Reservoir Levels Weather Hydrology

Big Sandy Reservoir is a man-made reservoir located in Sweetwater County, Wyoming. The reservoir was built in 1963 as part of the Seedskadee Project, which was a joint effort by the Bureau of Reclamation and the state of Wyoming to provide irrigation water to the Green River Valley. The reservoir covers an area of 2,500 acres and has a storage capacity of 40,000 acre-feet. The hydrology of the reservoir is primarily dependent on snowmelt and surface water from the Big Sandy River and Bull Lake Creek. The reservoir is used for agricultural irrigation, recreation, and wildlife habitat. It is a popular destination for camping, fishing, and boating, and is home to a variety of fish species including rainbow trout, brown trout, and kokanee salmon.

June 14, 2024







Storage 24hr Change -0.05%
Percent of Normal 164%
Minimum 81 acre-ft
Maximum 51,962.71 acre-ft
Average 31,388 acre-ft
Nid_Height 85
Hydraulic_Height 69
Drainage_Area 439
Year_Completed 1951
Dam_Height 85
Structural_Height 85
Primary_Dam_Type Earth
Foundations Rock, Soil
Surface_Area 2510
Hazard_Potential High
Outlet_Gates Valve - 2
Nid_Storage 54400
Dam_Length 2350

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