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 98,000 acre-feet (85 percent
of normal). Water users on the Middle Fork near Barnum should have a yield near 11,800 acre-feet (60 percent of normal). The North Fork of the Powder near Hazelton should yield about 7,000
acre-feet (69 percent of normal). The estimated yield for Clear Creek near Buffalo is 31,000 acre-feet (80 percent of average). Rock Creek near Buffalo will yield about 17,500 acre-feet (73 percent
of normal), and Piney Creek at Kearny should yield about 39,000 acre-feet (77 percent of average).
================================================================================================================================== POWDER & TONGUE RIVER BASINS Streamflow Forecasts - January 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 67 86 | 98 85 | 110 129 115 | | MIDDLE FORK POWDER nr Barnum APR-SEP 4.1 8.7 | 11.8 60 | 14.9 19.5 19.7 | | NORTH FORK POWDER nr Hazelton APR-SEP 4.4 6.0 | 7.0 69 | 8.0 9.6 10.1 | | CLEAR CREEK nr Buffalo APR-SEP 22 28 | 31 80 | 35 40 39 | | ROCK CREEK nr Buffalo APR-SEP 11.6 15.1 | 17.5 73 | 19.9 23 24 | | PINEY CREEK at Kearny APR-SEP 13.5 29 | 39 77 | 49 65 51 | | ================================================================================================================================== POWDER & TONGUE RIVER BASINS | POWDER & TONGUE RIVER BASINS Reservoir Storage (1000 AF) - End of December | Watershed Snowpack Analysis - January 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 35.9 5.8 26.0 | UPPER TONGUE RIVER 5 98 85 | | GOOSE CREEK 1 76 67 | | CLEAR CREEK 2 95 103 | | CRAZY WOMAN CREEK 1 90 84 | | UPPER POWDER RIVER 3 96 74 | | POWDER RIVER in WY 5 96 85 | ================================================================================================================================== * 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. (3) - Forecasts produced in cooperation with Alberta Forecasting Staff Canada