Precipitation
Reservoirs
Streamflow
All the following yields are based on the fifty percent chance May through
September yield. Yield for the North Platte River near Northgate is
expected to be about 218,000 acre-feet (96 percent of average). Encampment
River near Encampment is estimated to yield 160,000 acre-feet (108 percent
of normal). North Platte River near Sinclair will yield about 636,000 acre-
feet (101 percent of normal). Rock Creek near Arlington is estimated to
yield 50,000 acre-feet (91 percent of average). Medicine Bow River above
Seminoe Reservoir is expected to yield about 127,000 acre-feet (121 percent
of normal). Seminoe Reservoir inflow should be about (761,000 acre-feet
(104 percent of normal). See the following table for more detailed
information on projected runoff.
================================================================================================================================== UPPER NORTH PLATTE RIVER BASIN Streamflow Forecasts - May 1, 1999 ================================================================================================================================== | <<====== 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 MAY-SEP 150 191 | 218 96 | 245 286 228 | | Encampment River nr Encampment MAY-SEP 125 146 | 160 108 | 174 195 148 | | North Platte River nr Sinclair MAY-SEP 462 566 | 636 101 | 706 810 631 | | Rock Creek nr Arlington MAY-SEP 41 46 | 50 91 | 54 60 55 | | Medicine Bow River ab Seminoe Reserv MAY-SEP 77 105 | 127 121 | 151 190 105 | | Seminoe Reservoir Inflow MAY-JUL 507 617 | 692 103 | 767 877 671 MAY-SEP 559 679 | 761 104 | 843 963 733 | | ================================================================================================================================== UPPER NORTH PLATTE RIVER BASIN | UPPER NORTH PLATTE RIVER BASIN Reservoir Storage (1000 AF) - End of April | Watershed Snowpack Analysis - May 1, 1999 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= SEMINOE 1016.7 719.8 690.4 392.0 | N PLATTE above Northgate 8 110 96 | | ENCAMPMENT RIVER 4 111 100 | | BRUSH CREEK 5 126 111 | | MEDICINE BOW & ROCK CREEK 3 128 107 | | N PLATTE above Seminoe 20 117 103 | ================================================================================================================================== * 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.