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SR 520 - West Approach Bridge North Project Transportation

How will I drive around the Montlake area when the West Approach Bridge North is complete?

When the West Approach Bridge North project is complete, traffic access in the Montlake area will be similar to today. The key difference in traffic flow is that the westbound Arboretum off-ramp will be removed, and its function replaced by a new off-ramp at 24th Avenue East (indicated by the green line below).

Key local traffic routes in the Montlake area are shown below. Click the graphic to open as a larger PDF (1.12 mb).



Will the West Approach Bridge North affect traffic volumes in Montlake?

When the West Approach Bridge North project is complete, overall traffic volumes are not expected to significantly increase in Montlake. As shown below, travel volumes will be approximately the same after this phase is operational as they are under current conditions. Click the graphic to open as a larger PDF (5.94 mb).

Traffic volumes in the Montlake area before and after the WABN project is completed


How will WSDOT protect local communities from traffic?

In order to protect local communities from traffic, WSDOT will:

  • Add capacity to the Montlake interchange with an additional westbound lane of storage on Lake Washington Boulevard between 24th Avenue and Montlake Boulevard.
  • Clearly mark “local access only” routes to discourage traffic from traveling into local neighborhoods.
  • Coordinate with the City of Seattle on neighborhood traffic management strategies.
  • Check out the Neighborhood Traffic Management Plan for additional details and information. This plan is a living document that will be updated as future phases of the I‐5 to Medina project are funded and implemented.

How will the West Approach Bridge North improve transit, bicycle, pedestrian and open-space connections in Montlake?

Local transit service will be similar to today, and we have worked closely with local transit agencies to ensure continued service during construction.

Other project features that will improve connections in the Montlake area:

  • Continued Montlake flyer stop service in both directions
  • Regional bicycle/pedestrian path extended from the new floating bridge to Montlake and connecting to local network
  • New public park space near the University of Washington campus
  • Stormwater facility open to the public and designed to interface with adjacent park areas
  • Improved Arboretum Multi-Use Trail connecting East Madison Street to the Montlake and University of Washington areas
  • The Montlake Triangle Project, funded in part as a result of this project, will implement a new bicycle/pedestrian facility connecting the regional shared use path to the Burke-Gilman Trail