Skip to Main Content View Text-Only

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

More Contact Info

Marquam-Woods Subwatershed Facts

  • Cottonwood BayThe Marquam-Woods subwatershed covers 1,153 acres of southwest Portland.
  • 321 acres of the subwatershed are forested.
  • 53 acres of the subwatershed have woodland type tree canopy.
  • There is one perennial creek, Marquam Gulch (aka Caruthers Creek), and there are several seasonal creeks that originate in Marquam Nature Park. The streams flow to the combined sanitary and stormwater system at the northeast corner of the park.
  • About half of this subwatershed is impervious area, mostly streets.
  • There are 22,898 feet of stream channels in this subwatershed.
  • Marquam canyon, a 71-acre natural area, contains relatively high quality habitat compared with other resource sites in the city.
  • Marquam BridgeParks and open space comprise 167 acres of the subwatershed; 276 acres of land are in public ownership.
  • 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.