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drains from sewer lines, built separate storm sewers in some locations, diverted surface streams away from the combined sewers, and added sumps and other devices to control surges of stormwater. These relatively low-cost efforts reduced the stormwater entering the system by more than 2 billion US gallons (7.6
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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 access shafts, connecting pipelines, and the
Portsmouth Forcemain, which carries sewage from the Swan Island Pump Station to
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system of pipes, sumps, drains, pumps, and other infrastructure that transports sewage and stormwater run-off to the city's
Columbia Boulevard Wastewater Treatment Plant. The East Side Big Pipe project, begun in 2006 and finished in 2011, was the largest of a 20-year series of projects designed to
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Costs associated with the CSO projects, which totaled about $ 1.4 billion, included $ 450 million for the East Side CSO Tunnel and $ 70 million for the
Portsmouth Forcemain. Most of the financing for the projects is coming from sewer ratepayers and almost none from state or Federal
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Over the next 20 years, the city took a series of steps to reach its goals: a 99 percent reduction in CSOs into the
Columbia Slough by the year 2000 and a 94 percent reduction in CSOs into the river by December 2011. As first steps, the city helped property owners disconnect their roof
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Work on the East Side Big Pipe began in 2006 and was completed in late 2011. Its tunnel is almost 6 miles (9.7 km) long. It lies at an average of 150 feet (46 m) below the surface along the east bank of the
Willamette River from the intersection of Southeast 17th Avenue and McLoughlin
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From the mid-19th century until the mid-20th century, Portland's combined sewer system poured untreated sewage into the
Willamette River and the Columbia Slough. In 1952, the city built its first plant to treat wastewater, which included stormwater run-off as well as raw sewage. However, the
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The route parallels the east side of the
Willamette River mostly within a few blocks. Six vertical shafts were built to manage and facilitate tunnel construction. These are listed in reverse flow direction, or North to South.
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By 2000, the city completed a more complicated project, the 3.5-mile (5.6 km) Columbia Slough
Consolidation Conduit. A separate project completed in 2006 centered on construction of the 3.5-mile (5.6 km)
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existing sewer pipes were often overwhelmed by surges of stormwater from big storms, and the resulting CSOs continued to pollute the river and the slough. In 1991, the city signed an agreement with the
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and the Swan Island Pump
Station. By late 2011, the city finished the largest of the CSO projects, the East Side Big Pipe. The combined projects were completed on schedule and met the intended goals.
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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
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The Portsmouth Forcemain, 3 miles (4.8 km) long and 66 inches (170 cm) in diameter, runs north from the pump station across Swan Island and under
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and North Willamette Boulevard. There it meets the pre-existing Portsmouth Tunnel, which conveys combined sewage by gravity to the treatment plant.
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Looking down the main construction shaft to the East Side Big Pipe during construction
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640:"Combined Sewer Overflow CSO Abatement Program: Final Report, 1991–2011"
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103:. The pipe in the tunnel has an inside diameter of 22 feet (6.7 m).
535:"Sewer Repair Portland OR - Trenchless Sewer Line & Drain Cleaning"
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nearly eliminate combined sewer overflows (CSO)s into the
642:. Portland Bureau of Environmental Services. January 2012
111:the Columbia Boulevard Wastewater Treatment Plant.
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670:Sewerage infrastructure in the United States
665:Buildings and structures in Portland, Oregon
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576:. Portland Bureau of Environmental Services
64:Oregon Department of Environmental Quality
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94:East Side Big Pipe under construction
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28:is a large sewer line and tunnel in
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66:to nearly eliminate these CSOs.
594:"Final Report", pp. 18–20
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603:"Final Report, pp. 26–27
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680:2011 establishments in Oregon
524:"Final Report", pp. 4–5
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574:"East Side Big Pipe Project"
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167:GPX (secondary coordinates)
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690:Southeast Portland, Oregon
685:Northeast Portland, Oregon
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162:GPX (primary coordinates)
137:Map all coordinates using
145:Download coordinates as:
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614:"East Side CSO Shafts"
486:45.48651°N 122.64755°W
440:45.50271°N 122.66139°W
394:45.50619°N 122.66278°W
348:45.51773°N 122.66250°W
302:45.52936°N 122.66649°W
256:45.53670°N 122.67524°W
210:45.55302°N 122.69564°W
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157:GPX (all coordinates)
108:tunnel boring machine
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560:"Final Report", p. 6
491:45.48651; -122.64755
445:45.50271; -122.66139
399:45.50619; -122.66278
353:45.51773; -122.66250
307:45.52936; -122.66649
261:45.53670; -122.67524
215:45.55302; -122.69564
80:West Side CSO Tunnel
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616:. City of Portland
313:Steel Bridge shaft
280:Steel Bridge shaft
267:River Street shaft
234:River Street shaft
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40:. It is part of a
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675:Tunnels in Oregon
539:NWHomeServicesLLC
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221:Port Center shaft
188:Port Center shaft
86:Technical details
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633:Works cited
620:October 15,
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476:122°38′51″W
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430:122°39′41″W
405:Opera shaft
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384:122°39′46″W
372:Opera shaft
359:Alder Shaft
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338:122°39′45″W
326:Alder Shaft
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292:122°39′59″W
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246:122°40′31″W
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200:122°41′44″W
183:Coordinate
101:Swan Island
659:Categories
646:August 28,
580:August 28,
544:2022-09-16
512:References
495: (
473:45°29′11″N
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427:45°30′10″N
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381:45°30′22″N
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311: (
289:45°31′46″N
265: (
243:45°32′12″N
219: (
197:45°33′11″N
116:Waud Bluff
74:) a year.
34:U.S. state
49:and the
30:Portland
57:History
32:in the
38:Oregon
126:Route
648:2013
622:2013
582:2013
24:The
152:KML
36:of
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
