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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

Stephens Subwatershed Facts

  • Stephens CreekThe Stephens Creek subwatershed covers 754 acres of southwest Portland.
  • 144 acres of the subwatershed are forested.
  • 61 acres of the subwatershed have woodland type tree canopy.
  • The watershed has about 19,500 feet of natural stream channel (3.7 miles).
  • A 3.5 acre Pacific willow forested wetland at the mouth of Stephens Creek is the most extensive remaining floodplain on the creek.
  • Willamette River ESA listed fish species continue to use lower Stephens Creek as off-channel habitat. Fish species include Chinook, coho and steelhead
  • The forested areas and streams of the subwatershed provide an important link between the West Hills and the Ross Island-Oaks Bottom ecosystem complex to the east, and between Marquam Stephens CreekNature Park to the north and Tryon Creek State Natural Area to the south.
  • Stormwater from roads, parking lots and roofs generally flows directly into Stephens Creek, which then flows to the Willamette River.
  • Impervious area, mostly streets, covers less than half of this subwatershed. The heaviest concentration of impervious area is in the I-5, Barbur Corridor in the Burlingame area.
  • Parks and open space make up 168 acres of the watershed; 66 acres of land are in public ownership.

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.