Precipitation
Reservoir
Streamflow
Expected yields vary from 83 to 105 percent of average across the
basin. The following forecast values are based on a 50 percent chance
probability for the April through July forecast period. Green River
near Green River is forecast to yield about 930,000-acre feet (103
percent of average). Blacks Fork near Robertson is forecast to yield
83,000 acre-feet (87 percent of average). East Fork of Smiths Fork
near Robertson is estimated to yield 25,000 acre-feet (83 percent of
average). The estimated yield for Hams Fork near Frontier is 63,000-
acre feet (96 percent of average). Viva Naughton Reservoir inflow
will be about 80,000-acre feet (90 percent of average). Flaming Gorge
Reservoir inflow is expected to yield 1,250,000 acre-feet (105 percent
of average).
================================================================================================================================== LOWER 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 nr Green River, WY APR-JUL 764 843 | 930 103 | 1017 1097 899 | | Blacks Fork nr Robertson APR-JUL 60 74 | 83 87 | 92 106 95 | | EF of Smiths Fork nr Robertson APR-JUL 19.8 23 | 25 83 | 28 32 30 | | Hams Fk blw Pole Ck nr Frontier APR-JUL 45 56 | 63 96 | 71 84 66 | | Hams Fk Inflow to Viva Naughton Res APR-JUL 54 69 | 80 90 | 91 106 89 | | Flaming Gorge Reservoir Inflow APR-JUL 909 1128 | 1250 105 | 1372 1591 1196 | | ================================================================================================================================== LOWER GREEN RIVER BASIN | LOWER 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 ========================================================================|========================================================= FONTENELLE 344.8 122.9 115.6 157.9 | HAMS FORK RIVER 4 117 101 | FLAMING GORGE 3749.0 3190.6 3235.0 --- | BLACKS FORK 5 83 89 | VIVA NAUGHTON RES NO REPORT | HENRYS FORK 3 58 78 | | GREEN above Flaming Gorge 26 110 101 | ================================================================================================================================== * 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.