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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

Fanno Outfall Repair Project

Environmental Services has completed a project at SW Beaverton-Hillsdale Highway and 21st that reduces erosion and protects water quality in Fanno Creek. Work crews replaced a 130-foot long, badly deteriorated outfall pipe which carries stormwater runoff from more than ten acres into Fanno Creek. Discharges from the new outfall pipe into the creek now hit a hard surface to disperse and slow the flow to protect the stream bed and banks from erosion.

The project included closing SW 21st Avenue and removing the pavement. Environmental Services will plant vegetation along the slope later this fall. The vegetated slope and the newly constructed swale will reduce erosion into the stormwater system, keep dirt from washing into the bike lane, and absorb and filter more stormwater before it enters the creek.

The project also included adding a short path pedestrians can use to move off of Beaverton-Hillsdale onto SW Carolina.

Over the next several years, Environmental Services will remove non-native, invasive plants and restore native vegetation on about one acre around the work area near Fanno Creek.

Fanno Outfall project map


Thank you for your cooperation during this important project. Please feel free to be in touch with any questions or comments.

For More Information

With questions or for more information, please contact Becky Tillson at 503-823-2827.