Scoggins Dam and Henry Hagg Lake

Project Description

• Sub-basin: Lower Willamette
• Stream: Scoggins Creek
• Location: Forest Grove, Oregon
• Owner: US Bureau of Reclamation: Hydromet System
• Operator: Tualatin Valley Irrigation District
• Type of Project: Storage
• Authorized Purpose: Irrigation, Flood Control, Municipal and Industrial Water Supply, Recreation, Fish and Wildlife, Water Quality Control
• Other Uses: None

Hydrologic Data

• Drainage area =
      39 sq mi (Above dam site)
      86 sq mi (Uncontrolled area above Dilley)
• Estimated Peak Discharge =
      17,100 cfs Tualatin River at Dilley (1964)
      31,000 cfs Tualatin River at Farmington (1933)
• Reservoir Elevation
       Maximum pool = 305.8 ft
       Full pool = 303.5 ft
       Minimum pool = 235.3 ft
• Usable active conservation storage = 23,600 AF
  Joint use reservoir storage = 30,000 AF