John Day Dam and Lake Umatilla

Project Description

• Sub-basin: Lower Columbia
• Stream: Columbia River
• Location: Rufus, Oregon
• Owner: Corps of Engineers, Portland District: John Day
• Type of Project: Storage
• Authorized Purpose: Flood Control, Power, Navigation
• Other Uses: Fishery, Recreation, Irrigation, Water Quality

Hydrologic Data

• Drainage area = 226,000 sq mi
• Maximum historical peak discharge = 1,240,000 cfs (1894)
• Maximum change per hour = 200,000 cfs
• Lake Elevation
       Maximum pool = 276.5 ft
       Full pool = 268.0 ft
       Minimum pool = 257.0 ft
• Usable Storage (257.0 to 268.0) = 534,000 AF

Powerhouse

• Number of units......................................16
• Nameplate capacity............................2,160 MW
• Overload capacity..............................2,485 MW
• Hydraulic capacity.................................322,000 cfs