In 2019, Multnomah County discovered low-density cellular concrete (LDCC) had been leaching high pH water into the creek and nearby wetland from a previous project. The County immediately took action to address the concern and stop the material from leaching into the waterways. This project is the final step in remediation.
Project Information
- Location: SE Cochran Road, between Paloma and Troutdale (map)
- Schedule: Road re-opened 1/29/26
- Estimated Cost: $4 to $5 million
- Funding Source: County Road Funds
Project Description
We demolished and rebuilt the road surface and related parts of the approaches to the Cochran Road Bridge over Beaver Creek.
This bridge was built in 2019 to replace an old culvert and allow salmon and other fish to migrate upstream. It used low-density cellular concrete (LDCC) in the approach fill. The LDCC has been leaching high pH water into the creek and nearby wetland.
This project fully removed the LDCC from the bridge approaches and rebuilt the roadway. It stopped the high pH discharge and reduce flows to the subdrainage system.
To do this, we had to demolish and rebuild the road surface, shoulder, guardrail, storm drains, retaining wall and french drains. Damaged soil was removed and replaced with clean wetland soils, and is being replanted.
Traffic Impacts
The road re-opened at the end of January 2026. The road will remain open while re-planting is completed this winter and spring.
We are interested in your feedback on this project. Please fill in the form below if you have comments, questions or suggestions.