Streamflow
The 50 percent chance April through September runoff is anticipated to be below normal. The Boysen
Reservoir inflow is forecast to yield 455,000 acre feet (56 percent of average); the Greybull River nr Meeteese
should yield 90,000 acre feet (45 percent of average); Shell Creek near Shell should yield 37,000 acre feet (51
percent of average) and the Bighorn River at Kane should yield 575,000 acre feet (52 percent of average).
================================================================================================================================== SHOSHONE & CLARKS FORK RIVER BASINS Streamflow Forecasts - February 1, 2002 ================================================================================================================================== | <<====== 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) ====================================================================|=======================|===================================== NF SHOSHONE RIVER at Wapiti APR-SEP 255 309 | 345 66 | 381 435 520 | | SF SHOSHONE RIVER nr Valley APR-SEP 95 128 | 150 57 | 172 205 265 | | SF SHOSHONE RIVER abv Buffalo Bill APR-SEP 37 83 | 115 51 | 147 193 225 | | BUFFALO BILL DAM Inflow (2) APR-SEP 322 437 | 515 64 | 593 708 805 | | CLARKS FORK RIVER nr Belfry APR-SEP 290 350 | 390 66 | 430 490 595 | | ================================================================================================================================== SHOSHONE & CLARKS FORK RIVER BASINS | SHOSHONE & CLARKS FORK RIVER BASINS Reservoir Storage (1000 AF) - End of January | Watershed Snowpack Analysis - February 1, 2002 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= BUFFALO BILL 646.6 280.2 370.2 292.6 | SHOSHONE RIVER 6 171 75 | | CLARKS FORK in WY 7 166 79 | ================================================================================================================================== * 90%, 70%, 30%, and 10% chances of exceeding are the probabilities that the actual volume will exceed the volumes in the table. (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.