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.
Overview of construction activities
Contractor quick facts
Contractor: Mowat American Joint Venture
Contract amount: $22.1 million
Construction began on Lake Washington: Summer 2013
Contract date for project completion: Late summer 2014
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 will be opened for traffic at the same time as the new floating bridge, scheduled for spring 2016.
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.
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.
Step 1 - Floating bridge: Work on the new floating bridge is currently underway on Lake Washington.
Step 2 - West connection bridge: Complete!
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.
How can I get more information?
24-hour construction hotline: 206-708-4657
Infoline: 1-888-520-NEWS (6397)
Mail: I-5 to Medina: Bridge Replacement and HOV Project
SR 520 Bridge Replacement and HOV Program
999 3rd Avenue, Suite 2200
Seattle, WA 98104