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SR 520 - West Approach Bridge North Project Construction Plans

What can I expect during construction?

As the West Approach Bridge North project moves forward, WSDOT is committed to construction management practices that avoid, minimize, and mitigate the effects of WABN construction activities on neighbors, communities and the traveling public.

WSDOT will employ construction techniques that minimize construction effects, for example:

  • Keep SR 520 open to traffic during construction with limited weekend and evening closures in coordination with other projects
  • Build the west approach structure using work bridges and limited barge work in order to limit truck traffic on local streets
  • Restrict nighttime construction work to reduce noise effects
  • Evaluate ways to buffer and screen adjacent communities from construction activities

A worker tying rebar


How will WSDOT build the West Approach Bridge North project?

WSDOT plans to construct the West Approach Bridge North in three stages, beginning in summer 2014 with an anticipated completion date of fall 2016. 

Click each image below to open in a larger PDF of each phase.

Prepare: Early construction activities (Approx. 4-6 months)

  • Install work bridges 
  • Make local street improvements on 24th Avenue East and Lake Washington Boulevard
  • Implement temporary street restrictions and detours on 24th Ave East and Lake Washington Boulevard for drivers and bicyclists/pedestrians in the Montlake area




Build: Primary construction activities (Approx. 20-24 months)

  • Complete work bridge installation
  • Demolish the westbound Lake Washington Boulevard
    off-ramp and unused R.H. Thomson ramps
  • Build the West Approach Bridge North structure
  • Build the new stormwater facility in Montlake




Connect: Final WABN construction activities (Approx. 2-3 months)

  • Remove work bridges
  • Connect the new West Approach Bridge North to the
    new floating bridge and Montlake interchange
  • Restripe existing structure for eastbound traffic
  • Open to traffic


How can I get involved and find out more?

WSDOT has developed a WABN Community Construction Management Plan (CCMP) with local communities that outlines best practices and communication tools to minimize construction effects. For example, the CCMP helps to identify opportunities to implement measures such as noise buffers and screening, where appropriate, for the duration of construction.

We encourage you to check out the document to learn more!