Piedmont Priority Outfalls Plan

Sewer and Stormwater
In Planning
Environmental Services is developing the Piedmont Priority Outfalls Plan. This planning effort will protect public health and the environment by identifying ways to reduce pollutants in stormwater entering the Columbia Slough.
Planning work is expected to continue through 2024.
On this Page

This plan is part of a larger effort to protect the Columbia Slough from erodible solids and associated pollutants that may flow into the slough from stormwater that runs off Columbia Boulevard, other City rights-of-way, and adjacent properties in the Piedmont, Woodlawn, and King Neighborhoods including industrial and commercial facilities.

Plan Area

The plan will focus on Columbia Boulevard between North Albina Avenue and Northeast 33rd Avenue. Planning effort will also study potential solutions in the surrounding neighborhoods. 

Piedmont Priority Outfalls Plan Focus Area


The planning process will continue through 2024. The result of this process will be a series of recommendations on how the City can best reduce pollutants in stormwater entering the Columbia Slough. Once initiated, design and construction are estimated to take five to ten years to complete.

What's Happening Now

Planners and engineers are working to identify possible ways to improve stormwater runoff quality and reduce pollution from entering the Columbia Slough. Planners are close to crafting a set of potential alternatives that will be shared with the community for review and comment. Bureau staff will be reaching out to the community to gather feedback on how well these potential alternatives align with community priorities.

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This project will help protect the health of the Columbia Slough Watershed