Streamflow
The fifty percent chance April through July runoff in the Upper Green River
basin is forecast above average. Green River at Warren Bridge is expected
to yield about 310,000 acre-feet (117 percent of normal). Pine Creek above
Fremont Lake is expected to yield 110,000 acre-feet (106 percent of normal).
New Fork River near Big Piney is expected to yield about 450,000 acre-feet
(117 percent of normal). Big Sandy near Farson is expected to be about
65,000 acre-feet (114 percent of normal).
================================================================================================================================== UPPER GREEN RIVER BASIN Streamflow Forecasts - May 1, 1999 ================================================================================================================================== | <<====== 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 271 295 | 310 117 | 325 351 266 | | Pine Creek abv Fremont Lake APR-JUL 97 105 | 110 106 | 115 123 104 MAY-JUL 96 104 | 109 108 | 114 122 101 | | New Fork River nr Big Piney APR-JUL 354 416 | 450 117 | 484 547 385 | | Fontenelle Reservoir Inflow APR-JUL 824 963 | 1030 121 | 1099 1240 849 | | Big Sandy River nr Farson APR-JUL 51 59 | 65 114 | 71 79 57 | | ================================================================================================================================== UPPER GREEN RIVER BASIN | UPPER GREEN RIVER BASIN Reservoir Storage (1000 AF) - End of April | Watershed Snowpack Analysis - May 1, 1999 ================================================================================================================================== 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 37.8 28.7 23.9 | GREEN above Warren Bridge 4 121 114 | EDEN 11.8 8.5 5.2 5.9 | UPPER GREEN (West Side) 7 150 128 | FLAMING GORGE 3749.0 3140.3 3190.6 --- | NEWFORK RIVER 2 153 126 | FONTENELLE 344.8 134.1 131.6 161.8 | BIG SANDY/EDEN VALLEY 2 145 124 | | GREEN above Fontenelle 13 143 125 | ================================================================================================================================== * 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.