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Overpass demolition to close SR 520 bridge, highway

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Date:  Tuesday, March 06, 2012

Contact: Jeff Switzer , WSDOT SR 520 Communications, 206-770-3547 (Seattle) or 206-819-7230 (cell)

March 9-12 crews will remove old Evergreen Point Road overpass in Medina

SEATTLE – Demolition crews are gearing up to take down the old Evergreen Point Road overpass above State Route 520 in Medina, which requires closing the highway and floating bridge between Seattle and Bellevue this weekend.

During the closure, drivers will have to find another way across or around Lake Washington from 11 p.m. Friday, March 9, until 5 a.m. Monday, March 12. All lanes and ramps will be closed between Montlake Boulevard in Seattle and Interstate 405 in Bellevue. Alternate routes could see traffic delays midday Saturday and Sunday.

Crews will be working quickly and carefully through the weekend to demolish the old overpass, said Brian Dobbins, construction engineer for the Washington State Department of Transportation’s SR 520 Eastside Transit and HOV Project.

“The construction zone will be a hive of activity with heavy machinery and huge dump trucks buzzing back and forth, as we break apart and haul out this old overpass,” Dobbins said.

The narrow two-lane overpass was built in 1962 to carry local Medina traffic over SR 520. Crews estimate they will stockpile and later haul up to 50 dump trucks of concrete overpass debris to the Cadman recycling yard in Redmond.

During this weekend’s construction about 100 construction workers will focus on demolition and other highway work. Once the Medina overpass is gone, crews will shift gears to build new concrete supports for the new Evergreen Point Road lidded overpass, which will be completed during the next 18 months in coming months.

Last week crews closed the old Evergreen Point Road overpass and shifted traffic onto a portion of the new lidded overpass – a move that keeps traffic flowing while demolition and construction continues.

Forty-eight huge concrete girders already are in place for the new lidded overpass with another 34 girders to be added in coming months. When complete the new overpass will measure 485 feet wide and include transit access, a park-and-ride lot and paths and open space to help reconnect the community, Dobbins said.

SR 520 closure details at a glance

  • Mainline SR 520 and all connected ramps between Montlake Boulevard in Seattle and I-405 in Bellevue will be closed from 11 p.m. Friday, March 9, to 5 a.m. Monday, March 12.
  • 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.

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 maintain traffic flow.

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 Saturday, March 10, and Sunday, March 11
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 the 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 is widening 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-passable culverts. 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-Bellevue corridor is scheduled to open to traffic in December 2013.

Tools for drivers
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Follow WSDOT on Twitter: @wsdot and @wsdot_traffic for Puget Sound traffic.
Call 511 for traffic updates.
Tune to highway advisory radio and watch electronic highway signs for information.
More information about the SR 520 Eastside project is online at

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