Environmental Services will begin construction this fall on 7,600 feet of eight-inch gravity sewer in Terwilliger Boulevard from SW Northgate Avenue to Highway 43. The new sewer will connect to the 30-inch Tryon Interceptor sewer, which carries sewage to the Tryon Creek Wastewater Treatment Plant in Lake Oswego. This improvement to Portland’s wastewater collection system will help protect water quality, public health, and the environment.
The start date has not yet been determined. We anticipate announcing the schedule in early October. Sign up for our email update list to be notified when construction begins.
Construction will close SW Terwilliger for up to a year from Highway 43 to the Iron Mountain Trailhead (south of SW Casleridge Lane). Due to narrow roads and lack of shoulders, the road is being closed to safely allow enough space for open trench construction. The closure will also provide a secure staging for large equipment and materials, off neighborhood streets where possible to allow for resident parking.
For More Information
Contact Ashley Tjaden at 503-823-5281 or email Ashley at Ashley.Tjaden@portlandoregon.gov with “Terwilliger” in the subject line.
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