Enders Dam

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.

RegionFacilities in Great Plains | Great Plains Home Page
Dam Type
WatercourseFrenchman River
Location1.5 mi from Enders
Original Construction1947-1951
Modified Construction
National ID NumberNE01070
Hydrologic Unit Code

Structural Height134.0 ft
Hydraulic Height (Normal Operating Depth at Dam)93.0 ft
Top Parapet (Elevation)
Spillway Crest Elevation3097.0 ft
Crest Elevation3137.5 ft
Crest Length2603.0 ft
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis3042.0 ft
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)3112.3 ft
Top of Inactive Conservation Pool (Elevation)3082.4 ft
Top of Dead Storage Pool (Elevation)3080.0 ft

Hydraulics & Hydrology
Total Water Storage at Elevation
Maximum Water Surface Elevation
Normal Water Surface Elevation3112.3 ft
Spillway Type
Auxiliary SpillwayNo
Spillway Capacity at Elevation200000 cfs at 3129.0 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation1431 cfs at 3129.0 ft
Diversion Capacity at Elevation
Drainage Area1097 sq mi
Hydrometeorological Report (HMR)HMR 51 & 52
Probable Maximum Flood (PMF) Report

Contact Information
TitleArea Office Manager
OrganizationNebraska-Kansas Area Office
Address1706 West Third
CityMcCook, NE 69001
Phone (Office)308-345-4400
Phone (Fax)308-345-6470
TitleArea Office Manager
OrganizationNebraska-Kansas Area Office
Address1706 West Third
CityMcCook, NE 69001
Phone (Office)308-345-4400
Phone (Fax)308-345-6470

Last updated: Mar 29, 2013