Skip Navigation
Decrease Normal Increase

Statistics


Cushman Dam No. 1

Cushman No. 1 Dam

  • Year completed - 1926
  • River system - North Fork, Skokomish River 
  • Original investment - $4.36 million
  • Type of dam - concrete arch/gravity and embankment
  • Height - above riverbed, 235 feet; above bedrock, 275 feet
  • Length - 1,111 feet
  • Width - top, 8 feet; base, 50 feet
  • Volume of concrete in dam - 90,000 cubic yards
  • Average flow - 845 cubic feet/second
  • Drainage area - 94 square miles
  • Reservoir length - 9.6 miles
  • Miles of shoreline - 23 miles
  • Reservoir area at maximum elevation - 4,010 acres
  • Reservoir elevation - full, 738 feet; lowest allowable, 615 feet
  • Average annual generation - 127 million kilowatt-hours
  • Equivalent number of NW homes served - 9,000
  • Number of generators - two 21,600 kilowatt generators
  • Installed capacity (nameplate rating) - 43,200 kilowatts

 


Lake Kokanee and Cushman Dam No. 2

Cushman No. 2 Dam

  • Year completed - 1930
  • River system - North Fork, Skokomish River
  • Original investment - $8.23 million
  • Type of dam - concrete arch/gravity
  • Height - above riverbed, 175 feet; above bedrock, 235 feet
  • Length - 575 feet
  • Width - top, 8 feet; base, 40 feet
  • Volume of concrete in dam - 38,000 cubic yards
  • Average flow - 852 cubic feet/second
  • Drainage area - 100 square miles
  • Reservoir length - 2 miles
  • Miles of shoreline - 4.5 miles
  • Reservoir area at maximum elevation - 150 acres
  • Reservoir elevation - full, 480 feet; lowest allowable, 460 feet
  • Average annual generation - 233 million kilowatt-hours
  • Equivalent number of NW homes served - 16,500
  • Number of generators - three 27,000 kilowatt generators 
  • Installed capacity (nameplate rating) - 81,000 kilowatts