Precipitation
Reservoir
Streamflow
The following runoff values are for the 50 percent probability during
the June through September forecast period. The estimated yield for
Tongue River near Dayton is 63,000 acre-feet (82 percent of normal).
The North Fork of the Powder near Hazelton should yield about 3,400
acre-feet (57 percent of normal). The estimated yield for Clear
Creek near Buffalo is 15,000 acre-feet (54 percent of average). Rock
Creek near Buffalo will yield about 11,000 acre-feet (66 percent of
normal), and Piney Creek at Kearny should yield about 25,000 acre-
feet (78 percent of average).
================================================================================================================================== POWDER & TONGUE RIVER BASINS Streamflow Forecasts - June 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) JUN-SEP 47 57 | 63 82 | 69 79 77 | | NORTH FORK POWDER nr Hazelton JUN-SEP 1.91 2.80 | 3.40 57 | 4.00 4.89 6.00 | | CLEAR CREEK nr Buffalo JUN-SEP 4.1 10.6 | 15.0 54 | 19.4 26 28 | | ROCK CREEK nr Buffalo JUN-SEP 7.1 9.4 | 11.0 66 | 12.6 14.9 16.8 | | PINEY CREEK at Kearny JUN-SEP 16.3 22 | 25 78 | 29 34 32 | | ================================================================================================================================== POWDER & TONGUE RIVER BASINS | POWDER & TONGUE RIVER BASINS Reservoir Storage (1000 AF) - End of May | Watershed Snowpack Analysis - June 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 79.4 65.0 48.2 | UPPER TONGUE RIVER 5 23 32 | | GOOSE CREEK 1 0 0 | | CLEAR CREEK 2 32 53 | | CRAZY WOMAN CREEK 1 0 0 | | UPPER POWDER RIVER 3 0 0 | | POWDER RIVER in WY 5 21 37 | ================================================================================================================================== * 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. BELLE FOURCHE & CHEYENNE RIVER BASINS as of June 1, 2000