In this update:

• Big milestone reached for the Portage Bay Bridge and Roanoke Lid Project
• Plan ahead! SR 520 and trail fully closing across Lake Washington weekend of Feb. 10
• Final girder placement for the Montlake lid marks another milestone
• Montlake Project online monthly meeting
• Construction Corner roundup

Big milestone reached for the Portage Bay Bridge and Roanoke Lid Project

The project team took another significant step forward this week by releasing the Request for Proposals (RFP) to three contractor firms for the Portage Bay Bridge and Roanoke Lid Project. The teams selected to submit proposals are:

• American Bridge/Aecon, Joint Venture
• Skanska USA Civil West
• Kiewit/Stacy and Witbeck, A Joint Venture

The release of the RFP marks the three selected teams’ first opportunity to review preliminary design and contract requirements as they prepare their proposals and cost estimates to design and build the project.

Proposals from each of the design-build teams are due in August. Their proposals will detail the teams’ approach for completing the bridge and highway lid’s final design and construction. This includes their planned means and methods for constructing the project. WSDOT will announce the selected contractor in late summer or early fall.

The Portage Bay Bridge and Roanoke Lid Project is WSDOT’s last funded project for rebuilding the SR 520 corridor. Releasing the RFP is another milestone in the state’s efforts to complete safety and mobility enhancements on SR 520 between Redmond and Seattle. Major Portage Bay construction is set to begin in 2024 and will last approximately six years. Project benefits include:

• Safer travel from replacement of the old, structurally vulnerable Portage Bay Bridge with two parallel, seismically stronger bridges.
• Improved regional mobility with completion of the SR 520 Program’s transit & HOV enhancements between Redmond and Seattle.
• Greater transportation options through an extension of the regional SR 520 Trail across Portage Bay, a new bicycle and pedestrian crossing over I-5, and connections to the city of Seattle’s nonmotorized trail networks.
• A community-connecting highway lid between 10th Avenue East and Delmar Drive East, with landscaped open space.
• Improved water quality from a new system for capturing and treating SR 520 stormwater runoff.
• Wider highway shoulders that allow disabled vehicles to pull over without blocking traffic.

More information about the RFP can be found on WSDOT’s Contract Ad & Award webpage.

For more information about the project, visit our main project page or the Upcoming Construction Projects page on our Construction Corner site.

What’s that boat doing in Portage Bay?

Neighbors near Portage Bay may have noticed a boat moving back and forth across the bay yesterday. Crews were conducting a survey to measure the bay’s depth and map its underwater features. The data will ensure that the three contract proposers for the upcoming Portage Bay project (see the update above) have the most up-to-date information about the bay. The last survey was completed in 2019. The selected contractor will be required to complete additional bathymetric surveys both before construction begins and after the project is complete.

Plan ahead! SR 520 and trail fully closing across Lake Washington weekend of Feb. 10

Final girder placement for the Montlake lid marks another milestone

Thanks for your patience as we reached another major milestone during last weekend’s closure of SR 520 when we placed the last of the 208 girders needed for the Montlake lid. Construction of the lid began in January 2021. The Montlake Project’s final girders – beams to support a future bike and pedestrian bridge over the highway, east of the lid – are expected to be placed by spring 2023.

Curious about what the Montlake lid will look like after it’s done? Check out this video on the SR 520 Program’s YouTube channel!

Crews wrap up girder setting for the Montlake Lid.

Montlake Project online monthly meeting

Big thanks to our neighbors who attended our in-person Montlake meeting on Jan. 11! The next meeting will be held virtually on Feb. 15. Come learn about upcoming construction activity and future highway closures as we extend the Montlake lid and build a bicycle and pedestrian bridge over SR 520 east of the lid. Register to attend and take part in a Q&A.

Date/Time: Wednesday, Feb. 15 at 12:30 p.m.

Register: https://bit.ly/Feb15-SR520-meeting-registration

Looking west at the construction of a highway lid over SR 520 in Seattle’s Montlake neighborhood.

Construction Corner roundup

• Feb. 3-6: Mercer Street on-ramp to northbound I-5 and express lanes closing
• Feb. 10-13: SR 520 and SR 520 Trail fully closed across Lake Washington
• Ongoing: Montlake Boulevard on-ramp to eastbound SR 520 closed weeknights

Check out the SR 520 Construction Corner map for the most up-to-date information on closures and construction impacts.

How to reach us and stay informed about SR 520 construction:

• Call or text our project-specific construction hotlines with pressing questions or concerns related to the:
  • Montlake Project: 206-775-8885
  • SR 520/I-5 Connection Project: 206-316-2559 
• Call the SR 520 Program information line (206-770-3554, M-F 8 a.m. - 5 p.m.) with general SR 520 inquiries.
• Email SR 520 staff with your questions about the project or construction activities.
• Visit the SR 520 Construction Corner for the most up-to-date information on closures and construction impacts.
• Visit the SR 520 Program website to find general information about the project.
• Follow us on Twitter @wsdot_520 to get key news and updates about the SR 520 program.
• View current Montlake Project construction photos, taken continuously day and night, by mounted construction cameras
• Share the ROTW listserv with your friends and neighbors

If you have difficulty understanding English, you may request language assistance services free of charge by calling (360) 705-7090 or emailing TitleVI@WSDOT.WA.GOV.

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