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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

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Big Pipes

  • boring machine cutterhead

  • tunnel boring machines

  • cleaning a cutterhead

  • tunnel shaft construction

Construction of large, complex facilities to convey and treat combined sewage began with the 3.5-mile long Columbia Slough Consolidation Conduit, which went into service in 2000, followed by the 3.5-mile, 14-foot diameter West Side CSO Tunnel and the Swan Island CSO Pump Station in 2006, and finally the six-mile long, 22-foot diameter East Side Big Pipe in 2011.