OverviewDetails
Overview
Upper Stillwater Dam is a roller compacted concrete gravity dam located on Rock Creek, about 31 miles northwest of Duchesne, Utah.
Geology
Foundation: The foundation consists of Pre-Cambrian sandstone and argillites with nearly horizontal bedding planes. Most of the length of the dam bears on hard sandstone. Near each abutment the dam bears on argillite, which overlies the sandstone.
General
| Project | CUP-Bonneville Unit |
| Dam Type | Roller compacted concrete |
| Longitude | -110.6992 |
| Latitude | 40.5600 |
| Watercourse | Rock Creek |
| Reservoir | Upper Stillwater |
| Original Construction | 1983-1987 |
| Base Width | 177 ft |
Dimensions
| Crest Elevation | 8180.0 |
| Structural Height | 310 ft |
| Hydraulic Height (Normal Operating Depth at Dam) | 188.5 ft |
| Crest Width | 29 ft |
| Top of Inactive Conservation Pool (Elevation) | 8028.4 ft |
| Top of Dead Storage Pool (Elevation) | 8010.0 ft |
| Streambed at Dam Axis | 7987.0 ft |
| Crest Length | 2660 ft |
| Top of Active Conservation Pool (Elevation) | 8272.0 ft |
| Volume of Dam Construction Materials | 1,490.000 cu yds |
Hydraulics & Hydrology
| Spillway Capacity at Elevation | 7820 cfs at 8175.5 |
| Outlet Works Capacity at Elevation | 820 cfs at 8172 ft |
| Drainage Area | 102 sq mi |
| Maximum Water Surface Elevation | 8175.5 ft |
| Hydrometeorological Report (HMR) | HMR 49 |
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