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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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Inverness Force Main Repair

UPDATED APRIL 18, 2017

Ped/Bike Crossing Bridge Closure

The Columbia Slough bridge north of the Columbia Boulevard Wastewater Treatment Plant will be closed until May 15, 2017.


Repair continues on a damaged section of the Inverness Force Main suspended under the Columbia Slough pedestrian bridge over the Columbia Slough. Repairing this pipe is essential for protecting water quality and public health.

The 11-mile force main carries flow from the Inverness Pump Station east of I-205 to the Columbia Boulevard Wastewater Treatment Plant. A 36-inch pipe splits into a 20-inch and a 30-inch main two miles from the treatment plant and both pipes run under the pedestrian bridge.

When maintenance crews discovered the corrosion-caused leak in the 30-inch pipe, BES transferred flow to the 20-inch pipe. The project will insert a 24-inch HDPE pipe into the damaged main and connect to the existing pipe at both ends of the bridge.