Overview
The Pierre Shale of Upper Cretaceous Age underlies the dam and reservoir area at a depth of 175 feet below the valley floor. The Ogallala Formation of Pliocene Age unconformably overlies the Pierre Shale. The Ogallala Formation is composed of fine to course sand, some gravel, calcareous silt, silty sands, silts and clays. Various degrees of calcareous cementation occur, resulting in lenses of varying loose unconsolidated to very firm compact materials at irregular intervals. The Ogallala beds lie almost horizontal and structural irregularities, such as faulting, have been observed in the area. The overburden consists of alluvial materials on the valley floor and of reworked loess and slope wash materials on the valley sides. The alluvial materials are a mixture of fine sand and small pea gravel with a high percentage of chalk particles. The reworked loess ranges from sandy to clayey loam of low to moderate density. The slope wash is a mixture of loess and Ogallala talus resulting from colluvial action.
General
Project | PSMBP-Frenchman-Cambridge |
Location | 1.5 mi from Enders |
Longitude | -101.5175 |
Latitude | 40.4208 |
Watercourse | Frenchman River |
Reservoir | Enders |
Original Construction | 1947-1951 |
National ID Number | NE01070 |
Dimensions
Crest Elevation | 3137.5 ft |
Structural Height | 134.0 ft |
Hydraulic Height (Normal Operating Depth at Dam) | 93.0 ft |
Crest Length | 2603.0 ft |
Top of Active Conservation Pool (Elevation) | 3112.3 ft |
Spillway Crest Elevation | 3097.0 ft |
Streambed at Dam Axis | 3042.0 ft |
Top of Inactive Conservation Pool (Elevation) | 3082.4 ft |
Top of Dead Storage Pool (Elevation) | 3080.0 ft |
Hydraulics & Hydrology
Spillway Capacity at Elevation | 200000 cfs at 3129.0 ft |
Outlet Works Capacity at Elevation | 1431 cfs at 3129.0 ft |
Hydrometeorological Report (HMR) | HMR 51 & 52 |
Normal Water Surface Elevation | 3112.3 ft |
Auxiliary Spillway | No |
Drainage Area | 1097 sq mi |
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