Precipitation
Reservoir
Streamflow
The fifty-percent chance April through July runoff in the Upper Green River
basin is forecast much below average. Green River at Warren Bridge is
expected to yield about 175,000 acre-feet (66 percent of normal). Pine
Creek above Fremont Lake is expected to yield 80,000 acre-feet (77 percent
of normal). New Fork River near Big Piney is expected to yield about
240,000 acre-feet (62 percent of normal). Fontenelle Reservoir Inflow is
estimated to be 450,000 acre-feet (53 percent of average), and Big Sandy
near Farson is expected to be about 38,000 acre-feet (67 percent of normal).
================================================================================================================================== UPPER GREEN RIVER BASIN Streamflow Forecasts - May 1, 2001 ================================================================================================================================== | <<====== 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 138 160 | 175 66 | 190 212 266 | | Pine Creek abv Fremont Lake APR-JUL 67 75 | 80 77 | 85 93 104 MAY-JUL 66 74 | 79 78 | 84 92 101 | | New Fork River nr Big Piney APR-JUL 155 206 | 240 62 | 274 325 385 | | Fontenelle Reservoir Inflow APR-JUL 346 406 | 450 53 | 496 567 849 | | Big Sandy River nr Farson APR-JUL 24 32 | 38 67 | 44 52 57 | | ================================================================================================================================== UPPER GREEN RIVER BASIN | UPPER GREEN RIVER BASIN Reservoir Storage (1000 AF) - End of April | Watershed Snowpack Analysis - May 1, 2001 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= BIG SANDY NO REPORT | GREEN above Warren Bridge 4 89 47 | EDEN NO REPORT | UPPER GREEN (West Side) 7 82 58 | FLAMING GORGE 3749.0 3041.2 3196.9 --- | NEWFORK RIVER 3 132 68 | FONTENELLE 344.8 117.2 118.6 161.8 | BIG SANDY/EDEN VALLEY 2 94 67 | | GREEN above Fontenelle 14 87 57 | ================================================================================================================================== * 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.