Precipitation
Reservoir
Streamflow
The 50 percent chance May through September runoff is anticipated to
be below normal. The Boysen Reservoir inflow is forecast to yield
320,000 acre feet (42 percent of average); the Greybull River nr
Meeteese should yield 80,000 acre feet (41 percent of average); Shell
Creek near Shell should yield 52,000 acre feet (72 percent of average)
and the Bighorn River at Kane should yield 445,000 acre feet (43
percent of average).
================================================================================================================================== BIGHORN RIVER BASIN Streamflow Forecasts - May 1, 2001 ================================================================================================================================== | <<====== 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) ====================================================================|=======================|===================================== BOYSEN RESERVOIR Inflow (2) MAY-SEP 211 276 | 320 42 | 425 579 758 | | GREYBULL RIVER nr Meeteetse MAY-SEP 64 73 | 80 41 | 96 120 195 | | SHELL CREEK nr Shell MAY-SEP 42 48 | 52 72 | 56 63 72 | | BIGHORN RIVER at Kane (2) MAY-SEP 283 379 | 445 43 | 598 822 1039 | | ================================================================================================================================== BIGHORN RIVER BASIN | BIGHORN RIVER BASIN Reservoir Storage (1000 AF) - End of April | Watershed Snowpack Analysis - May 1, 2001 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= BOYSEN 596.0 437.3 501.4 502.6 | NOWOOD RIVER 5 97 59 | BIGHORN LAKE 1356.0 841.2 877.6 789.2 | GREYBULL RIVER 2 60 31 | | SHELL CREEK 4 78 70 | | BIGHORN (Boysen-Bighorn) 11 82 61 | ================================================================================================================================== * 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.