Streamflow
Expected yields vary from 80 to 84 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 740,000-acre feet
(82 percent of average). Blacks Fork near Robertson is forecast to
yield 80,000-acre feet (84 percent of average). East Fork of Smiths
Fork near Robertson is estimated to yield 24,000 acre-feet (80
percent of average). The estimated yield for Hams Fork near Frontier
is 55,000-acre feet (83 percent of average). Viva Naughton Reservoir
inflow will be about 72,000-acre feet (81 percent of average).
Flaming Gorge Reservoir inflow will be about 1,000,000-acre feet (84
percent of average).
================================================================================================================================== LOWER GREEN RIVER BASIN Streamflow Forecasts - March 1, 2000 ================================================================================================================================== | <<====== 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 504 645 | 740 82 | 835 976 899 | | Blacks Fork nr Robertson APR-JUL 52 69 | 80 84 | 91 108 95 | | EF of Smiths Fork nr Robertson APR-JUL 18.2 22 | 24 80 | 27 32 30 | | Hams Fk blw Pole Ck nr Frontier APR-JUL 36 47 | 55 83 | 64 78 66 | | Hams Fk Inflow to Viva Naughton Res APR-JUL 40 59 | 72 81 | 85 104 89 | | Flaming Gorge Reservoir Inflow APR-JUL 673 868 | 1000 84 | 1133 1328 1196 | | ================================================================================================================================== LOWER GREEN RIVER BASIN | LOWER GREEN RIVER BASIN Reservoir Storage (1000 AF) - End of February | Watershed Snowpack Analysis - March 1, 2000 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= FONTENELLE 344.8 130.8 144.8 172.0 | HAMS FORK RIVER 4 80 88 | FLAMING GORGE 3749.0 3208.0 3265.3 --- | BLACKS FORK 5 96 111 | VIVA NAUGHTON RES 42.4 34.5 30.6 27.8 | HENRYS FORK 3 75 82 | | GREEN above Flaming Gorge 26 81 92 | ================================================================================================================================== * 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.