Streamflow
The 50 percent chance April through September runoff is anticipated to
be below normal. The Boysen Reservoir inflow is forecast to yield
575,000 acre feet (71 percent of average); the Greybull River nr
Meeteese should yield 120,000 acre feet (60 percent of average); Shell
Creek near Shell should yield 62,000 acre feet (83 percent of average)
and the Bighorn River at Kane should yield 840,000 acre feet (75
percent of average).
================================================================================================================================== BIGHORN RIVER BASIN Streamflow Forecasts - January 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 223 433 | 575 71 | 717 927 809 | | GREYBULL RIVER nr Meeteetse APR-SEP 88 107 | 120 60 | 133 152 201 | | SHELL CREEK nr Shell APR-SEP 51 58 | 62 83 | 66 73 75 | | BIGHORN RIVER at Kane (2) APR-SEP 382 634 | 840 75 | 1046 1304 1124 | | ================================================================================================================================== BIGHORN RIVER BASIN | BIGHORN RIVER BASIN Reservoir Storage (1000 AF) - End of December | Watershed Snowpack Analysis - January 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 596.0 457.1 547.0 613.5 | NOWOOD RIVER 2 82 68 | BIGHORN LAKE 1356.0 881.0 960.3 891.8 | GREYBULL RIVER 2 154 57 | | SHELL CREEK 3 77 72 | | BIGHORN (Boysen-Bighorn) 7 84 68 | ================================================================================================================================== * 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.