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West Side CSO Tunnel, Shafts, Pump Station and Pipelines Project
Portland, Oregon, U.S.
City of Portland Bureau of Environmental Services
Scheduled for completion in August 2006
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Keeping the Willamette Clean
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Combined sewer overflows (CSO) occur nearly every time it rains in Portland, Oregon, filling the Willamette River with polluted stormwater runoff from drainage areas on the city's west and east sides. As part of a comprehensive effort to improve water quality in the lower Willamette, the City of Portland in 1991 initiated efforts to reduce CSOs in the river by 94% by 2011.
PB is aiding the city by providing final design and design services during construction of the centerpiece of its CSO reduction program, the West Side CSO Project—also known as the Big Pipe. The 3.5-mile, 14.5-foot diameter soft-ground tunnel will be located along the west bank of the river under Tom McCall Waterfront Park and the central business district, crossing under the Willamette to the 135-foot-diameter and 160-foot-deep Swan Island CSO Pump Station.
When complete, the West Side CSO Tunnel will help to reduce CSOs to the Willamette River and collect, store and transport these former CSO flows to the Columbia Boulevard Wastewater Treatment Plant.
(Photo at left by S. Bednarz)
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