Cleanup Sites

​Site summary

The Columbia Slough is located south and parallel to the Columbia River and consists of approximately 31 miles of water way extending from Fairview Lake on the east side to the Willamette River on the west. Industrial and urban development along the Slough has resulted in the accumulation of a variety of contaminants in Slough sediments, some of which bioaccumulate and have also been found in fish tissue collected from the Slough. In 2005 DEQ issued a Record of Decision establishing a program to cleanup sediments at individual release sites, implement source control measures throughout the watershed to prevent further releases, and monitor conditions over the long term to ensure continued improvement.
 
DEQ is working with the City under an InterGovernmental Agreement to complete source control and sediment evaluation work throughout the Slough as it relates to discharges associated with City Outfalls. DEQ is also working with private parties at more than 30 individual sites to conduct site specific source control and sediment cleanup evaluation. In addition, as described in documents provided below, DEQ has conducted investigations in various segments of the Slough using settlement funds obtained from private parties in exchange for a liability release for their site’s contribution to contamination in Slough sediments.
 

Current documents and supporting information

Sediment-related activities

​Fact sheet

Examples – see individual site links provided in the segment-specific sections below.

Sediment data​

Sediment cleanup documents

Lower Columbia Slough cleanup sites with consent judgments providing settlements for sediment investigation/cleanup:

Middle/Upper Slough cleanup sites with consent judgments providing settlements for sediment investigation/cleanup:

Funds available for habitat enhancement

Habitat Enhancements Completed

 
​Environmental Cleanup Site Information Number (ECSI):   1283 
County Multnomah 
City:  Portland
Region: Northwest  
 

Contact 

Project Managers: 
Jennifer Sutter 503-229-6148
Sarah MIller 503-229-5040 

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	 Columbia Slough Sediment Project