The six-mile, 22-foot-diameter tunnel that runs along the east bank of the Willamette River in Portland, Ore., is the largest public works contract approved by the city and connects to a similar project at the Swan Island Pump Station. The pipe is part of a project to collect overflow from 12 existing combined sewer outfalls. Seven shafts up to 160 feet deep, with diameters between 49 feet and 67 feet, will be along the tunnel's route with help from a crawler crane.

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