Schedule
Environmental Services originally paused the project but has now completed the design and has a contractor who will begin construction mid-June 2025. The entire project is anticipated to be complete by July 2026.
Work hours will be from 7 a.m. to 6 p.m., Monday through Friday. There will be periodic traffic impacts while working on the sewer line in Terwilliger.
Project Area
The construction area is in the right-of-way on the east side of S Terwilliger Blvd just north and across from S Northgate Ave.
What’s Happening Now
In the coming weeks, crews may be in the project area preparing for construction. Activities may include:
- Inspecting the sewer pipes and maintenance holes.
- Locating underground utilities and marking them with paint or small flags.
- Installing tree protections and erosion controls.
- Removing vegetation and trees, trimming trees if necessary.
- Posting temporary traffic control signs.
- Staging equipment and materials.
- Taking photos of existing conditions.
- Other activities to establish a safe work zone and prepare for construction.
For more information on these pre-construction activities, visit portland.gov/bes/pre-construction.
What to Expect During Construction
A brief guide on what you can expect during construction projects conducted by Environmental Services and their contractors can be found atportland.gov/bes/constructionimpacts.
We Want to Hear from You
Please let us know if you have a concern or question about future construction near you. Be sure to include your name, property address, and project name (S Terwilliger) in your voicemail and email so we can provide you more details about what to expect in front of your property. Also, please write “S Terwilliger” in the subject line of your email.
- 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.
Project Background
In 2017, Environmental Services installed a new sewer line on S Terwilliger Boulevard from S Powers Court to Highway 43. Several months after construction was completed, a sag was discovered in the section located west of S Northgate Avenue (east of Powers Court and west of Castleridge Lane). That section of pipe is not operating according to design standards. It requires frequent and costly cleaning and maintenance, and the pipe is at risk of failing. Engineers suspect that a mix of very soft soils and high groundwater at this location caused the pipe to sag. A sag in a pipe can slow or prevent sewage from moving through the pipe. The ground conditions in this location create a further risk of the pipe failing completely.
What is a Lift Station?
A lift station “lifts” sewage and wastewater up to a higher elevation and discharges it to a new maintenance hole and sewer line. This is different than a pump station, which pumps the sewage and wastewater over some distance through a force main pipe to a treatment plant. The lift station will lift sewage and wastewater up to a new pipe that is in more stable soil. The lift station will be located underground. An electrical control panel and radio antennae will be located above ground, along with a parking space for maintenance access.
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Sign up for weekly email or text message updates for the S Terwilliger Sewer and Lift Station Project through our free GovDelivery subscription service. These updates are the best way to stay informed about what’s happening and what to expect. You can also sign up for bulletins on other projects and topics.
This project will help protect the health of the Tryon Creek Watershed.