Precipitation
Reservoir
Streamflow
The fifty-percent chance April through July runoff in the Upper Green River basin is forecast much
below average. Irrigators without a storage facility may experience water shortage. Green River at
Warren Bridge is expected to yield about 155,000 acre-feet (58 percent of normal). Pine Creek above
Fremont Lake is expected to yield 65,000 acre-feet (63 percent of normal). New Fork River near Big
Piney is expected to yield about 225,000 acre-feet (58 percent of normal). Fontenelle Reservoir Inflow
is estimated to be 335,000 acre-feet (40 percent of average), and Big Sandy near Farson is expected to
be about 32,000 acre-feet (56 percent of normal).
================================================================================================================================== UPPER GREEN RIVER BASIN Streamflow Forecasts - June 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 120 141 | 155 58 | 169 190 266 | | Pine Creek abv Fremont Lake APR-JUL 52 60 | 65 63 | 70 78 104 JUN-JUL 36 41 | 45 53 | 52 61 85 | | New Fork River nr Big Piney APR-JUL 160 199 | 225 58 | 251 290 385 | | Fontenelle Reservoir Inflow APR-JUL 260 303 | 335 40 | 368 420 849 | | Big Sandy River nr Farson APR-JUL 24 29 | 32 56 | 35 40 57 | | ================================================================================================================================== UPPER GREEN RIVER BASIN | UPPER GREEN RIVER BASIN Reservoir Storage (1000 AF) - End of May | Watershed Snowpack Analysis - June 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 38.3 19.6 33.1 28.3 | GREEN above Warren Bridge 4 0 0 | EDEN 11.8 2.8 5.3 7.8 | UPPER GREEN (West Side) 5 0 0 | FLAMING GORGE NO REPORT | NEWFORK RIVER 2 0 0 | FONTENELLE 344.8 158.5 187.1 195.5 | BIG SANDY/EDEN VALLEY 1 0 0 | | GREEN above Fontenelle 11 0 0 | ================================================================================================================================== * 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.