Streamflow
All the following yields are based on the fifty percent chance June through
September yield. Yield for the North Platte River near Northgate is
expected to be about 170,000 acre-feet (108 percent of average). Encampment
River near Encampment is estimated to yield 117,000 acre-feet (114 percent
of normal). North Platte River near Sinclair will yield about 472,000 acre-
feet (110 percent of normal). Rock Creek near Arlington is estimated to
yield 34,000 acre-feet (81 percent of average). Medicine Bow River above
Seminoe Reservoir is expected to yield about 63,000 acre-feet (98 percent of
normal). Seminoe Reservoir inflow should be about (530,000 acre-feet (108
percent of normal). See the following table for more detailed information
on projected runoff.
================================================================================================================================== UPPER NORTH PLATTE RIVER BASIN Streamflow Forecasts - June 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 JUN-SEP 133 155 | 170 108 | 185 207 158 | | Encampment River nr Encampment JUN-SEP 86 104 | 117 114 | 130 148 103 | | North Platte River nr Sinclair JUN-SEP 365 429 | 472 110 | 515 579 431 | | Rock Creek nr Arlington JUN-SEP 30 33 | 34 81 | 36 38 42 | | Medicine Bow River ab Seminoe Reserv JUN-SEP 44 55 | 63 98 | 72 86 64 | | Seminoe Reservoir Inflow JUN-JUL 364 427 | 470 110 | 513 574 428 JUN-SEP 354 460 | 530 108 | 600 704 491 | | ================================================================================================================================== UPPER NORTH PLATTE RIVER BASIN | UPPER NORTH PLATTE RIVER BASIN Reservoir Storage (1000 AF) - End of May | Watershed Snowpack Analysis - June 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 1016.7 842.9 777.2 551.0 | N PLATTE above Northgate 5 153 100 | | ENCAMPMENT RIVER 3 140 127 | | BRUSH CREEK 2 201 190 | | MEDICINE BOW & ROCK CREEK 2 268 156 | | N PLATTE above Seminoe 13 176 128 | ================================================================================================================================== * 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.