US Army Corps of Engineers

McNary Dam and Lake Wallula

Provisional Data Warning
Hydrologic Data: [Hourly] [8 Days Hourly] [Daily] [Prior Month] [Graph] [Query]
Water Quality Data: [High 12-hour Avg TDG] [% Spill] [Total Spill] [TDG graphs] [TDG csv] [Temperature String] [Spillbays] [WA Forebay] [Tailwater]
Power: [Monthly Power Report]
McNary Dam 2 McNary Dam 1

Project Description

  • Sub-basin: Lower Columbia
  • Stream: Columbia River
  • Location: Umatilla, Oregon
  • Owner: Corps of Engineers, Walla Walla District.
  • Type of Project: Run-of-river
  • Authorized Purpose: Power, Navigation
  • Other Uses: Fishery, Recreation, Irrigation, Water Quality

Hydrologic Data

  • Drainage area = 214,000 sq mi
  • Maximum historical peak discharge:
    Unregulated = 1,240,000 cfs (1894)
    Regulated = 668,000 cfs (1894)
  • Maximum rate of change per hour = 150,000 cfs
  • Lake Elevation (NGVD29)
    Maximum pool = 357.0 ft
    Normal full pool = 340.0 ft
    Minimum pool = 335.0 ft

Powerhouse

  • Number of units = 14
  • Nameplate capacity = 980 MW
  • Overload capacity = 1,127 MW
  • Hydraulic capacity = 232,000 cfs

7 Day Project Status

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