Streamflow
The remaining of the runoff season (April - September) should yield below
average runoff. The Wind River below Boysen is forecast to yield 760,000
acre feet (94 percent of average); the Nowood River near Ten Sleep should
yield near 54,000 acre feet (93 percent of normal); the Greybull River
near Meeteese should yield 190,000 acre feet (95 percent of average); Shell
Creek near Shell should yield 70,000 acre feet (93 percent of average) and
the Bighorn River at Kane should yield 1,100,000 acre feet (98 percent of
average).
================================================================================================================================== BIGHORN RIVER BASIN Streamflow Forecasts - March 1, 1998 ================================================================================================================================== | <<====== 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) ====================================================================|=======================|===================================== WIND RIVER below Boysen (2) APR-SEP 438 630 | 760 94 | 890 1082 809 | | NOWOOD RIVER near Tensleep APR-SEP 23 42 | 54 93 | 66 85 58 | | GREYBULL RIVER at Meeteetse APR-SEP 148 173 | 190 95 | 207 232 201 | | SHELL CREEK near Shell APR-SEP 59 66 | 70 93 | 74 81 75 | | BIGHORN RIVER at Kane (2) APR-SEP 674 912 | 1100 98 | 1288 1517 1124 | | ================================================================================================================================== BIGHORN RIVER BASIN | BIGHORN RIVER BASIN Reservoir Storage (1000 AF) - End of February | Watershed Snowpack Analysis - March 1, 1998 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= BOYSEN 596.0 531.2 524.0 555.2 | NOWOOD RIVER 5 66 84 | BIGHORN LAKE 1356.0 867.6 762.4 810.4 | GREYBULL RIVER 2 87 130 | | SHELL CREEK 4 78 93 | | BIGHORN (Boysen-Bighorn) 11 74 94 | ================================================================================================================================== * 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.