Bonneville Dam and Lake

Project Description

• Sub-basin: Lower Columbia
• Stream: Columbia River
• Location: Bonneville, Oregon
• Owner: Corps of Engineers, Portland District
• Type of Project: Run-of-river
• Authorized Purpose: Power, Navigation
• Other Uses: Fisheries, Recreation, Water Quality

Hydrologic Data

• Drainage area = 240,000 sq mi
• Maximum inflow (unregulated) = 1,240,000 cfs (1894)
• Lake Elevation (NGVD29)
  Maximum forebay = 82.5 ft
  Full forebay = 77.0 ft
  Minimum forebay = 70.0 ft
  

Powerhouse

First powerhouse

• Number of main units = 10
• Nameplate capacity = 518 MW
• Overload capacity = 574 MW
• Station service units = 4 MW
• Hydraulic capacity = 136,000 cfs

Second powerhouse

• Number of main units = 8
• Nameplate capacity = 532 MW
• Overload capacity = 612 MW
• Fishway units capacity = 26.2 MW
• Hydraulic capacity = 152,000 cfs

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