Streamflow
The 50 percent chance April through September runoff is anticipated to be below normal. The Boysen
Reservoir inflow is forecast to yield 440,000 acre feet (54 percent of average); the Greybull River nr Meeteese
should yield 85,000 acre feet (43 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 560,000 acre feet (51 percent of average).
================================================================================================================================== BIGHORN RIVER BASIN Streamflow Forecasts - January 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) ====================================================================|=======================|===================================== BOYSEN RESERVOIR Inflow (2) APR-SEP 88 298 | 440 54 | 582 792 809 | | GREYBULL RIVER nr Meeteetse APR-SEP 53 72 | 85 43 | 98 117 200 | | SHELL CREEK nr Shell APR-SEP 26 33 | 37 51 | 41 48 72 | | BIGHORN RIVER at Kane (2) APR-SEP 51 354 | 560 51 | 766 1069 1110 | | ================================================================================================================================== BIGHORN RIVER BASIN | BIGHORN RIVER BASIN Reservoir Storage (1000 AF) - End of December | Watershed Snowpack Analysis - January 1, 2002 ================================================================================================================================== 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 82.8 457.1 620.4 | NOWOOD RIVER 2 101 69 | BIGHORN LAKE 1356.0 753.1 881.0 911.1 | GREYBULL RIVER 2 105 51 | | SHELL CREEK 3 116 85 | | BIGHORN (Boysen-Bighorn) 7 111 74 | ================================================================================================================================== * 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.