Westbound SR 520 bridge and highway to close tonight

Washington State Department of Transportation - file art
Washington State Department of Transportation
— image credit: file art

State Route 520 drivers and transit riders should plan ahead for an overnight closure of all westbound lanes of the floating bridge and highway as construction crews continue building foundations for the new west-end bridge.

Crews will close all westbound lanes of SR 520 between 92nd Avenue Northeast and Montlake Boulevard from 11 p.m. Thursday, Aug. 29 to 5 a.m. Friday, Aug. 30.

A single westbound lane will close at 9 p.m. and reopen at 6 a.m.

During the closure, crews will build concrete column foundations for the new SR 520 West Connection Bridge.

Working from the existing SR 520 roadway, crews will pump more than 25 truckloads of concrete from trucks parked on the highway into a large column shaft drilled 95 feet beneath Lake Washington.

Additional closures of westbound SR 520 are planned in September:

  • 11 p.m. Friday, Sept. 6 to 5 p.m. Saturday, Sept. 7
  • 9 p.m. Saturday, Sept. 14 to 9 a.m. Sunday, Sept. 15


SR 520 West Connection Bridge Project overview

Contractor Mowat-American A Joint Venture is building a 1,330-foot-long, four-lane structure parallel to and north of the current bridge. This key link will allow travelers from the new SR 520 floating bridge to connect to the existing west-side structure while the remainder of the corridor is being replaced in Seattle.

WSDOT awarded the contract for the West Connection Bridge Project in April. Mowat-American’s $22,129,243 bid was lowest among four firms that competed for the job. Construction is scheduled for completion in late summer 2014.

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