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SR 520 - West Approach Bridge North Project: What's Happening Now?

Updated: Feb. 12, 2018

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Project photos

See more photos of SR 520 construction
on our Flickr site .

Project overview

The West Approach Bridge North (WABN) project is nearing completion. Work hours may vary depending on the construction activity. Construction crews will continue to employ best management practices throughout construction to minimize impacts on the community and environment. Below you’ll find a summary of upcoming construction activities planned for the next few weeks. Please be aware that due to the dynamic nature of construction activities, construction plans are subject to change. 

Project milestones

SR 520 Trail
The SR 520 bicycle and pedestrian trail is now open across Lake Washington!


Construction activities under a city of Seattle temporary noise variance

  • Crews are currently operating under a city of Seattle temporary noise variance, permit number 3031027. The permit is active from Monday, Feb. 12, to Monday, Feb. 26. The current work requires highway and street closures that can occur only at night. This work involves installing joint seals on westbound SR 520, removing debris from catch basins on the highway, and installing a water line across Lake Washington Boulevard.

Construction activities


SR 520/local road closures

Crews plan to close Lake Washington Boulevard between East Roanoke Street and East Miller Street on Tuesday and Wednesday nights, Feb. 20-21.  The closures will begin at 7 p.m. each night and end at 6 a.m. each morning. Lake Washington Boulevard will be restricted to local traffic during this time. Through drivers should detour through 24th Avenue Northeast. This work is tentative. Crews will use this time to install a water line underneath Lake Washington Boulevard. Find full details on our Orange Page.

Arboretum Waterfront Trail closures

The Arboretum Waterfront Trail is open.

Construction activities near the MOHAI and Old Canal Reserve staging areas

Activities in the next few weeks (February 2018)

Crews are wrapping up work on the WABN project over the next few weeks. We do not anticipate that any of this work will affect project neighbors. For the most up-to-date information on construction activities and traffic effects, please visit our Orange Page.


24th Avenue East overpass now open to bicyclists and pedestrians 

The 24th Avenue East Bridge opened in December 2017, restoring the previous Lake Washington Loop connection across SR 520. There is no longer a need for the bicycle/pedestrian detour on Montlake Boulevard.

Please be aware that the contractor for the next phase of construction, scheduled to start in late 2018, may need to restrict bicycle/pedestrian access to the 24th Avenue East overpass, depending on staging of work and safety considerations.

Map shows the Montlake neighborhood. The SR 520 Trail is highlighted in purple. Other regional trails are also highlighted in different colors.

City of Seattle temporary noise variances

When needed, a temporary noise variance can be granted to Flatiron by the city of Seattle to allow the contractor to conduct noisier work outside the typical hours of construction.

  • The city's noise ordinance allows for variances for louder nighttime work between 10 p.m. and 7 a.m. on weekdays and 10 p.m. and 9 a.m. on weekends.
  • Use of noisy impact equipment, like jackhammers, will occur before 5 p.m. as required by the temporary noise variance.
  • WSDOT inspectors will monitor nighttime activities to be sure work complies with city of Seattle requirements.

Watercraft restrictions

For boater information, please visit our SR 520 Boater webpage.


Tree protection and removal

To make way for a temporary work bridge and staging areas, crews removed trees as necessary on Foster Island and in the Montlake area. WSDOT worked with the city of Seattle to remove as few trees as possible, and will continue to mark trees for protection with orange fencing and will coordinate on replacement plantings.