Precipitation
Reservoirs
Streamflow
Water supply is estimated to be below normal this year. The following
values reflect the 50 percent chance yields for the May through September
runoff period. The Wind River above Bull Lake Creek is expected to yield
450,000 acre feet (88 percent of average). Wind River at Riverton will
yield about 470,000 acre feet (77 percent of average). Boysen Reservoir
inflow will yield about 530,000 acre feet (70 percent of normal). Bull
Lake Creek near Lenore is expected to yield about 140,000 acre feet (78
percent of average). Little Popo Agie River near Lander is expected to
yield about 20,000 acre feet (41 percent of average). South Fork of Little
Wind near Fort Washakie will yield about 54,000 acre feet (69 percent of
average). Little Wind River near Riverton will yield about 160,000 acre
feet (53 percent of average).
================================================================================================================================== WIND RIVER BASIN Streamflow Forecasts - May 1, 2000 ================================================================================================================================== | <<====== 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 abv Bull Lake Cr (2) MAY-SEP 374 419 | 450 88 | 481 526 511 | | WIND RIVER at Riverton (2) MAY-SEP 292 398 | 470 77 | 542 648 609 | | BOYSEN RESERVOIR Inflow (2) MAY-SEP 271 425 | 530 70 | 635 789 758 | | BULL LAKE CR near Lenore (2) MAY-SEP 111 128 | 140 78 | 152 169 179 | | LT POPO AGIE RIVER nr Lander MAY-SEP 6.3 14.4 | 20 41 | 26 34 49 | | SF LT WIND nr Fort Washakie MAY-SEP 34 46 | 54 69 | 62 74 78 | | LT WIND RIVER nr Riverton MAY-SEP 42 112 | 160 53 | 208 278 303 | | ================================================================================================================================== WIND RIVER BASIN | WIND RIVER BASIN Reservoir Storage (1000 AF) - End of April | Watershed Snowpack Analysis - May 1, 2000 ================================================================================================================================== 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 93.5 99.9 79.9 | WIND RIVER above Dubios 6 52 67 | BOYSEN 596.0 501.4 474.8 502.6 | LITTLE WIND 2 22 40 | PILOT BUTTE 31.6 25.0 19.2 30.1 | POPO AGIE 5 38 56 | | WIND above Boysen Resv 12 39 58 | ================================================================================================================================== * 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. BIGHORN RIVER BASIN as of May 1, 2000