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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, Portland, OR 97204

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Balch Consolidation Conduit Ventilation

This project improved the performance of the Balch Consolidation Conduit, which Environmental Services completed in 2011 to help control combined sewer overflows to the Willamette River. The 8,500-foot pipeline carries stormwater runoff and sewage to the West Side Big Pipe.

Before the city completed this project, stormwater draining into the 84-inch diameter conduit during wet weather pushed air through the pipe with enough pressure to move manhole covers along the pipeline route. This project secured and sealed manholes in three work areas and installed an underground vault to vent air and relieve pressure in the pipeline (see map below).

Balch Venting Project map 

For More Information

Contact Joe Annett at 503-823-2934.