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Wilbur A. Dexheimer, Commissioner
Grant Bloodgood, Assistant Commissioner and Chief Engineer

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En gin- Library

ENDERS DAM "\ C Missouri River Basin Project

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General Information
Purpose: Irrigation water, flood control, sediment retention, recreational facilities,

fish and wildlife preservation, and stream pollution abatement.
Location: On Frenchman Creek, a tributary of the Republican River, approximately

50 miles west of McCook, in Chase County, Nebraska.
Constructed: 1947-1951.
Water supply: Frenchman Creek.
Maximum flood: 9,000 second-feet (1940).

Reservoir
Area: 2-, 557 acres.
Controlled storage: 80,730 acre-feet.
Irrigation storage: 36,013 acre-feet.
Dead storage: 8,467 acre-feet. -e^eie-jr-.-

Flood storage: 30,040 acre-feet. (" t

Surcharge: 6,210 acre-feet.

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Dam
Type: Rolled earthfill and rockfill.
Foundation: Ogallala formation.
Slope protection: Riprap on gravel blanket on upstream face, rockfill on downstream

face.
Dimensions:
Height: 103 feet above streambed, 146 feet above excavation.
Crest length: 2,603 feet.
Crest elevation: 3137.5.
Volume: 1,600,000 cubic yards.
Slopes:
Upstream, 4 to 1 to 23.7-foot berm at elevation 3070, 3 to 1 to elevation 3115, and

2-1/2 to 1 to 30 foot crest at elevation 3137.5.
Downstream, 4 to 1 to 10-foot berm at elevation 3066.5, 2-1/2 to 1 to 10-foot berm
at elevation 3091.5, 2-1/2 to 1 to 10-foot berm at elevation 3117, and 2 to 1 to
crest.
Cutoff trench: 30-foot bottom width with 1-1/2 to 1 side slopes.
Greatest depth of excavation: 43 feet.

Dike
Type: Rolled earthfill and rockfill.
Foundation: Loess.
Slope protection: Riprap on upstream face from station 99+39 to station 142+50,

selected material on upstream face from station 142+50 to station
160+72, seeded topsoil on downstream face.
Dimensions:
Height: 26 feet above foundation.
Crest length: 6,133 feet.
Crest elevation: 3135.5.
Volume: 150,000 cubic yards.
Slopes:
Upstream, 3 to 1 from station 99+39 to station 142+50 and 8 to 1 from station

142+50 to station 160+72.
Downstream, 2 to 1.

Spillway and Outlet Works
Type of spillway: Gated concrete overflow-chute type with stilling basin.
Crest elevations: Spillway, 3097.0; outlet works, 3080.0.
Maximum discharge:

Spillway, 200,000 second-feet.

Outlet works, 1,448 second-feet.
Outlet conduit: 7 feet in diameter, 512 feet long.
Spillway gates: Six gates 50 by 30 feet in size.
Stilling basins:

Spillway, reinforced concrete with chute blocks and dentated end sills.

Outlet works, reinforced concrete with deflector wall.
Concrete: 45,627 cubic yards.
Reinforcing steel: 4,500,000 pounds.

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