Statistics (Cubic Feet per Second = CFS; Mean Sea Level = MSL; Kilowatts = Kw; Revolutions per Minute = RPM)
Significant Dates:
- Operating Since: 1955
- Construction Start: 1952
- Closure: July 31, 1955
- Reservoir filling initiated: August 1955
- Reservoir first reached minimum operating pool: December 22, 1955
- Initial Power Generation – First and Last Units: September 1956 – January 1957
Powerplant
- Number of turbines: 3 Kaplan, 75 rpm
- Max power generation capability: 132,300 Kw
Size
- Ranking:
- Length of Dam: 8,700 feet (including spillway)
- Damming Height: 45 feet (low water to maximum operating pool)
- Maximum Height: 74 feet
- Maximum width at base: 850 feet (total)
- Maximum width at base: 450 feet (without berms)
- Elevation at crest: 1,234 feet msl
Construction
- Abutment formations (under dam & embankment): Niobrara chalk & Carlisle shale
- Type of Fill: Rolled-earth & chalk fill
- Amount of Fill: 7,000,000 cubic yards of fill
- Amount of Concrete: 308,000 cubic yards
Spillway
- Location: Right bank - adjacent
- Width: 1,180 feet gated
- Number of gates: 14
- Dimension of gates: 40-foot x 30-foot tainter gates
- Design discharge capacity: 584,000 cfs at 1,221.4 feet msl pool elevation
- Discharge capacity at maximum operating pool: 345,000 cfs at 1,210 feet msl
- Top of Spillway Gates (closed): 1,210 feet msl
- Intake structures Direct intake, no Surge Tanks
- Outlet works River regulation is attained by flow over low-crested spillway and through turbines
Lake
- Upstream Drainage: 16,000 square miles
- Tributaries: Missouri River
- Shoreline length: 90 miles at 1,204.5 feet msl
- Length of full reservoir: 25 miles
- Surface acres: 31,000 acres
- Storage capacity: 450,000 acre-feet
- Maximum depth: 45 feet
- Annual Flood Ctrl & Multi-Use Zone (Elevation): 1,204.5 feet msl – 1,208 feet msl
- Exclusive Flood Ctrl Zone (Elevation): 1,208 feet msl – 1,210 feet msl
- Record Pool Elevation (Date): 1,209.7 feet msl (2010)
- Record Flow Prior to 2011 (Year): 70,000 cfs (1997)
- Record Flow (2011): 160,200 cfs (Early July)