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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204

More Contact Info

Columbia Slough Sediment Program

Columbia SloughSince 1993, Environmental Services and the Oregon Department of Environmental Quality (DEQ) have studied the Columbia Slough watershed and worked together 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 below for more information about the Columbia Slough Sediment Program.

2018 Annual Report

Columbia Slough Sediment Program annual report