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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

Tryon Creek Tributaries

The Tryon Creek Watershed is divided into three subwatersheds:

Tryon Creek Mainstem

The Tryon Creek subwatershed is 3,083 acres. The mainstem of Tryon Creek is about sevem miles long from its headwaters near Multnomah Village (just north of Interstate 5 and Highway 99) to its confluence with the Willamette River in Lake Oswego at the Highway 43 crossing.

Arnold Creek

The Arnold Creek subwatershed is about 775 acres. Arnold Creek joins Tryon Creek at the Boones Ferry Road crossing.

Falling Creek

The Falling Creek subwatershed is about 283 acres. Falling Creek joins Tryon Creek at SW 26th Avenue and Taylors Ferry Road. Other smaller tributaries flow into Tryon Creek both within and outside Portland's city limits.

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.