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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, 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.


Columbia Slough Big Pipe

Columbia Slough projects completed in 2000

West Side Big Pipe

West side projects completed in 2006

East Side Big Pipe

East side projects completed in 2011