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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

SW Stephenson Roadside Swales

cross section diagram of planted swaleEnvironmental Services is designing improvements to about 2,760 feet of ditches along SW Stephenson Street between SW 35th and SW Boones Ferry Road. Work will begin in spring or summer 2015.

Ditches on SW Stephenson carry stormwater runoff from the street directly to Fanno Creek and its tributaries. The fast-moving water causes erosion and carries pollutants washed off streets.

This project will plant swales with a combination of grasses and low-growing plants. The vegetation will help protect the channel from erosion and may help reduce stormwater pollutants. As part of the project, the Portland Bureau of Transportation will add four-foot wide, paved shoulders.

SW Stephenson project map

Environmental Services is working with citizens and neighborhood groups on project plans including impacts to trees in the project areas.

The Fanno-Tryon Watershed Management Plan identified these improvements as a way to improve drainage and pedestrian safety and protect water quality. Over one-third of the roads in the watershed are paved and have no curbs. Ditches border most of them.

For More Information

Contact Lisa Moscinski at 503-823-3663.