Streamflow
The following is based on the 50 percent chance stream flow yields are for the April through September period. Smiths
Fork near Border is estimated to yield 91,000 acre-feet (77 percent of normal), and Thomas Fork drainage near the
Idaho-Wyoming state line is much below average. Bear River above the Utah-Wyoming State Line is expected to yield
about 100,000 acre feet ( 80 percent of average), The Bear River near Woodruff is expected to yield about 118,000
acre-feet (about 77 percent of normal).
================================================================================================================================== UPPER BEAR RIVER BASIN Streamflow Forecasts - February 1, 2002 ================================================================================================================================== | <<====== 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) ====================================================================|=======================|===================================== SMITHS FK nr Border, WY APR-SEP 62 78 | 91 77 | 107 134 118 | | Bear R nr UT-WY State Line APR-SEP 72 88 | 100 80 | 114 139 125 | | BEAR R nr Woodruff, UT APR-SEP 63 92 | 118 77 | 152 220 154 | | ================================================================================================================================== UPPER BEAR RIVER BASIN | UPPER BEAR RIVER BASIN Reservoir Storage (1000 AF) - End of January | Watershed Snowpack Analysis - February 1, 2002 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= WOODRUFF NARROWS 57.3 4.0 8.0 25.2 | UPPER BEAR RIVER in Utah 5 116 81 | | SMITHS & THOMAS FORKS 4 135 83 | | BEAR RIVER abv ID line 7 130 83 | | NORTHWEST 76 155 79 | | NORTHEST 21 86 67 | | SOUTHEAST 34 78 61 | | SOUTHWEST 30 112 76 | ================================================================================================================================== * 90%, 70%, 30%, and 10% chances of exceeding are the probabilities that the actual volume will exceed the volumes in the table. (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.