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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

California Subwatershed Facts

  • The subwatershed consists of 267 acres in southwest Portland.
  • Purple martins have been observed in the vicinity of Willamette Park.
  • There are 1,378 feet of open stream channels in this subwatershed.
  • Thirty nine acres of the subwatershed are parks and open space, 46 acres are in public ownership.
  • About half of this subwatershed is impervious area, mostly streets.
  • Willamette Park provides stop-over habitat for osprey, hawks, herons, and neo-tropical migratory birds.
  • Forty one acres of the subwatershed are forested.
  • Thirty nine acres of the subwatershed have woodland type tree canopy.
  • One perennial creek and several seasonal creeks originate in George Himes Park near Terwilliger Parkway and flow to a combined sanitary and stormwater pipe near Interstate 5.
  • 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 Nature Park to the north and Tryon Creek State Natural Area to the south.

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.