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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Suite 1000, Portland, OR 97204

Willamette Subwatersheds

Willamette Subwatersheds

watershed map imageThe Willamette Plan Area is divided into 27 subwatersheds, drainage areas of only a few square miles or less. Their smaller size makes subwatersheds easier to map and assess for restoration potential. Since every part of Portland is in a subwatershed, everyone can help improve the health of the Willamette River by working in their own neighborhood.

Detailed information about the subwatersheds, along with four Willamette River segments is compiled in the Characterization Report under six categories: Habitat and Biological Communities, Infrastructure, Land Use and Population, Landscape and Hydrology, Stewardship, and Water Quality.


Heartbleed Security Notice

A serious security vulnerability known as "Heartbleed" was recently discovered in OpenSSL, a popular software library commonly used by many websites on the internet to encrypt communication between a user's computer and a web server.

PortlandOregon.gov is NOT affected by this vulnerability as it does not use the OpenSSL software library. Please rest assured we are dedicated to protecting your security on this website.