Overview
The bedrock in the sediments of Kirwin Dam is the Fort Hays limestone of the Niobrara foundation. The Fort Hays overlies the Carlile shale, which forms the bedrock under valley section of the Dam. Both of these formations are of Cretaceous Age. The overburden in the area consists of reworked chalk covered with a thin layer of silt and sand (loess). Numerous areas of lithologic color change indicating that the chalk is near the surface substantiate the thinness of the silt-sand layer. Several seismic spreads were shot in such areas to verify this interpretation. An example of chalk is revealed by a group of light colored patches about 700 feet south of the channel on the right abutment.
General
| Project | PSMBP-Kirwin |
| Longitude | -99.1222 |
| Latitude | 39.6500 |
| Watercourse | NF Solomon Rivr |
| Reservoir | Kirwin |
| Original Construction | 1952-1955 |
| National ID Number | KS00022 |
Dimensions
| Crest Elevation | 1779.0 ft |
| Structural Height | 169.0 ft |
| Hydraulic Height (Normal Operating Depth at Dam) | 97.3 ft |
| Crest Length | 960.0 ft |
| Top of Active Conservation Pool (Elevation) | 1729.3 ft |
| Top of Dead Storage Pool (Elevation) | 1693.00 ft |
| Streambed at Dam Axis | 1662.3 ft |
| Top of Inactive Conservation Pool (Elevation) | 1697.0 ft |
| Spillway Crest Elevation | 1757.3 ft |
Hydraulics & Hydrology
| Normal Water Surface Elevation | 1729.25 ft |
| Auxiliary Spillway | No |
| Outlet Works Capacity at Elevation | 275.0 cfs at 1701.0 ft |
| Drainage Area | 1370.0 sq mi |
| Hydrometeorological Report (HMR) | HMR 51 & 52 |
| Spillway Capacity at Elevation | 96000.0 cfs at 1773.0 ft |
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