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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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Basin 3/Tryon Headwaters


MapIn January 2018, Environmental Services initiated a stormwater study in Basin 3 and the larger 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 (PBOT) for street and stormwater improvements along SW Capitol Highway between SW Garden Home and SW Taylors Ferry Road.

During the planning of the SW Capitol Highway project, Basin 3 (one of the four subbasins that SW Capitol Highway drains to) was identified as having a variety of known, persistent drainage issues.

Basin 3 and Tryon Headwaters Implementation Strategy

Throughout 2018, Environmental Services staff collected data and information, ranging from historical reports from residents of stormwater issues in the neighborhood to new data from flow monitors. We gained a better understanding of the existing public-private patchwork system, how water moves through it, and how much water needs to be managed.

Bureau staff worked with the local community to find ways to manage stormwater throughout the neighborhood, instead of just one property at a time. Staff identified a range of public and private investments that will help improve stormwater management. These investments have been grouped together into short-, medium-, and long-term projects. This will help us address immediate needs while we study and design more complex long-term solutions.

In 2019 and 2020, BES started implementing several of the short and medium term projects to slow stormwater, reduce local flooding, and improve water quality before it discharges to the local Spring Creek.  

For More Information

With questions or comments, please contact Lisa Moscinski at 503-865-6447 or