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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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Carson Basin–SW 39th Stormwater Project


Over the last year Environmental Services has been working with neighbors in the Tryon Headwaters area to create a plan to address some of the stormwater challenges facing residents.

In January 2018, Environmental Services initiated a stormwater study in the Tryon Headwaters area (Tryon Creek above I-5). This work is complementary but separate from the SW Capitol Highway project. The SW Capitol Highway: Multnomah Village to West Portland project is a joint effort by Environmental Services, Portland Water Bureau, and Portland Bureau of Transportation for street and stormwater improvements along SW Capitol Highway between SW Garden Home and SW Taylors Ferry Road.

For the Tryon Headwaters planning process, we focused on identifying a suite of public and private actions and investments to address stormwater management and conveyance in the area, at a neighborhood scale.

Carson Basin-SW 39th Project GoalsCarson Basin Map

One of the strategies identified in the Tryon Headwaters planning process is the Carson Basin-SW 39th project, which includes extending the public storm system to reduce flooding and stormwater issues in your neighborhood.

For several years, Environmental Services has been hearing about flooding issues in the area of SW 39th and SW 37th due to a lack of stormwater system. Design is underway to add a stormwater pipe from SW 39th to SW 37th in coordination with adjacent private properties. In addition, during investigatory work we learned a portion of the private stormwater pipe along SW Carson is undersized and is in poor condition. Environmental Services is replacing the pipe along SW Carson as part of the project to ensure a safe connection and adequate conveyance of stormwater.

The benefit of the Environmental Service investment results in limiting localized  flooding within the Carson Basin, provides a stormwater connection for private properties and street runoff, and will remove stormwater inflow into the sanitary sewer system.

We are in the design process and construction is expected summer 2020. 

For More Information

With questions or comments, please contact Lisa Moscinski at 503-823-3663 or