Streamflow The following forecast is based on the fifty-percent chance April through July runoff in the Upper Green River basin. Runoff is forecast to be below average. Green River at Warren Bridge is expected to yield about 215,000 acre-feet (81 percent of normal). Pine Creek above Fremont Lake is expected to yield 82,000 acre-feet (79 percent of normal). New Fork River near Big Piney is expected to yield about 290,000 acre-feet (73 percent of normal). Fontenelle Reservoir Inflow is estimated to be 590,000 acre-feet (69 percent of average), and Big Sandy near Farson is expected to be about 46,000 acre-feet (79 percent of normal).
================================================================================================================================== UPPER GREEN RIVER BASIN 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) ====================================================================|=======================|===================================== Green River at Warren Bridge APR-JUL 154 190 | 215 81 | 240 276 265 | | Pine Creek abv Fremont Lake APR-JUL 64 75 | 82 79 | 89 100 104 | | New Fork River nr Big Piney APR-JUL 166 240 | 290 73 | 340 414 395 | | Fontenelle Reservoir Inflow APR-JUL 418 517 | 590 69 | 668 792 860 | | Big Sandy River nr Farson APR-JUL 28 39 | 46 79 | 53 64 58 | | ================================================================================================================================== UPPER GREEN RIVER BASIN | UPPER GREEN RIVER BASIN 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 ========================================================================|========================================================= BIG SANDY 38.3 3.1 5.5 18.6 | GREEN above Warren Bridge 4 140 84 | EDEN 11.8 0.5 --- 3.2 | UPPER GREEN (West Side) 7 137 80 | FLAMING GORGE 3749.0 2854.1 2992.0 2966.0 | NEW FORK RIVER 3 109 84 | FONTENELLE 344.8 141.2 120.4 182.2 | BIG SANDY/EDEN VALLEY 1 131 89 | | GREEN above Fontenelle 14 132 82 | ================================================================================================================================== * 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.