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

Project Information

Environmental Services has begun construction on 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 facility (or 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 began on July 21, 2014, and is expected to last until mid-late August. Crews are currently working in the right east-bound lane of SW Beaverton-Hillsdale Highway, as well as in the gully near Fanno Creek, where they are repairing the existing stormwater outfall pipe. Next, they will begin removing pavement and revegetating SW 21st from Beaverton-Hillsdale Highway toward SW Carolina. They will also install a pipe to carry stormwater under the highway to the new outfall. When work is completed on SW 21st, crews will install a trail to give pedestrians safe passage off of the highway.

Traffic Control

When work is taking place in Beaverton-Hillsdale Highway, traffic controls will be in place to limit traffic traveling along the highway near the work site. Drivers in the area should expect delays during construction.

  • Construction on Beaverton-Hillsdale Highway will close some traffic lanes.
  • Even though there is no work planned for SW Bertha Boulevard, this project will close a short segment of northbound SW Bertha Boulevard, from SW Bertha Court to Beaverton-Hillsdale Highway in order to direct traffic around the work site on the highway. The closure will be in effect 24 hours a day until the second week of August. After that, it may be closed during regular construction hours for one to two more weeks.

**Traffic heading to westbound Beaverton-Hillsdale Highway from SW Vermont and Bertha Boulevard should follow the signed detour route or use another route.**

**Traffic heading to eastbound Beaverton-Hillsdale Highway from SW Vermont and Bertha Boulevard can take SW Bertha Court.**

  • Travel lanes on southbound/eastbound SW Bertha Boulevard from Beaverton-Hillsdale Highway toward SW Vermont will remain open.
  • Pedestrians should detour around the work site.

Construction Hours and Noise

Normal work hours will be 7:00 a.m. to 6:00 p.m. Monday through Friday. 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. Please call the noise hotline at 503-823-6290 with any after-hours concerns about noise. For questions or comments during work hours, please contact Becky Tillson at 503-823-2827 or

For More Information

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