SE Stark Trunk Sewer Project

Sewer and Stormwater
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Environmental Services is installing 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.
This work will be completed in two phases. Construction on Phase I began June 2022 and is expected to be complete in December 2022. Construction on Phase II is expected to begin summer 2023 and take about six months to complete.
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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. Crews expect to complete phase one at the end of December, however, this work is highly weather dependent, and rain may cause delays.

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.

Businesses Open During Construction

While you may experience delays reaching your favorite businesses, we encourage you to continue to support them during construction.

Traffic Impacts

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?

Throughout the month, crews will install monitoring boxes and Americans with Disabilities Act (ADA)- compliant curb ramps and repave SE Stark Street near SE 3rd Avenue. The monitoring boxes contain equipment that collect sewer levels and flow rates needed to maintain reliable sewer service and prevent sewage releases into buildings, streets, and waterways. Soil sampling and utility locate work will also occur to prepare for phase two coming summer 2023.  

Work schedules may change due to weather and subcontractor availability.

The Rest of This Week

Crews will continue installation of a sewer monitoring box. Americans with Disabilities Act (ADA)- compliant curb ramps will be installed at SE Stark Street and SE 3rd Avenue.

Week of December 19

Crews will continue installation of the sewer monitoring box.

Potholing for utilities within the project area is scheduled. During potholing, crews dig holes to locate utilities near the sewer line. When potholing is complete, crews fill the holes and restore the area. Potholing and geotechnical investigations will occur in the street and public right-of-way.

Week of December 26

Crews will continue installation of the sewer monitoring box.

Washington Street between 2nd and 3rd avenues is scheduled to reopen to all forms of traffic.

Sewer Monitor Box Installation Steps

During Sewer Monitor Box Installation, crews will:

  • Excavate and install new concrete pad and monitoring cabinet.
  • Install communications conduit between new monitor box and monitoring maintenance hole.
  • Install new power service to cabinet.
  • Install monitoring equipment in the sewer system.
  • Restore all disturbed asphalt, concrete, and landscape surfaces.

Because the construction of these cabinets requires coordination with public and private agencies, contractors and specialized subcontractors, there will be periods of inactivity between some of these steps. 

General Schedule

The project will occur in two phases. Phase one is constructing the Stormwater Diversion Structure at SE 3rd Avenue and Stark Street. This work began in June 2022. Crews expect to complete phase one at the end of December, however, this work is highly weather dependent, and rain may cause delays.

Phase two will repair the sewer pipe on SE Stark Street between 6th Avenue and the Willamette River. Phase two is expected to begin in summer 2023 and will take about six months to complete.

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. When weather forecasts predict high temperatures, crews will begin at 6:00 a.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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