Skip to Main Content View Text-Only

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Suite 1000, Portland, OR 97204

Tryon Creek Trunk Sewer Repair Project

photo of Tryon Creek trunk sewer


The Tryon Creek Trunk Sewer is a 30-inch, above-ground pipe that carries sewage from parts of southwest Portland and Lake Oswego to the City of Portland’s Tryon Creek Wastewater Treatment Plant in Lake Oswego. Environmental Services is planning repairs, including a seismic upgrade, to a portion of the 50-year-old pipe between the Tryon Creek State Natural Area to the Lake Oswego treatment plant.

Environmental Services is developing alternatives to the best way to repair the sewer while protecting native steelhead, cutthroat trout and coho salmon in Tryon Creek.

Heartbleed Security Notice

A serious security vulnerability known as "Heartbleed" was recently discovered in OpenSSL, a popular software library commonly used by many websites on the internet to encrypt communication between a user's computer and a web server. is NOT affected by this vulnerability as it does not use the OpenSSL software library. Please rest assured we are dedicated to protecting your security on this website.