Special I-90 express lane schedule during weekend SR-520 overpass demolition

I-90 express lanes over Mercer Island this weekend will be affected by the demolition of the old Evergreen Point Road overpass above State Route 520 in Medina, which requires closing the SR-520 highway and floating bridge between Seattle and Bellevue, March 9-12.

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. Alternate routes could see traffic delays midday Saturday and Sunday.

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.

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

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.

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.

Closure information and detour maps are online. 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. Express lane details are available online at:




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