Grand Coulee Dam and Lake


Provisional Data Warning
Hydrologic Data: [Hourly] [8 Days Hourly] [Daily] [Prior Month] [Query]
Water Quality Data: [Total Spill] [TDG csv] [Forebay] [Tailwater]
Water Year Summaries: [Forebay] [Storage] [Inflow] [Outflow]
Power: [Monthly Power Report]

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

7 Day Project Status

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