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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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West Side Big Pipe

West Side Big Pipe Project

The City of Portland broke ground on the West Side Big Pipe in November 2002 on Swan Island and completed construction in September 2006, more than two months ahead of schedule.

West Side Big Pipe

  • 14-feet in diameter, 3.5-miles long, 120-feet deep
  • Runs beneath Waterfront Park and crosses under the Willamette River to Swan Island
  • Built by two tunnel-boring machines, one tunneling north from the Nicolai Shaft to Swan Island, the other tunneling south from the Nicolai Shaft to the Clay Street Shaft 

Swan Island Pump Station

  • 160 feet deep with an inside diameter of 124 feet
  • Pumps sewage from the West Side Big Pipe, and will pump sewage from the East Side Big Pipe, through force mains to the Columbia Boulevard Wastewater Treatment Plant
  • Pumping capacity of 220 million gallons per day
  • Pump station site includes an odor control facility and isolation gate structure 

Tunnel Access Shafts

  • Four large access shafts on the west side of the Willamette River and a confluent shaft on Swan Island
  • Main mining shaft at Northwest Front and Nicolai was 55 feet in diameter and 120 feet deep
  • Tunnel access shafts also at NW Northrup Street, SW Ankeny Street and SW Clay Street 

Southwest Parallel Interceptor

  • Extends nearly three miles from the intersection of Southwest Taylors Ferry Road and Virginia Avenue to Clay Street
  • Ranges in size from 36-inches on the south end to 72-inches where it connects to the West Side Big Pipe at Clay Street 

Peninsular Force Main

  • Pressure line moves sewage from the Swan Island Pump Station to an existing sewer tunnel near North Greeley Street and North Going Street
  • 5,000 feet long consisting of two parallel pipes, 30-inches and 48-inches in diameter


September 2006 West Side Projects dedication at the Swan Island Pump Station