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SR 520 - Floating Bridge and Landings Project: 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 and traffic began traveling on the bridge in April 2016, when the new floating bridge opened to traffic.

View construction photos on Flickr.

Overview of construction activities

Contractor quick facts

Contractor: Mowat American Joint Venture

Contract amount: $22.1 million

Construction began on Lake Washington: Summer 2013

Project completed: Sept. 2014

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 opened for traffic at the same time as the new floating bridge, in April 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 and the future West Approach Bridge North (WABN) that connects the floating bridge to the Montlake area.

Construction of the north half of the new west approach bridge launched in September 2014. The south half is part of the $1.64 billion “Rest of the West” portion, which is ramping up to final design and future construction.

The west connection bridge connects the new floating bridge to the approach bridge

How can I get more information?


24-hour construction hotline: 206-708-4657

Twitter: @WSDOT_520

Mail: SR 520 Bridge Replacement and HOV Program
999 3rd Avenue, Suite 2200
Seattle, WA 98104