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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

Table of Contents
Combined Sewer System

Most of this subwatershed is served by a combined sewer system. Portions of the system, generally east of the Highway 26 tunnel, were originally installed in the late 1800s and extended in 1889, 1891, 1894 and 1916. Major trunklines run along Highway 26 and SW 17th between Market and Burnside with diameters ranging from 3 to 9 feet. The system’s primary diversion structure is near NW 11th and Everett. CSOs are discharged to Outfall 11 just downstream from the Broadway Bridge.

1867-1899 63883.0 1" - 12" 117952.0
1900-1945 59198.0 13" - 24" 34049.0
1946-2001 30652.0 > 25" 24398.0
No Data 38291.0 No Data 15625.0
  192024   192024
Maps & Files

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