Precipitation
Reservoir
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 275,000 acre-feet (103 percent of normal). Pine Creek above
Fremont Lake is expected to yield 105,000 acre-feet (101 percent of normal).
New Fork River near Big Piney is expected to yield about 400,000 acre-feet
(104 percent of normal). Inflow to Fontenelle Reservoir is expected to be
about 900,000 acre feet (106 percent of average). Big Sandy near Farson is
expected to be about 63,000 acre-feet (111 percent of normal).
================================================================================================================================== UPPER GREEN RIVER BASIN Streamflow Forecasts - April 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 229 258 | 275 103 | 292 319 266 | | Pine Creek abv Fremont Lake APR-JUL 89 99 | 105 101 | 111 121 104 | | New Fork River nr Big Piney APR-JUL 285 357 | 400 104 | 443 516 385 | | Fontenelle Reservoir Inflow APR-JUL 654 830 | 900 106 | 972 1146 849 | | Big Sandy River nr Farson APR-JUL 47 56 | 63 111 | 70 79 57 | | ================================================================================================================================== UPPER GREEN RIVER BASIN | UPPER GREEN RIVER BASIN Reservoir Storage (1000 AF) - End of March | Watershed Snowpack Analysis - April 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 24.7 19.9 | GREEN above Warren Bridge 4 110 103 | EDEN 11.8 7.1 3.5 4.7 | UPPER GREEN (West Side) 7 127 105 | FLAMING GORGE 3749.0 3190.6 3235.0 --- | NEWFORK RIVER 3 126 107 | FONTENELLE 344.8 122.9 115.6 157.9 | BIG SANDY/EDEN VALLEY 2 156 114 | | GREEN above Fontenelle 14 123 105 | ================================================================================================================================== * 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. (D) - The operational measurement of flow at this point has been discountinued.