Statistics (Cubic Feet per Second = CFS; Mean Sea Level = MSL; Kilowatts = Kw; Revolutions per Minute = RPM)
Significant Dates:
- Operating Since: 1953
- Construction Start: 1946
- Closure: July 20, 1952
- Reservoir filling initiated: January 1953
- Reservoir first reached minimum operating pool: November 24, 1953
- Initial Power Generation – First and Last Units: March 1954 – January 1956
Powerplant
- Number of turbines: 8 Francis, 85.7 rpm
- Max power generation capability: 320,000 Kw
Size
- Ranking: 11th largest reservoir in the United States
- Length of Dam: 10,700 feet (including spillway)
- Damming Height: 140 feet (low water to maximum operating pool)
- Maximum Height: 165 feet
- Maximum width at base: 4,300 feet (total)
- Maximum width at base: 1,250 feet (without berms)
- Elevation at crest: 1,375 feet msl
Construction
- Abutment formations (under dam & embankment): Niobrara chalk
- Type of Fill: Rolled-earth fill & chalk berms
- Amount of Fill: 28,000,000 cubic yards of fill & 22,000,000 cubic yards of fill
- Amount of Concrete: 961,000 cubic yards
Spillway
- Location: Left bank - adjacent
- Width: 1,000 feet gated
- Number of gates: 21
- Dimension of gates: 40-foot x 29-foot tainter gates
- Design discharge capacity: 620,000 cfs at 1,379.3 feet msl pool elevation
- Discharge capacity at maximum operating pool: 508,000 cfs at 1,375 feet msl
- Top of Spillway Gates (closed): 1,375 feet msl
Intake structures
Outlet works
- Number:
- Size:
- Length:
- Release capacity:
Lake
- Upstream Drainage: 14,150 square miles
- Tributaries: Missouri River, White River
- Shoreline length: 540 miles at 1,350 feet msl
- Length of full reservoir: 107 miles
- Surface acres: 102,000 acres
- Storage capacity: 5,418,000 acre-feet
- Maximum depth: 140 feet
- Annual Flood Ctrl & Multi-Use Zone (Elevation): 1,350 feet msl – 1,365 feet msl
- Exclusive Flood Ctrl Zone (Elevation): 1,365 feet msl – 1,375 feet msl
- Record Pool Elevation (Date): 1,372.2 feet msl (1997); 1,374.0 feet msl (July 11, 2011)
- Record Flow Prior to 2011 (Year): 67,000 cfs (1997)
- Record Flow (2011): 160,000 cfs (Late July)