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Fanno Creek Trail section reopens near Garden Home pumping station


After surge tank installation, new construction to commence in August

A portion of the Fanno Creek Trail reopened today after it was closed June 10 to replace maintenance access structures related to the Fanno Creek Pressure Sewer near Southwest 86th Avenue in Garden Home.

The trail was scheduled to reopen on Monday, July 1, but the need for additional repairs and testing slightly extended the closure, said Debbie Caselton, spokeswoman for Portland’s Bureau of Environmental Services.

The trail was closed for a project to replace three maintenance access structures in the Fanno Pressure Sewer that were damaged when bureau crews activated the Fanno Basin Pump Station in November 2012. After replacing the access structures, testing showed a loss of pressure in the wastewater system. The contractor located and repaired the source of the leak and completed repairs to re-open the trail before the July 4th holiday.

The bureau also has completed installation of a $1 million surge tank at the pump station to protect the pressure sewer by absorbing rain and wastewater surges during peak flow times. The Fanno Basin Pump Station is currently not operating, with wastewater flowing by gravity to Washington County's Clean Water Services sewage treatment facility at Durham. The Portland bureau will activate the pump station later this summer.

Leaks and spills have occurred intermittently along the section of trail for years, prompting the tank installation and other measures.

The bureau will replace several more maintenance access structures along the pressure sewer before activating the new Southwest 86th Avenue Pump Station. Construction on that project should begin in August and be complete by early 2016.

Environmental Services crews are in the process of installing a surge tank to absorb sudden increases in pressure when the pump station is activated in the future. Based on its agreement with Washington County’s Clean Water Services, the department will re-activate the Fanno Basin Pump Station when pressure sewer repairs and the tank construction are complete.

Environmental Services will replace several more maintenance access structures along the pressure sewer before activating the new Southwest 86th Avenue Pump Station. Construction is scheduled to begin this August and be complete by early 2016.

What to expect during construction on the trail:

Construction hours will be from 7 a.m. to 7 p.m. Monday through Saturday. There will be no work on the July 4 holiday.

Construction vehicles and equipment will have to access the trail from SW 84th and SW 82nd avenues.

  • Vehicles and equipment will include an excavator, trench shoring boxes, and the maintenance access structures. Dump trucks will remove excavated materials at the start of the project and haul in backfill materials near the end of the project.

  • A city of Portland construction inspector will be on-site during all work hours.

    For project updates and background information, visit portlandoregon.gov/bes/fanno, email This email address is being protected from spambots. You need JavaScript enabled to view it., or call Debbie Caselton, 503-823-2831.