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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

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

Columbia Slough Sediment Program

Since 1993, the City of Portland, Bureau of Environmental Services and the Oregon Department of Environmental Quality (DEQ) have studied the Columbia Slough watershed and have implemented actions to improve sediment quality.

Studies show widespread, low-level contamination throughout the slough's sediments with a few isolated areas of higher contamination. The city's cleanup approach includes controlling the source of the contaminants, cleaning up the most contaminated areas, and long-term monitoring.

Choose from the links on the left for additional information about the Columbia Slough Sediment Program.

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.

PortlandOregon.gov 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.