Precipitation
Reservoir
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 100,000 acre-feet (87 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 27,000
acre-feet (69 percent of average). Rock Creek near Buffalo will
yield about 29,500 acre-feet (81 percent of normal), and Piney Creek
at Kearny should yield about 42,500 acre-feet (83 percent of
average).
================================================================================================================================== POWDER & TONGUE RIVER BASINS Streamflow Forecasts - April 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 72 89 | 100 87 | 111 128 115 | | MIDDLE FORK POWDER nr Barnum APR-SEP 1.9 6.1 | 9.0 46 | 11.9 16.1 19.7 | | NORTH FORK POWDER nr Hazelton APR-SEP 4.3 5.8 | 6.9 68 | 8.0 9.5 10.1 | | CLEAR CREEK nr Buffalo APR-SEP 18.3 24 | 27 69 | 31 36 39 | | ROCK CREEK nr Buffalo APR-SEP 12.7 16.7 | 19.5 81 | 22 26 24 | | PINEY CREEK at Kearny APR-SEP 16.8 32 | 43 83 | 53 68 51 | | ================================================================================================================================== POWDER & TONGUE RIVER BASINS | POWDER & TONGUE RIVER BASINS Reservoir Storage (1000 AF) - End of March | Watershed Snowpack Analysis - April 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 36.9 12.3 36.1 | UPPER TONGUE RIVER 8 111 90 | | GOOSE CREEK 2 109 83 | | CLEAR CREEK 4 106 85 | | CRAZY WOMAN CREEK 3 98 81 | | UPPER POWDER RIVER 4 100 85 | | POWDER RIVER in WY 8 103 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.