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Overpass demolition, girder setting to close SR 520 bridge June 1-4

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Date:  Tuesday, May 29, 2012

Contact: Jeff Switzer , WSDOT SR 520 Communications, 206-770-3547 (Seattle)

Overnight closure of westbound SR 520 on May 30

SEATTLE – Another major overpass above State Route 520 on the Eastside will be demolished this weekend, making way for highway improvements and a new lidded overpass at 92nd Avenue Northeast.

Demolition crews will close the SR 520 floating bridge and highway between Seattle and Bellevue at 11 p.m. Friday, June 1. The weekend of work also includes installing the final 34 girders needed for the new Evergreen Point Road lidded overpass in Medina.

Crews also will close westbound SR 520 overnight Wednesday, May 30, for overhead utility work.

The work is part of a project to widen the highway to six lanes on the Eastside, add transit stops in the median and improve neighborhood connections across SR 520. Through the weekend, all SR 520 lanes and ramps will be closed between Montlake Boulevard in Seattle and Interstate 405 in Bellevue. Drivers will have to find another way across or around Lake Washington until SR 520 reopens at 5 a.m. Monday, June 4.

“Crews are on a tight schedule this weekend,” said Brian Dobbins, construction manager for the Washington State Department of Transportation’s SR 520 Eastside Transit and HOV Project. “Demolition crews have to remove the last piece of the old Evergreen Point overpass as quickly as they can so a huge crane can start placing girders. Some of those girders weigh 106 tons apiece and crews will be focused on placing them precisely.”

Crews will also install about 1,500 feet of new drain pipes underneath the highway lanes, Dobbins said. During the weekend closure, approximately 150 construction workers will help with demolition, girder installation, drain pipe installation and other critical work in the corridor.

SR 520 closure details at a glance

  • Wednesday, May 30: Westbound SR 520 and all ramps between 92nd Avenue Northeast in Clyde Hill and Montlake Boulevard in Seattle will close overnight from 11 p.m. Wednesday, to 5 a.m. Thursday. Crews will install utility pipes and conduit beneath the new 84th Avenue Northeast lidded overpass.
  • Friday, June 1 to Monday, June 4: Mainline SR 520 and all connected ramps between Montlake Boulevard in Seattle and I-405 in Bellevue will be closed all weekend, from 11 p.m. Friday, June 1, to 5 a.m. Monday, June 4. The 108th Avenue Northeast on-ramp to eastbound SR 520 will remain open to traffic. Two sections of SR 520 will remain open to traffic: I-5 to Montlake Boulevard and areas east of I-405.

Closure information and detour maps are online. Night work is planned, so residents near the work zone likely will hear construction noise. Weekend closure details are available at

Special I-90 express lane operations June 2 and 3

While SR 520 is closed for the weekend, traffic is expected to be heavy midday Saturday and Sunday on I-5 and I-90 heading into Seattle and on I-405 approaching I-90. The express lane schedules will change this weekend on I-90 to help maintain traffic flow.

  • The I-90 express lanes will be open westbound from 6 a.m. to 2 p.m. and eastbound after 3 p.m. both days this weekend.

The typical express lane schedule is posted online, as well as this weekend’s altered schedule. Key alternate routes for drivers heading to Seattle from south King County include State Routes 509 and 599, East Marginal Way South, Airport Way South and Fourth Avenue South. Express lane details are available online at

SR 520 Eastside project overview

The Eastside Transit and HOV Project widens SR 520 to six lanes between Medina and Bellevue. Crews are rebuilding interchanges, constructing highway lids and bus stops in the center of the highway and installing fish-friendly culverts. In 2010, WSDOT awarded a $306 million design-build contract to Eastside Corridor Constructors, a joint venture of Granite Construction Company and PCL Construction Services.
Full closures of SR 520 for construction are limited during the next two years. The completed Medina to Bellevue corridor is scheduled to open to traffic in December 2013.

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