Precipitation
Reservoir
Streamflow
Yields from 37 to 99 percent are expected in the basin during the forecast
period. The following yields are based on the fifty percent chance
probability runoff for the June through September forecast period. The
Sweetwater near Alcova is forecast to yield about 15,800 acre-feet (44
percent of average). Deer Creek at Glenrock is expected to yield about 99
percent of average (7,200 acre-feet). LaPrele Creek above the reservoir is
estimated to yield 79 percent of average (4,900 acre-feet). North Platte
River below Guernsey Reservoir is expected to yield about 64 percent of
normal (306,000 acre-feet), and below Glendo Reservoir is anticipated to
yield about 68 percent of average (315,000 acre-feet). Laramie River near
Woods should yield about 88 percent of average (78,000 acre-feet). The
Little Laramie near Filmore should produce about 21,000 acre-feet (44
percent of average).
================================================================================================================================== LOWER NORTH PLATTE, SWEETWATER & LARAMIE 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) ====================================================================|=======================|===================================== Sweetwater River nr Alcova JUN-JUL 4.7 7.5 | 11.6 37 | 15.7 22 31 JUN-SEP 6.5 10.7 | 15.8 44 | 21 28 36 | | Deer Creek at Glenrock JUN-SEP 3.53 5.56 | 7.20 99 | 9.05 12.16 7.25 | | La Prele Creek ab La Prele Reservoir JUN-SEP 1.69 3.33 | 4.90 79 | 6.90 10.73 6.20 | | North Platte River blw Glendo JUN-SEP 255 | 315 68 | 422 464 | | North Platte River blw Guernsey JUN-SEP 248 | 306 64 | 409 476 | | Laramie River nr Woods JUN-SEP 49 66 | 78 88 | 90 107 89 | | Little Laramie River nr Filmore JUN-SEP 12.3 17.5 | 21 44 | 25 30 48 | | ================================================================================================================================== LOWER NORTH PLATTE, SWEETWATER & LARAMIE RIVER BASINS | LOWER NORTH PLATTE, SWEETWATER & LARAMIE 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 ========================================================================|========================================================= ALCOVA 184.3 180.7 179.1 180.4 | SWEETWATER 1 1 0 | GLENDO 506.4 507.1 553.4 501.0 | DEER & LaPRELE CREEKS 2 0 0 | GUERNSEY 45.6 35.9 33.8 34.5 | N PLATTE abv Laramie R. 16 25 34 | PATHFINDER 1016.5 993.1 993.3 638.0 | LARAMIE RIVER abv Laramie 3 32 35 | SEMINOE 1016.7 914.2 842.9 551.0 | LITTLE LARAMIE RIVER 1 0 0 | WHEATLAND #2 98.9 81.0 90.0 54.6 | LARAMIE RIVER above mouth 4 22 26 | NORTH PLATTE PROJ 1062.1 1061.5 1061.5 909.8 | NORTH PLATTE 17 27 34 | KENDRICK PROJECT 1201.7 1047.4 1047.4 844.4 | | GLENDO PROJECT USERS 183.2 172.2 172.2 149.7 | | ================================================================================================================================== * 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.