Streamflow
The 50 percent chance April through September runoff is anticipated to
be below normal. The Boysen Reservoir inflow is forecast to yield
500,000 acre feet (62 percent of average); the Greybull River nr
Meeteese should yield 95,000 acre feet (47 percent of average); Shell
Creek near Shell should yield 56,000 acre feet (75 percent of average)
and the Bighorn River at Kane should yield 550,000 acre feet (49
percent of average).
================================================================================================================================== BIGHORN RIVER BASIN Streamflow Forecasts - February 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) APR-SEP 299 421 | 500 62 | 630 822 809 | | GREYBULL RIVER nr Meeteetse APR-SEP 78 88 | 95 47 | 109 129 201 | | SHELL CREEK nr Shell APR-SEP 45 51 | 56 75 | 61 67 75 | | BIGHORN RIVER at Kane (2) APR-SEP 315 450 | 550 49 | 745 1034 1124 | | ================================================================================================================================== BIGHORN RIVER BASIN | BIGHORN RIVER BASIN Reservoir Storage (1000 AF) - End of January | Watershed Snowpack Analysis - February 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 596.0 445.5 531.3 580.7 | NOWOOD RIVER 5 59 47 | BIGHORN LAKE 1356.0 865.0 941.9 839.2 | GREYBULL RIVER 2 89 46 | | SHELL CREEK 4 59 60 | | BIGHORN (Boysen-Bighorn) 11 61 53 | ================================================================================================================================== * 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.