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The East Side tunnel was the largest sewer construction project ever undertaken by the City of Portland. A contractor, Kiewit-Bilfinger Berger (KBB), used a tunnel boring machine that was 300 feet (91 m) long and had a cutting head that was 25 feet (7.6 m) in diameter. In addition to the tunnel and the pipe, the project involved building seven ...
It receives and stores overflow from the combined sewer system before it can reach the Willamette River. The main tunnel is 14 feet (4.3 m) in diameter and 3.5 miles (5.6 km) long for a capacity of 2,850,000 cubic feet (81,000 m 3) and connects to dozens of smaller sewer overflow interceptors along the west side of the Willamette River.
The wastewater is collected by a vast network of more than 800 miles (1,300 km) of sewer lines and 39 pump stations and routed to one of four treatment plants—Durham, Rock Creek, Hillsboro and Forest Grove. Ten percent of the wastewater treated by Clean Water Services is used for irrigation and in area wetlands during the summer months. [14]
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A 1991 agreement between the City of Portland and the State of Oregon to dramatically reduce combined sewer overflows (CSOs) [81] led to Portland's Big Pipe Project. The project, part of a related series of Portland CSO projects completed in late 2011 at a cost of $1.44 billion, [ 82 ] separates the city's sanitary sewer lines from storm-water ...
The Portland Water Bureau is the municipal water department for the city of Portland in the U.S. state of Oregon.The bureau manages a water supply that comes mainly from the Bull Run River in the foothills of the Cascade Range east of the city and secondarily from the Columbia South Shore Well Field near the Columbia River.