Lane Wins First Washington Contract with $255 Million Seattle Project

(UC) — Lane Construction said it won its first contract in the state of Washington—construction of a water storage tunnel to reduce polluted overflows into Seattle's Lake Washington Ship Canal.

(photo: Lane Construction)

The $255 million project is scheduled to start construction in December and finish in 2023, Lane said.

Sewage and stormwater from many older parts of the City of Seattle, including the Ballard, Fremont, Wallingford, and Queen Anne neighborhoods, is collected and conveyed in one set of pipes. In dry weather conditions, all sewage flows to a local wastewater treatment plant.

During wet weather conditions, polluted runoff can exceed the pipes’ capacity, resulting in an overflow of stormwater and sewage. These combined sewer overflows (CSO), contain contaminants that can make people sick and harm fish, wildlife, and the environment.  

The 2.7-mile, 18’10” internal-diameter tunnel, known as the Ship Canal Water Quality Project–Storage Tunnel project, is designed to keep more than 75 million gallons of polluted stormwater and sewage out of the Lake Washington Ship Canal, Salmon Bay, and Lake Union on average each year.

Connecticut-based Lane said it and its parent company, Salini Impregilo, are currently working on other CSO projects around the country to prevent future polluted overflows in nearby water resources including: the Northeast Boundary Tunnel (NEBT) in Washington, D.C., valued at $580 million; the Dugway Storage Tunnel in Cleveland, Ohio, valued at $153 million; and the Three Rivers Protection & Overflow Reduction Tunnel (3RPORT) in Fort Wayne, Indiana, valued at $188 million.

The company also does work in other sectors including highways, bridges, rail, metro, and mass transit. Key ongoing projects include I-10 Corridor Express Lanes in California; Unionport Bridge in Bronx, New York; and the Purple Line Light Rail Extension in Maryland.

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