US Army Corps of Engineers

Bonneville Dam and Lake


Provisional Data Warning
Hydrologic Data: [Hourly] [8 Days Hourly] [Daily] [Prior Month] [Graph] [Query]
Water Quality Data: [High 12-hour Avg TDG] [Total Spill] [TDG graphs] [TDG csv] [Spillbays] [Forebay]
Power: [Monthly Power Report]

Bonneville Dam 2 Bonneville Dam 1 Bonneville Dam 3

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

7 Day Project Status

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U.S. Army Corps of Engineers, Columbia Basin Water Management Division
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