Precipitation
Reservoirs
Streamflow
The entire drainage basin is expected to have below average runoff. The April
through September 50 percent chance yield for the North Platte River near the
Colorado state line is expected to be 225,000 acre feet (83 percent of average).
Encampment River near Encampment is estimated to yield 145,000 acre feet (93
percent of normal). North Platte River near Sinclair will yield about 620,000
acre feet (about 86 percent of normal). Rock Creek near Arlington is estimated
to yield 48,000 acre feet (about 86 percent of average). Medicine Bow River
above Seminoe Reservoir is expected to yield about 85,000 acre feet (about 67
percent of normal). Seminoe Reservoir inflow should be about (705,000 acre
feet (83 percent of normal). See the following table for more detailed
information on projected runoff.
================================================================================================================================== UPPER NORTH PLATTE RIVER BASIN Streamflow Forecasts - April 1, 1998 ================================================================================================================================== | <<====== 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 129 186 | 225 83 | 264 321 271 | | Encampment River nr Encampment APR-SEP 107 130 | 145 93 | 160 183 156 | | North Platte River nr Sinclair APR-SEP 384 525 | 620 86 | 715 856 719 | | Rock Creek nr Arlington APR-SEP 36 43 | 48 86 | 54 62 56 | | Medicine Bow River ab Seminoe Reserv APR-SEP 35 62 | 85 67 | 112 157 127 | | Seminoe Reservoir Inflow APR-JUL 402 556 | 660 84 | 764 918 788 APR-SEP 426 592 | 705 83 | 818 984 851 | | ================================================================================================================================== UPPER NORTH PLATTE RIVER BASIN | UPPER NORTH PLATTE RIVER BASIN Reservoir Storage (1000 AF) - End of March | Watershed Snowpack Analysis - April 1, 1998 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= SEMINOE 1016.7 766.4 640.3 368.0 | N PLATTE above Northgate 8 72 84 | | ENCAMPMENT RIVER 4 71 88 | | BRUSH CREEK 5 78 93 | | MEDICINE BOW & ROCK CREEK 3 70 82 | | N PLATTE above Seminoe 20 73 87 | ================================================================================================================================== * 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.