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 79,000-acre feet (69 percent of normal).
Middle Fork of the Powder River near Barnum is estimated to yield
9,600-acre feet (49 percent of average). 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 15,000 acre-feet (63 percent of normal), and Piney Creek at
Kearny should yield about 31,000 acre-feet (61 percent of average).
================================================================================================================================== POWDER & TONGUE RIVER BASINS Streamflow Forecasts - February 1, 2001 ================================================================================================================================== | <<====== 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 59 70 | 79 69 | 91 109 115 | | MIDDLE FORK POWDER nr Barnum APR-SEP 5.9 8.1 | 9.6 49 | 12.7 17.2 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 19.1 24 | 27 69 | 30 35 39 | | ROCK CREEK nr Buffalo APR-SEP 9.7 12.9 | 15.0 63 | 17.1 20 24 | | PINEY CREEK at Kearny APR-SEP 14.8 25 | 31 61 | 42 57 51 | | ================================================================================================================================== POWDER & TONGUE RIVER BASINS | POWDER & TONGUE RIVER BASINS Reservoir Storage (1000 AF) - End of January | Watershed Snowpack Analysis - February 1, 2001 ================================================================================================================================== 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 34.0 36.6 27.1 | UPPER TONGUE RIVER 8 37 62 | | GOOSE CREEK 2 19 63 | | CLEAR CREEK 4 61 53 | | CRAZY WOMAN CREEK 3 50 38 | | UPPER POWDER RIVER 4 71 53 | | POWDER RIVER in WY 8 66 53 | ================================================================================================================================== * 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.