Overview
Lake Minatare Reservoir is within the High Plains physiographic province, near the northern edge of a terrace of the North Platte River. A veneer of wind- and water-intermixed and interlayed sand, silt and some gravel, cover the terrace. Their surficial materials are noncohesive and have little resistance to erosion by wind or water. The terrace is underlain by the Brule Formation, a Tertiary siltstone to sandy siltstone of continental origin, which forms the foundation for Minatare Dam and Reservoir. The Brule is a soft but well-compacted tan to yellowish-brown sedimentary rock. The sand content is reported to gradually increase from the base toward the upper contact of the formation. The Brule is weakly calccareously cemented and tends to break down when exposed.
General
| Project | North Platte |
| Longitude | -103.4925 |
| Latitude | 41.9183 |
| Watercourse | Minatare Supply Canal |
| Reservoir | Lake Minatare |
| Original Construction | 1912-1915 |
| National ID Number | NE01075 |
Dimensions
| Crest Elevation | 4140.0 ft |
| Structural Height | 114.0 ft |
| Hydraulic Height (Normal Operating Depth at Dam) | 48.0 ft |
| Crest Length | 3760.0 ft |
| Top of Active Conservation Pool (Elevation) | 4125.0 ft |
| Top of Inactive Conservation Pool (Elevation) | 4074.0 ft |
| Spillway Crest Elevation | 4125.0 ft |
| Top of Dead Storage Pool (Elevation) | 4075.0 ft |
| Streambed at Dam Axis | 4077.0 ft |
Hydraulics & Hydrology
| Normal Water Surface Elevation | 4125.0 ft |
| Spillway Capacity at Elevation | 1020.0 cfs at 4127.2 ft |
| Outlet Works Capacity at Elevation | 880.0 cfs at 4127.0 ft |
| Auxiliary Spillway | No |
Contact
