1120 SW 5th Avenue, Room 1000, Portland, OR 97204
Since 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.
Columbia Slough Sediment Program annual report
Actions to improve slough sediment quality (PDF Document, 7,487kb)
2005 Sampling (PDF Document, 4,985kb)