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SR 520 Bridge Program: West Connection Bridge

West Connection Bridge project area

The West Connection Bridge is a 1,330-foot-long interim bridge structure that joins the new SR 520 floating bridge to the existing SR 520 roadway.

Construction of the West Connection Bridge was completed in September 2014. Traffic will travel on the bridge in spring 2016, when the new floating bridge opens to traffic.

View construction photos on Flickr.

You can also learn more about potential construction effects in the West Connection Bridge Community Construction Management Plan (pdf 1.9 mb).

Overview of construction activities

Work activities for the new West Connection Bridge included:

  • Building new support columns
  • Widening the existing roadway
  • Building a new connecting roadway

Construction for the West Connection Bridge began in summer 2013 and was completed in September 2014. The West Connection Bridge will be opened for traffic at the same time as the new floating bridge, scheduled for spring 2016.

Overview of the West Connection Bridge

An overview of West Connection Bridge construction elements and activities. View enlarged as a PDF (pdf 2.5 mb)

Construction timing with other SR 520 projects

The construction schedule for the west connection bridge was carefully timed to coincide with activities for both the new floating bridge, currently under construction, and the future West Approach Bridge North (WABN) that connects the floating bridge to the Montlake area.

The north half of the new west approach bridge is fully funded for construction, which began in September 2014; the south half is among $1.4 billion in unfunded SR 520 corridor projects.

Step 1 - Floating bridge: Work on the new floating bridge is currently underway on Lake Washington.

Step 1 - Floating bridge: Work on the new floating bridge is already under way on Lake Washington.

Step 2 - West connection bridge: Complete!

Step 2 - West connection bridge: In 2013, we began building a structure that will connect the new floating bridge to the existing west approach bridge.

Step 3 - West approach bridge north: We began construction on the West Approach Bridge North (WABN) in September 2014. When WABN is complete, westbound traffic will travel on the new structure while eastbound traffic will travel on the existing west approach and the west connection bridge.

Step 3 - West approach bridge north: Starting in summer 2014, we will start work on the West Approach Bridge North (WABN).


How can I get more information?

E-mail: SR520bridge@wsdot.wa.gov

24-hour construction hotline: 206-708-4657

Infoline: 1-888-520-NEWS (6397)

Twitter: @WSDOT_520

Mail: I-5 to Medina: Bridge Replacement and HOV Project
SR 520 Bridge Replacement and HOV Program
999 3rd Avenue, Suite 900
Seattle, WA 98104