Streamflow
The 50 percent chance April through September runoff is anticipated
to be well below normal. The Boysen Reservoir inflow is forecast to
yield 590,000 acre feet (73 percent of average); the Greybull River
at Meeteese should yield 145,000 acre feet (72 percent of average);
Shell Creek near Shell should yield 68,000 acre feet (91 percent of
average) and the Bighorn River at Kane should yield 775,000 acre feet
(69 percent of average).
================================================================================================================================== BIGHORN RIVER BASIN Streamflow Forecasts - March 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) ====================================================================|=======================|===================================== BOYSEN RESERVOIR Inflow (2) APR-SEP 268 460 | 590 73 | 720 912 809 | | GREYBULL RIVER nr Meeteetse APR-SEP 111 131 | 145 72 | 159 179 201 | | SHELL CREEK nr Shell APR-SEP 57 64 | 68 91 | 73 79 75 | | BIGHORN RIVER at Kane (2) APR-SEP 309 587 | 775 69 | 963 1241 1124 | | ================================================================================================================================== BIGHORN RIVER BASIN | BIGHORN RIVER BASIN Reservoir Storage (1000 AF) - End of February | Watershed Snowpack Analysis - March 1, 2000 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= BOYSEN 596.0 527.3 550.0 555.2 | NOWOOD RIVER 5 82 81 | BIGHORN LAKE 1356.0 935.3 800.2 810.4 | GREYBULL RIVER 2 49 59 | | SHELL CREEK 4 89 98 | | BIGHORN (Boysen-Bighorn) 11 81 86 | ================================================================================================================================== * 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.