Overview
Big Sandy Dam is on Big Sandy Creek 10 miles north of Farson, Wyoming. It is a zoned earthfill dam 85 feet high, having a crest length of 2,350 feet and containing about 840,000 cubic yards of material. The uncontrolled open side-channel spillway has a capacity of 7,350 cubic feet per second.
The outlet works, consisting of a concrete conduit through the base of the dam controlled by two high-pressure slide gates, has a capacity of 620 cubic feet per second. An earthfill dike with a maximum height of 18 feet, 8,300 feet long, and containing 107,000 cubic yards of material lies north of the left abutment of the dam along the eastern rim of the reservoir basin.
General
| Project | Eden |
| Longitude | -109.42863464355469 |
| Watercourse | Big Sandy Creek |
| Reservoir | Big Sandy |
| Original Construction | 1941-1952 |
| National ID Number | WY01387 |
| Latitude | 42.249232907097614 |
Dimensions
| Structural Height | 85.0 ft |
| Crest Length | 2350.0 ft |
| Top of Active Conservation Pool (Elevation) | 6757.5 ft |
| Volume of Dam Construction Materials | 840,000 cu. yards |
| Spillway Crest Elevation | 6757.5 ft |
| Top of Dead Storage Pool (Elevation) | 6720.0 ft |
| Streambed at Dam Axis | 6700.0 ft |
| Crest Elevation | 6769.0 ft |
| Hydraulic Height (Normal Operating Depth at Dam) | 62.8 ft |
Hydraulics & Hydrology
| Spillway Capacity at Elevation | 7350 cfs at 6762.8 ft |
| Auxiliary Spillway | No |
| Outlet Works Capacity at Elevation | 635 cfs at 6762.8 ft |
| Drainage Area | 399.0 sq mi |
| Hydrometeorological Report (HMR) | HMR 49 |
| Maximum Water Surface Elevation | 6762.8 ft |
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