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SR 520 - Montlake Phase

The next phase of construction for the SR 520 Program is the Montlake Phase. This is the first stage of construction for the Rest of the West, and will build a new Montlake interchange, lid and land bridge, as well as the new West Approach Bridge South structure. This phase is currently in the contractor-procurement stage. We anticipate hiring a contractor in 2017 and launching construction in 2018.

Missed the Nov. 16 Voluntary Submitters Meeting? Materials available online 

WSDOT hosted a Voluntary Submitters Meeting for interested contractors regarding the SR 520 Montlake Phase on Nov. 16 in Seattle. Meeting materials are now available online. Click here for additional information.

Managing the effects of construction

We are working to develop community-based plans to manage neighborhood traffic and minimize the impacts of construction in the project area. The first of these plans is the draft SR 520 Montlake Phase Neighborhood Traffic Management Plan.

Read the draft report
The draft Neighborhood Traffic Management Plan (pdf 7.6 mb) is online for you to read and learn about potential traffic management measures and solutions being considered. Also online are the display boards (pdf 2.8 mb) and presentation slides (pdf 1.8 mb) from our March public meeting on this topic. You also can review the public comments (pdf 1.2mb) we received on the draft report.

Design renderings

Conceptual image of the Montlake lid transit station.

Conceptual image of a bicycle-pedestrian land bridge over SR 520.

Montlake Phase timeline and next steps

• 2017: Hire design-build contractor
• 2017-18: Conduct preconstruction outreach
• 2018: Launch construction activities
• 2022-23: Complete the Montlake Phase 

Note: There will be additional design work for future project phases, such as the Portage Bay Phase, with additional opportunities for public comment.

Major milestones for the remaining phases of the project are:
1. Advance conceptual design
2. Hire a contractor
3. Preconstruction outreach
4. Construction
5. Completion

Rebuilding the corridor in stages

map phased opening of new lanes in Seattle
View a map of phased lane openings in Seattle. (pdf 1 mb)

How to stay involved

We know there is interest in staying informed about this upcoming work. Here are some resources you can use:

• Email:
• Phone: 206-770-3554 (M-F, 8 to 5)
• Email updates: Subscribe
• Twitter: @wsdot_520

If your organization is interested in receiving a project briefing or presentation, please contact us.

A commitment to fair contracting

WSDOT is committed to meeting the governor's voluntary goal of providing 26 percent of the contract value for Connecting Washington transportation projects -- including the Montlake Phase of SR 520 construction -- to minority-owned, women-owned, veteran-owned and disadvantaged small businesses. Learn more about the SR 520 Diversity Program.