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
Owner
Title: Area Manager Organization: Wyoming Area Office Address: P.O. Box 1630 City: Mills, WY 82644 Phone: 307-261-5671
Operator
Organization: Pathfinder Irrigation District Address: PO Box 338 City: Mitchell, NE 69357 Phone: 308-623-1022
More Information about the U.S. Bureau of Reclamation