Gavins Point Dam - Omaha District US Army Corps of Engineers

OMAHA DISTRICT

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

  • Significant Dates:
    • Operating Since: 1955
    • Construction Start: 1946
    • Closure: April 15, 1953
    • Reservoir filling initiated: December 1953
    • Reservoir first reached minimum operating pool: August 7, 1955
    • Initial Power Generation – First and Last Units: January 1956 – October 1960
  • Powerplant
    • Number of turbines: 5 Francis, 90 rpm
    • Max power generation capability: 583,300 Kw
  • Size
    • Ranking: 42nd largest reservoir in the world, 3rd largest reservoir in the United States
    • Length of Dam: 11,300 feet (excluding spillway)
    • Damming Height: 180 feet (low water to maximum operating pool)
    • Maximum Height: 210 feet
    • Maximum width at base: 3,400 feet (total)
    • Maximum width at base: 2,050 feet (without berms)
    • Elevation at crest: 1,854 feet msl
  • Construction
    • Abutment formations (under dam & embankment): Fort Union clay shale
    • Type of Fill: Rolled-earth fill
    • Amount of Fill: 66,500,000 cubic yards of fill
    • Amount of Concrete: 1,500,000 cubic yards
  • Spillway
    • Location: Left bank - adjacent
    • Width: 1,336 feet gated
    • Number of gates: 28
    • Dimension of gates: 40-foot x 25-foot tainter gates
    • Design discharge capacity: 827,000 cfs at 1,858.5 feet msl pool elevation
    • Discharge capacity at maximum operating pool: 660,000 cfs at 1,854 feet msl
    • Top of Spillway Gates (closed): 1,854 feet msl
  • Intake structures
    • Number: 1
    • Size: 170 feet wide, 249 feet high
    • Length: 540 feet long
  • Outlet works
    • Number: 5 power generation tunnels, 3 regulating tunnels
    • Size: Tunnels 1-5 24-foot dia., Tunnel 6 26-foot dia., Tunnels 7 & 8 22-foot dia.
    • Length: Approximately 1,465.5 feet
    • Release capacity: Tunnel 6 - 34,400 cfs at elevation 1854 msl, Tunnels 7 & 8 - 29,040 cfs (each) at elevation 1854 msl
  • Lake/Reservoir
    • Upstream Drainage: 123,900 square miles
    • Tributaries: Missouri River, Milk River, Little Missouri River, Yellowstone River
    • Shoreline length: 1,340 miles at 1,837.5 feet msl
    • Length of full reservoir: 178 miles
    • Surface acres: 382,000 acres
    • Storage capacity: 23,821,000 acre-feet
    • Maximum depth: 180 feet
    • Annual Flood Ctrl & Multi-Use Zone (Elevation): 1,837.5 feet msl – 1,850 feet msl
    • Exclusive Flood Ctrl Zone (Elevation): 1,850 feet msl – 1,854 feet msl
    • Record Pool Elevation (Date): 1,854.8 feet msl (1975); 1,854.6 feet msl (July 1, 2011)
    • Record Flow Prior to 2011 (Year): 65,000 cfs (1975)
    • Record Flow (2011): 150,600 cfs (Mid June)