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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

More Contact Info

SW Stephenson Roadside Swales

Environmental Services completed work in March 2016 on a stormwater management project on SW Stephenson Street between SW 35th Avenue and Boones Ferry Road (see map below). This project  helps protect water quality in Tryon creek.

Stephenson Project Map

Project Background

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

This project constructed swales planted with a combination of grasses and low-growing plants to help protect the channel from erosion and reduce stormwater pollutants. As part of the project, the Portland Bureau of Transportation added four-foot wide, paved shoulders.

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 503-865-4300.