SR 513 - Montlake Bridge - Mechanical Rehab, Deck Replacement & Joint Repair

Project news

  • This project was advertised for competitive bidding on April 5, 2021.
  • Construction will begin in the summer of 2021.
  • Sign up to receive email updates about this project and other King County topics.
  • Check our Flickr page for detour maps and progress photos.


In 2021, contractor crews working for WSDOT will replace the more than 20-year-old worn grid deck on the Montlake Bridge. They will also make expansion joint and mechanical repairs so the movable span can continue to operate reliably and meet the growing multimodal traffic demands of northeast Seattle.

Needs & benefits

Prior to the COVID-19 pandemic, an average 40,000 to 66,000 drivers used the State Route 513 Montlake Bridge in Seattle every day. Seattle’s population has grown by more than 140,000 people in the past 10 years, and projections show no signs of it slowing down in the decade ahead. This preservation project will keep the bridge in a state of good repair as it continues to support the needs of a growing population.

What travelers need to know

This work requires multiple closures of the bridge, some for extended periods of time. Closures are required for, but not limited to, the replacement of the grid deck panels and expansion joints, and mechanical repairs. These two phases of work cannot be combined because the bridge must be in the raised position during the mechanical repairs. Crews will need access to the workspace under the bridge, between the bottom of the roadway and the mechanical apparatuses that move the span, to complete this work.

August closure

The first phase of the project will replace the metal grid deck and two expansion joints on the Montlake Bridge. This work requires a 26-day continuous around-the-clock closure to vehicle traffic. This phase is slated to begin after Seafair weekend (Aug. 9) and finish up prior to Labor Day weekend (Sept. 3). The pedestrian and bicycle pathways over the bridge will remain open. Boat access in the Montlake Cut below the bridge will be maintained. WSDOT is working with the United States Coast Guard to determine the best way to coordinate bridge openings during construction.

Fall weekend closures

The second phase of work will repair and replace mechanical components that raise and lower the bridge. During this phase of work, the bridge must be in the raised position. Access to vehicles, pedestrians and bicyclists will be restricted during working weekends. Boats will be able to access the Montlake Cut below the bridge.


  • April 2021: Advertised for competitive bidding.
  • Summer 2021: Construction scheduled to begin.
  • Fall 2021: Construction scheduled to be complete.


Financial Data for PIN 151301B, 151301C, 151312B
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $7,378
CWA $0
Total $7,378


Joseph Calabro
WSDOT Communications

Montlake Bridge closure and detour thumbnail