Minatare Dam

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.

RegionFacilities in Great Plains | Great Plains Home Page
CountyScotts Bluff
ProjectNorth Platte
Dam Type
ReservoirLake Minatare
WatercourseMinatare Supply Canal
Original Construction1912-1915
Modified Construction
National ID NumberNE01075
Hydrologic Unit Code

Structural Height114.0 ft
Hydraulic Height (Normal Operating Depth at Dam)48.0 ft
Top Parapet (Elevation)
Spillway Crest Elevation4125.0 ft
Crest Elevation4140.0 ft
Crest Length3760.0 ft
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis4077.0 ft
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)4125.0 ft
Top of Inactive Conservation Pool (Elevation)4074.0 ft
Top of Dead Storage Pool (Elevation)4075.0 ft

Hydraulics & Hydrology
Total Water Storage at Elevation
Maximum Water Surface Elevation
Normal Water Surface Elevation4125.0 ft
Spillway Type
Auxiliary SpillwayNo
Spillway Capacity at Elevation1020.0 cfs at 4127.2 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation880.0 cfs at 4127.0 ft
Diversion Capacity at Elevation
Drainage Area
Hydrometeorological Report (HMR)
Probable Maximum Flood (PMF) Report

Contact Information
TitleArea Manager
OrganizationWyoming Area Office
AddressP.O. Box 1630
CityMills, WY 82644
Phone (Office)307 261-5671
OrganizationPathfinder Irrigation District
AddressPO Box 338
CityMitchell, NE 69357
Phone (Office)308 623-1022

Last updated: Apr 02, 2013