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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

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Before and After: Terraced Rain Garden Project in Tryon Creek Watershed


Environmental Services and the Oregon Department of Transportation have finished construction on the Terraced Rain Gardens Project in southwest Portland. It is the largest rain garden project in Portland and manages stormwater runoff from 24 acres. The rain gardens collect runoff from Interstate 5, SW Barbur Boulevard and SW 26th Avenue, slow the flow and allow pollutants to settle out before stormwater enters Tryon Creek.

The work included planting over 11,000 native trees and shrubs throughout the project site. The vegetation holds rain to reduce stormwater volume, filters air pollutants, provides habitat, absorbs carbon to reduce greenhouse gases, and stabilizes the soil to reduce erosion.

Before construction:

During construction:

After construction:


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Matthew Burlin

June 25, 2015 at 12:23 PM

Hi Jerry,

The Oregon Department of Transportation's share of design and construction was a little over $2 million and the Environmental Services share was just under $1.3 million. Total design and construction cost was $3.3 million.

Thanks for your interest in this project.

Matt Burlin
City of Portland Environmental Services

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