BASIN | WIND RIVER BASIN Reservoir Storage (1000 AF) - End of April | Watershed Snowpack Analysis - May 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 99.9 95.7 79.9 | WIND RIVER above Dubios 7 125 135 | BOYSEN 596.0 474.8 450.8 502.6 | LITTLE WIND 2 151 187 | PILOT BUTTE 31.6 19.2 24.6 30.1 | POPO AGIE 6 151 161 | | WIND above Boysen Resv 14 143 155 | ================================================================================================================================== * 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.