Construction Activities

Construction activities

The map below shows the 2020 construction activities. This spring and summer, we will shift highway lanes to build the Montlake lid’s foundations and walls. Dates and timeframes are subject to change.

Overhead view of work zones, showing locations of construction activities.

Overhead view of work zones, showing locations of construction activities.

 Temporary on-ramp

Early 2020 to late 2021:

  • Temporary on-ramp open through late 2021

 Temporary shared-use path

Early 2020 to late 2021:

  • Temporary shared-use path open through late 2021

 Eastbound bridge

Late 2019 to mid-2022:

  • Build temporary work trestle
  • Construct temporary gantry crane
  • Remove existing eastbound bridge
  • Construct new eastbound bridge

 Lid Construction

Late 2019 to mid-2022:

  • Construct Montlake lid

 54-inch water line

Late 2019 to late 2020:

  • Construct new 54-inch water line

When we resume work, tree removal on Montlake Boulevard and the removal of the Montlake Market and 76 gas station buildings will be some of the first activities our crews complete. As we get closer to this work, you can find more information about these items and other upcoming construction activities by visiting our online Construction Corner: www.sr520construction.com/ConstructionMap.

Shifting traffic for the Montlake lid construction

Fall 2019 to Spring 2020: Build support system for the future lid

Fall 2019 shift—crews shifted traffic to make space to build the middle support wall of the future Montlake lid.

Map showing work locations from Fall 2019 through spring 2020.

Summer 2020 through early 2021: Build lid over SR 520

Summer 2020 shift—crews will shift traffic close to the central support wall of the Montlake lid, making space to build the other support walls.

Map showing work locations through early 2021.

Click image to magnify.

Early 2021 through late 2021: Remove/replace overpasses

Spring 2021 shift—crews will shift both Montlake Boulevard and 24th Avenue East onto the new Montlake lid. This will give them space to remove and reconstruct both the Montlake Boulevard and 24th Avenue East overpasses.

Map showing work locations through early to late 2021.

Click image to magnify.

Note: This is not the final traffic configuration. Work on the Montlake Project is expected to wrap up in 2023 and will require additional traffic shifts.

Closures and detours

Closures on SR 520 and local streets will usually be at night and on weekends to avoid traffic. They will be scheduled around major events whenever possible.

Sidewalk and trail closures

Sidewalk and trail closures

  • Intermittent closures and detours (as needed).
  • The 24th Avenue East bridge is closed to pedestrians and bicyclists and will reopen as part of the new Montlake lid. Detour routes are currently available along Montlake Boulevard East and on a temporary path under SR 520.
  • The Foster Point Trail and the Bill Dawson Trail connection is expected to be closed during portions of the Montlake Project.
  • Please practice social distancing and stay six feet away from other users while on the trails.

Map showing new bicycle/pedestrian detour option.

Click image to magnify.


Montlake Boulevard weekend closure

Montlake Boulevard weekend closure

  • Crews will close northbound Montlake Boulevard between East Lake Washington Boulevard and East Hamlin Street for a full weekend to relocate an underground water line. One southbound lane of Montlake Boulevard will also be closed.
  • Join our email list to receive schedule updates. Information will be shared as it becomes known.

Map showing location of upcoming Montlake closure.

Click image to magnify.

 Fully closed

 Reduced to one lane

Full SR 520 weekend closure

Full SR 520 weekend closure

  • Crews will close all lanes and ramps of SR 520 between I-5 in Seattle and 92nd Avenue Northeast in Bellevue for a full weekend to shift traffic in the work zone.
  • Join our email list to receive schedule updates. Information will be shared as it becomes known.

Map showing location of upcoming SR 520 closure.

Click image to magnify.

 Highway and ramps closed