Lower Granite Dam and Lake

Project Description

• Stream: Snake River
• Location: Almota, Washington
• Type of Project: Run-of-river
• Authorized Purpose: Power, Navigation
• Other Uses: Fishery, Recreation, Irrigation, Water Quality

Hydrologic Data

• Drainage area = 103,200 sq mi
• Maximum historical peak discharge:
       Unregulated = 409,000 cfs (1894)
       Regulated = 295,000 cfs (1894)
• Forebay Elevation
       Maximum pool = 746.5 ft
       Normal full pool = 738.0 ft
       Normal minimum pool = 733.0 ft
• Maximum rate of change per hour = 70,000 cfs

Powerhouse

• Number of units..........................6
• Nameplate capacity....................810 MW
• Overload capacity......................932 MW
• Hydraulic capacity.....................130,000 cfs