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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204

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01-24-14: SW 86th Avenue Pump Station Construction Update


SW 86th Avenue Pump Station Project Construction Update: January 24, 2014

Environmental Services works to protect water quality and the environment through wastewater collection and treatment, sewer construction and maintenance, stormwater management, and stream and watershed restoration.  When theSW 86th AvenuePump Station is complete at the end of 2015, it will increase the capacity of the Fanno Basin Sewer System to ensure that the system can handle all wastewater flows during large rain storms.  It will protect public health and watershed health, specifically Fanno Creek.

A project map is available at:


Construction crews continue to install the underground wet well and pump facility structure. The third of four concrete pours of the wet well structure will take place in the coming months.  The structure has strategically been excavated and the weight of the structure gradually pushes the structure below ground.

The caisson is a watertight structure, which will be approximately 26 feet in diameter and over 40 feet deep.  The structure appears to be above ground right now, but neighbors have been watching the gradual disappearance of the structure (approximately a foot a day) into the ground. 


  • Environmental Services received a complaint about a persistent noise coming from the large crane on the construction site last week.  The noise was described as a baby elephant being tortured. The source was identified as a dry brushing on an idler sheave at the boom tip of the crane and was serviced and greased.  The contractor assured if this happens again they will stop immediately and correct the issue.
  • A neighbor emailed regarding construction trucks idling onSW Scholls Ferry Roadat SW 86th, causing exhaust fumes to penetrate their home, as well as concern regarding the location being a school bus stop.  The contractor was immediately notified and the trucks were informed to not park or idle in that area.
  • Several inquiries have been received about the wet well structure and making sure that it will indeed be underground and not above-ground as seen during construction.



Outreach staff will be back on the Fanno Creek Trail atSW 86th Avenuewhen the weather improves.

Sign up for project updates and project information at, email, or call Debbie Caselton at 503-823-2831. Updates will also be provided on the construction hotline at 503-823-1312.