Tualatin Interceptor and Siphon Improvements

• LocationTualatin ,OR
• Timeline2019
• Construction
  MethodsMicrotunneling Design-Build

Scope

Michels used microtunneling to build a 470-foot long tunnel approximately 40 feet under the Tualatin River. The 84-inch diameter tunnel has a 650-foot radius U-shaped curve,which is a North American record. Inside the 82" RCP casing, the tunnel contained a bundle of three HDPE pipelines 14 inches, 16 inches and 30 inches in diameter. The carrier pipes replace the original wastewater siphon and provide service for the municipality.