Streamflow
All the following yields are based on the fifty percent chance April through September yield. Yield for the North Platte River near Northgate is expected to be about 156,000 acre-feet (58 percent of
average). Encampment River near Encampment is estimated to yield 63,000 acre-feet (40 percent of normal). North Platte River near Sinclair will yield about 358,000 acre-feet (50 percent of normal).
Rock Creek near Arlington is estimated to yield 44,000 acre-feet (79 percent of average). Medicine Bow River above Seminoe Reservoir is expected to yield about 57,000 acre-feet (45 percent of normal).
Seminoe Reservoir inflow should be about (423,000 acre-feet (50 percent of normal). See the following table for more detailed information on projected runoff.
================================================================================================================================== UPPER NORTH PLATTE RIVER BASIN 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) ====================================================================|=======================|===================================== North Platte River nr Northgate APR-SEP 10.0 97 | 156 58 | 215 302 271 | | Encampment River nr Encampment APR-SEP 23 34 | 63 40 | 92 135 156 | | North Platte River nr Sinclair APR-SEP 137 205 | 358 50 | 511 735 719 | | Rock Creek nr Arlington APR-SEP 26 36 | 44 79 | 53 67 56 | | Medicine Bow River ab Seminoe Reserv APR-SEP 12.0 35 | 57 45 | 85 136 127 | | Seminoe Reservoir inflow APR-JUL 150 215 | 382 49 | 549 795 788 APR-SEP 162 243 | 423 50 | 603 868 851 | | ================================================================================================================================== UPPER NORTH PLATTE RIVER BASIN | UPPER NORTH PLATTE RIVER BASIN 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 ========================================================================|========================================================= SEMINOE 1016.7 845.6 756.7 542.0 | N PLATTE above Northgate 5 101 68 | | ENCAMPMENT RIVER 3 86 54 | | BRUSH CREEK 2 101 96 | | MEDICINE BOW & ROCK CREEK 2 73 53 | | N PLATTE above Seminoe 13 91 65 | ================================================================================================================================== * 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