Skip to Main Content View Text-Only

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, Portland, OR 97204

Fanno Outfall Repair Project

Fanno Outfall project mapEnvironmental Services is nearly finished with a project to replace a pipe that carries stormwater runoff from streets and other hard surfaces in parts of Hillsdale. Runoff from more than 10 acres between SW 18th and SW 21st avenues near Beaverton-Hillsdale Highway drains into the corrugated metal pipe.

The pipe runs underneath Beaverton-Hillsdale Highway near the Bertha triangle and emerges in a deep ravine where it drains into Fanno Creek. Portions of the 12-inch wide, 130-foot long pipe are badly corroded and failing.

This project will replace the pipe and revegetate the banks of Fanno Creek in and around the work area. The project will also include constructing a swale to manage stormwater and sediment, and removing and planting a portion of SW 21st Avenue (see map).

An informal trail will provide pedestrians a way to get off of Beaverton-Hillsdale Highway. The closure of SW 21st Avenue is recommended in the Portland Bureau of Transportation's High Crash Corridor Plan for this area.

Project Schedule

Construction is scheduled to be complete the week of September 22. When work is complete, crews from the Portland Bureau of Transportation will install road closure signs on SW 21st.

Re-vegetation Work

Re-vegetation staff are currently working on invasive species removal, and will be planting native species on about 1 acre within and outside of the work area this winter and next winter.

Construction Hours and Noise

Normal work hours will be 7:00 a.m. to 6:00 p.m. Monday through Friday. Work on Beaverton-Hillsdale Highway is limited to the hours of 7:00 a.m. to 3:00 p.m. The city’s contractor may schedule work during the same hours on Saturdays. Several bypass pumps will operate day and night to keep stormwater out of the outfall pipe during construction. With questions, comments or noise complaints, please contact Becky Tillson at 503-823-2827.

For More Information

With questions or for more information, please contact Becky Tillson at 503-823-2827. To be added to an email update list, email Becky with “Fanno Outfall Project” in the subject line.