Henry Creek (Arlie Mitchell Road) Culvert Replacement



Updated: Oct. 19, 2023

The 12’ metal culvert carrying Henry Creek under Arlie Mitchell Road in the Rhododendron area does not easily allow fish and wildlife to pass upstream and will be replaced with a modular bridge. This project is the result of collaboration among several groups, including Clackamas County, ODFW, the City of Portland, the Forest Service and the Freshwater Trust. The Freshwater Trust will lead the project. Clackamas County will provide survey, right-of-way acquisitions, plan review, public outreach, and construction inspection services. 


To minimize potential impacts to the roadway due to flooding and to provide access for fish and other aquatic organisms to reach upstream cold-water habitat.  


  • Design: April 2023 – June 2023
  • Right of way: Feb. 2024 – June 2024
  • Construction: July 2024 – August 2024

Traffic impact

  • A road closure may be needed during construction. 
  • Project is expected to take up to 2 months to construct.
  • Site work planned to take place during the prescribed in-water work period of July 15 to August 31

Current activities

  • Project in design phase


  • Project estimate $1 million. 
  • Funding is provided from grants including: Oregon Department of Fish and Wildlife, the City of Portland, the Oregon Watershed Enhancement Board, and a contribution from county road funds. 
Department Staff
Devin Patterson

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