Chief Joseph Dam and Rufus Woods Lake

Project Description

• Sub-basin: Middle Columbia
• Stream: Columbia River
• Location: Bridgeport, Washington
• Owner: Corps of Engineers, Seattle District
• Type of Project: Run-of-river
• Authorized Purpose: Power
• Other Uses: Irrigation, Recreation, Water Quality

Hydrologic Data

• Drainage area = 75,000 sq mi
• Maximum historical peak discharge = 725,000 cfs (1894)
• Maximum rate of change = No limit
• Lake Elevation (NGVD29)
  Maximum pool = 958.8 ft
  Full pool = 956.0 ft
  Minimum pool = 930.0 ft
• Reservoir gross capacity (Elev. 946.0) = 518,000 AF

Powerhouse

• Number of main units = 27
• Nameplate capacity = 2,069 MW
• Overload capacity = 2,614 MW
• Station service units = 6 MW
• Hydraulic capacity = 219,000 cfs

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