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SR 520 - Timeline

There are four main projects in the SR 520 Bridge Replacement and HOV Program. Each has its own design and environmental process(es). One of the four projects, the I-5 to Medina: Bridge Replacement and HOV Project, contains subprojects that include replacement of the SR 520 floating bridge and upgrades to SR 520 infrastructure in Seattle between I-5 and Lake Washington.

Click to jump to timelines:
I-5 to Medina: Bridge Replacement and HOV Project
Medina to SR 202: Eastside Transit and HOV Project
Pontoon Construction Project
Lake Washington Congestion Management Project

Program map of lane configuration
Click image for larger, printable version (pdf 640 kb)

I-5 to Medina: Bridge Replacement and HOV Project

Floating Bridge and Landings Project

  • 2012 - Began construction of pontoons in Tacoma.
  • 2012 - Began construction of new floating bridge.
  • 2016 - Opened new floating bridge to traffic.

West Connection Bridge Project

  • 2013 - Began construction of new bridge.
  • 2014 - Completed construction of bridge.

West Approach Bridge North Project

  • 2014 - Began construction of new bridge.
  • 2017 - Anticipated completion of new bridge.

I-5 to Lake Washington Project: the Rest of the West 

  • 2015 - Receives full funding from Legislature.
  • 2018 - Anticipated start of construction on first phase of project. 
     

Medina to SR 202: Eastside Transit and HOV Project

  • 2008 - Conducted environmental scoping.
  • 2009 - Issued environmental assessment .
  • 2010 - Completed environmental process.
  • 2010 - Received permits.
  • 2011 - Began construction.
  • 2014 - Completed major corridor improvements. 
  • 2015 - Completed all construction.

Pontoon Construction Project

  • 2010 - Published draft environmental impact statement.
  • 2010 - Completed innovative pontoon construction testing effort.
  • 2010 - Issued final environmental impact statement.
  • 2011 - Received Record of Decision from FHWA.
  • 2011 - Began pontoon construction in Grays Harbor.
  • 2015 - Completed pontoon construction.  

Lake Washington Congestion Management Project