Grand Coulee Dam and Lake

Project Description

• Sub-basin: Upper Columbia
• Stream: Columbia River
• Location: Grand Coulee, Washington
• Owner: U.S. Bureau of Reclamation
• Type of Project: Storage
• Authorized Purpose: Power, Flood Control, Irrigation
• Other Uses: Recreation, Fish and Wildlife

Hydrologic Data

• Drainage area = 74,700 sq mi
• Maximum historical peak discharge = 637,800 cfs (1948)
• Lake Elevation
  Normal full pool = 1,290.0 ft
  Normal minimum pool = 1,208.0 ft
• Usable Storage (1,208.0 to 1,290.0) = 5,185,500 AF

Powerhouse

• Number of main units = 24
• Nameplate capacity = 6,494.0 MW
  Station service units = 30.0 MW
  Pump/Generator units = 314.0 MW
• Overload capacity = 7,416.0 MW
  Station service units = 30.0 MW
  Pump/Generator units = 314.0 MW
• Hydraulic capacity = 280,000 cfs

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