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Statistics (Cubic Feet per Second = CFS; Mean Sea Level = MSL; Kilowatts = Kw; Revolutions per Minute = RPM)

Significant Dates:

  • Operating Since: 1964
  • Construction Start: 1959
  • Closure: July 24, 1963
  • Reservoir filling initiated: November 1963
  • Reservoir first reached minimum operating pool: March 25, 1964
  • Initial Power Generation – First and Last Units: October 1964 – July 1966
Powerplant
  • Number of turbines: 8 Fixed blade, 81.8 rpm
  • Max power generation capability: 494,320 Kw

Size

  • Ranking: 54th largest reservoir in the United States
  • Length of Dam: 10,570 feet (including spillway)
  • Damming Height: 78 feet (low water to maximum operating pool)
  • Maximum Height: 95 feet
  • Maximum width at base: 1,200 feet (total)
  • Maximum width at base: 700 feet (without berms)
  • Elevation at crest: 1,423 feet msl

Construction

  • Abutment formations (under dam & embankment): Pierre shale & Niobrara chalk
  • Type of Fill: Rolled-earth shale fill & chalk fill
  • Amount of Fill: 17,000,000 cubic yards of fill
  • Amount of Concrete: 540,000 cubic yards

Spillway

  • Location: Left bank - adjacent
  • Width: 376 feet gated
  • Number of gates: 8
  • Dimension of gates: 40-foot x 38-foot tainter gates
  • Design discharge capacity: 390,000 cfs at 1,433.6 feet msl pool elevation
  • Discharge capacity at maximum operating pool: 270,000 cfs at 1,423 feet msl
  • Top of Spillway Gates (closed): 1,423 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: 5,840 square miles
  • Tributaries: Missouri River
  • Shoreline length: 200 miles at 1,420 feet msl
  • Length of full reservoir: 80 miles
  • Surface acres: 56,884 acres
  • Storage capacity: 1,798,000 acre-feet
  • Maximum depth: 78 feet
  • Annual Flood Ctrl & Multi-Use Zone (Elevation): 1,420 feet msl – 1,422 feet msl
  • Exclusive Flood Ctrl Zone (Elevation): 1,422 feet msl – 1,423 feet msl
  • Record Pool Elevation (Date): 1,422.1 feet msl (1991)
  • Record Flow Prior to 2011 (Year): 74,000 cfs (1997)
  • Record Flow (2011): 166,300 cfs (Mid June)