Henry Creek (Arlie Mitchell Road) Culvert Replacement

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. 

Why

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.  

Schedule

• Design: April 2023 – June 2023
• Right of way: Feb. 2024 – June 2024
• Construction: July 2024 – December 2025

Traffic impact

• A road closure will be needed during construction for up to 2 months; tentatively planned from 7 a.m. to 7 p.m., Aug. 19 - Dec. 13, 2024.
• Detours: Access to properties south of the culvert crossing on Arlie Mitchell Road, will use Arlie Mitchell Road. Access to properties north of the culvert crossing, and to Henry Creek Road, will use Henry Creek Road.  
• Project is expected to take up to 5 months to construct.
• Site work planned to take place during the prescribed in-water work period of July 15 to August 31

Current activities

• Preparing for construction

Funding

• Project estimate $1.4 million. 
• Funding is provided from grants including: Oregon Department of Fish and Wildlife, the City of Portland, the Oregon Watershed Enhancement Board, Forest Service, Freshwater Trust, and a contribution from county road funds. 

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