Five filtration systems and 10 stormwater treatment facilities are in the works in Northwest Portland.

The Oregon Department of Transportation (ODOT) infrastructure projects are intended to clean stormwater runoff from the Fremont Bridge, the St. Johns Bridge and elsewhere along U.S. Route 30.

“These new systems will connect into our current stormwater pipes to remove large debris such as trash and pollutants such as metals and oil from the water,” ODOT spokesperson David House stated in an email.

ODOT’s estimated total cost for design and construction is $37 million.

The five filtration systems will be next to the bridges, and the 10 stormwater treatment facilities will be along U.S. 30. All will collect stormwater from roadways and filter it before releasing it to the Willamette River between Sauvie Island and downtown Portland. Most sites are underground and will not be visible from roads and sidewalks, House stated.

“Rain from roads and other hard surfaces picks up trash, metals such as copper and lead, oil and other pollutants,” House stated. “When untreated, these pollutants wash into drains and nearby waterways diminishing water quality and habitat. Each filtration system we build will improve water quality in the Willamette River by removing large debris like trash and smaller pollutants like metals and oil before they reach the river.”

Project sites will include: the St. Johns Bridge, with two underground filtration systems (one beneath North Philadelphia Avenue on the east end and one beneath Northwest Knappton-General Road on the west end); the Fremont Bridge, with an aboveground filtration system at the base on the east end as well as an underground filtration system beneath the landscaping at the base on the west end; near the Willamette Greenway trail; and at the Fremont Bridge west ramps (at 1500 N.W. Raleigh St.), with an underground stormwater treatment system that includes a 12-foot-tall prefabricated control room and an approximately 20-foot-tall storage tank. Also, the underground treatment systems along U.S. 30 will be built in the highway shoulder between Northwest Nicolai Street and Northwest Marina Way.

WSP has produced project design and specifications for ODOT, according to House. That will allow flexibility in specific site solutions, which will be produced by the contractor for required reviews ahead of construction, he stated.

Bidding for a general contractor opened on Monday. ODOT expects to select a contractor by this spring, House stated.

Construction is expected to begin sometime this year and require approximately two years to complete.

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