SE Stark Trunk Sewer Project

Sewer and Stormwater
Environmental Services is starting a project to install a stormwater diversion structure that will redirect combined sewer from the Stark Trunk pipeline to the Willamette River during heavy rain events, reducing the likelihood of sewage releases into building basements and streets.
Construction is expected to begin June 13 and will be completed in phases over the next year and a half.
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This project also includes repairing a large-diameter concrete sewer pipe along SE Stark Street between SE 6th Avenue and the Willamette River. Repairs will increase the sewer’s resiliency, extend its service life for 60 years or more, and help prevent sewage releases.

Project Area 

The stormwater diversion structure will be built on SE 3rd Avenue between SE Stark Street and SE Washington Street. Sewer pipe repair work will occur on SE Stark Street from SE Water Avenue to SE 6th Avenue.

General Schedule

The project will be completed in two phases.

Phase 1: Stormwater Diversion Structure

Phase one will include construction of a stormwater diversion structure on SE 3rd Avenue between SE Washington Street and SE Stark Street. This work is expected to start June 13, 2022, and will take about five months to complete.

Phase 2: Pipe Work

Phase two will repair the sewer pipe on SE Stark Street between SE 6th Avenue and the Willamette River. Phase two is expected to begin summer 2023 and take about six months to complete. See project area map for location of the pipe work.

Traffic Impacts

A vehicle detour and bicycle diversion will be in place during construction of phase one. Vehicles traveling westbound on SE Stark Street will be detoured to SE Martin Luther King Jr Boulevard and SE Yamhill Street. Vehicles traveling eastbound will take SE Taylor Street to SE Grand Avenue. Those riding bicycles will take SE Water Avenue around the street closure on SE Stark Avenue and may use sidewalks on SE 3rd Avenue.

SE Washington Street is closed to vehicles between SE 2nd Avenue and SE 3rd Avenue (with the exception for local deliveries). Sidewalks will remain open.

What's Happening Now

Over the next few weeks, crews are excavating the street for the Stormwater Diversion Structure. All work will occur between 7 a.m. and 6 p.m. 

This Week

Crews will excavate, prepare and place the Stormwater Diversion Structure in SE 3rd Avenue. 

Week of July 4

Crews will continue to excavate, prepare and place the Stormwater Diversion Structure in SE 3rd Avenue. 

Work will not take place on the 4th of July holiday. Work will resume on July 5.

Week of July 11

Crews will form the Stormwater Diversion Structure in SE 3rd Avenue.

Crews will repair and replace the pipe in SE Stark Street between SE 2nd and SE 3rd Avenue.

What to Expect During Construction

You can expect the following activities and impacts during construction:

  • Noise, Vibration, and Dust: Construction creates noise, vibration, and dust and disrupts normal neighborhood activity.
  • Equipment Storage: Equipment and materials may be stored on streets overnight.
  • No Parking: Little or no on‐street parking will be allowed in and near work zones, especially during work hours. On days when crews will be working in front of your house or nearby, please plan ahead. If you park your vehicle on the street, plan to move it off the street by 7 a.m. and return it at 6 p.m.
  • Traffic Delays: Expect traffic delays in and near the work area.
  • Lane Restrictions and Street Closures: It is too soon to know exactly what traffic controls will be necessary to set up a safe work zone and construct the sewer improvements. The contractor will develop detailed traffic control plans before construction begins at a location.
  • Pedestrian Access: If temporary crosswalk and sidewalk closures are necessary, signage will indicate the alternate way for pedestrians to proceed. 
  • Services Maintained: Sewer, water, and other utilities are expected to remain in service during construction.
  • Work Hours—Work hours are 7 a.m. to 6 p.m., Monday through Friday. Sometimes we work on Saturdays from 7 a.m. to 6 p.m.

Construction Methods

Crews will use open trench excavation to construct the stormwater diversion structure. This method consists of excavating down to a specific depth, inserting a pipe, and then backfilling the trench. Visit the construction methods webpage to learn more.

We Want to Hear from You

Environmental Services will inform residents about project activities and respond to questions and concerns in a timely manner.   

Sewer Emergency: In the event of a sewer backup or basement flooding, call the Maintenance hotline immediately at 503-823-1700. It is staffed all hours and all days, 24/7.  

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