Precipitation
Reservoir
Streamflow
Yields from 17 to 58 percent are expected in the basin during the forecast period. The following yields are based on the
fifty percent chance probability runoff for the April through September forecast period. The Sweetwater near Alcova is
forecast to yield about 38,000 acre-feet (48 percent of average). Deer Creek at Glenrock is expected to yield about 17
percent of average (7,000 acre-feet). LaPrele Creek above the reservoir is estimated to yield 17 percent of average
(4,000 acre-feet). North Platte River below Guernsey Reservoir is expected to yield about 39 percent of normal
(398,000 acre-feet), and below Glendo Reservoir is anticipated to yield about 40 percent of average (392,000 acre-feet).
Laramie River near Woods should yield about 58 percent of average (78,000 acre-feet). The Little Laramie near
Filmore should produce about 27,000 acre-feet (42 percent of average).
================================================================================================================================== LOWER NORTH PLATTE, SWEETWATER & LARAMIE RIVER BASINS Streamflow Forecasts - February 1, 2002 ================================================================================================================================== | <<====== 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 APR-JUL 13.6 26 | 35 47 | 53 81 74 APR-SEP 15.3 29 | 38 48 | 57 85 80 | | Deer Creek at Glenrock APR-SEP 2.7 4.8 | 7.0 17 | 12.3 23 41 | | La Prele Creek ab La Prele Reservoir APR-SEP 1.0 1.8 | 4.0 17 | 8.5 19.7 24 | | Alcova to Orin Gain APR-JUL 4.0 9.0 | 12.0 8 | 50 107 152 APR-SEP 5.0 10.0 | 13.0 8 | 52 110 161 | | North Platte River blw Glendo Reserv APR-JUL 281 345 | 389 41 | 496 652 960 APR-SEP 281 347 | 392 40 | 504 670 990 | | North Platte River blw Guernsey Resv APR-JUL 254 330 | 382 39 | 515 710 970 APR-SEP 265 344 | 398 39 | 536 738 1010 | | Laramie River nr Woods APR-SEP 40 62 | 78 58 | 105 144 135 | | Little Laramie River nr Filmore APR-SEP 18.3 24 | 27 42 | 35 48 64 | | ================================================================================================================================== LOWER NORTH PLATTE, SWEETWATER & LARAMIE RIVER BASINS | LOWER NORTH PLATTE, SWEETWATER & LARAMIE RIVER BASINS Reservoir Storage (1000 AF) - End of January | Watershed Snowpack Analysis - February 1, 2002 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= ALCOVA 184.3 156.8 156.6 155.0 | SWEETWATER 3 133 74 | GLENDO 506.4 283.0 283.5 334.9 | DEER & LaPRELE CREEKS 3 43 44 | GUERNSEY 45.6 13.2 12.8 9.1 | N PLATTE abv Laramie R. 25 80 62 | PATHFINDER 1016.5 502.7 728.1 678.3 | LARAMIE RIVER abv Laramie 8 66 49 | SEMINOE 1016.7 480.0 680.9 573.2 | LITTLE LARAMIE RIVER 4 58 39 | WHEATLAND #2 98.9 19.0 34.0 45.3 | LARAMIE RIVER above mouth 11 64 46 | NORTH PLATTE PROJ 1062.1 286.6 584.9 601.0 | NORTH PLATTE 31 76 58 | KENDRICK PROJECT 1201.7 828.6 971.2 819.1 | | GLENDO PROJECT USERS 183.2 134.5 136.3 119.8 | | ================================================================================================================================== * 90%, 70%, 30%, and 10% chances of exceeding are the probabilities that the actual volume will exceed the volumes in the table. (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.