Streamflow
The following runoff values are for the 50 percent probability during
the April through September forecast period. The estimated yield for
Tongue River near Dayton is 105,000 acre-feet (91 percent of normal).
Water users on the Middle Fork near Barnum should have a yield near
9,000 acre-feet (46 percent of normal). The North Fork of the Powder
near Hazelton should yield about 6,900 acre-feet (68 percent of
normal). The estimated yield for Clear Creek near Buffalo is 29,500
acre-feet (76 percent of average). Rock Creek near Buffalo will
yield about 20,000 acre-feet (83 percent of normal), and Piney Creek
at Kearny should yield about 43,000 acre-feet (84 percent of
average).
================================================================================================================================== POWDER & TONGUE RIVER BASINS 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) ====================================================================|=======================|===================================== TONGUE RIVER nr Dayton (2) APR-SEP 76 93 | 105 91 | 117 134 115 | | MIDDLE FORK POWDER nr Barnum APR-SEP 1.8 6.1 | 9.0 46 | 11.9 16.2 19.7 | | NORTH FORK POWDER nr Hazelton APR-SEP 4.3 5.9 | 6.9 68 | 7.9 9.5 10.1 | | CLEAR CREEK nr Buffalo APR-SEP 17.8 25 | 30 76 | 34 41 39 | | ROCK CREEK nr Buffalo APR-SEP 14.4 17.7 | 20 83 | 22 26 24 | | PINEY CREEK at Kearny APR-SEP 16.2 32 | 43 84 | 54 70 51 | | ================================================================================================================================== POWDER & TONGUE RIVER BASINS | POWDER & TONGUE RIVER BASINS 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 ========================================================================|========================================================= TONGUE RIVER 68.0 36.6 7.8 30.1 | UPPER TONGUE RIVER 8 106 93 | | GOOSE CREEK 2 105 85 | | CLEAR CREEK 4 109 92 | | CRAZY WOMAN CREEK 3 82 78 | | UPPER POWDER RIVER 4 86 82 | | POWDER RIVER in WY 8 96 87 | ================================================================================================================================== * 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.