Most City offices closed Wednesday, June 19, to observe Juneteenth

The City of Portland recognizes Juneteenth as a formal day of remembrance to honor Black American history and the end of slavery in the United States. Learn about Juneteenth.

S Terwilliger Sewer and Lift Station Project

Sewer and Stormwater
Environmental Services is designing a project to replace approximately 450 feet of public sewer pipe and install a sanitary lift station on S Terwilliger Boulevard just north of S Northgate Avenue. Unstable ground conditions pose a risk of the pipe failing. This project will address this.
The project is currently in design. Construction is anticipated to begin in the summer of 2024 and take up to six months to complete.

Project Area

The map below illustrates the project location. 

S Terwilliger Sewer and Lift Station Project Map

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.

Sign Up for Updates

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.