Willamette River Combined Sewer Overflow
Location: Portland, Oregon
Owners: City of Portland, Bureau of Environmental Services
Market: Wastewater
Construction Cost—
West Side: $305 Million (Approximate)
East Side: $464 Million (Estimated)
Construction Start/End—
West Side: 2001/2006
East Side: 2005/2011 (Estimated)
Jacobs Associates’ Role: Construction Management and Support of Excavation Design
Portland's grand plan to reduce the volume and frequency of combined sewer overflows (CSOs) into the Willamette River involves two big projects - the West Side CSO and the East Side CSO. Each project calls for building a tunnel paralleling each side of the river. These tunnels will function as conveyance and storage conduits, intercepting existing CSO outfalls, and conveying flows to a new pump station and force main for eventual treatment. Together, the West Side CSO and East Side CSO will capture more than 94 percent of the bacteria- and pollutant-laden sewage and storm water that previously overflowed into the Willamette River when it rained. These CSO projects will help the City of Portland meet environmental standards imposed by the State of Oregon.
|
