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SR 520 - West Approach Bridge North Project

Project Status: Design
Location map of West Approach Bridge North project
Location map of the West Approach Bridge North Project
 
Hollow columns on the existing west approach bridge

2006 photo of a damaged hollow column on the existing west approach bridge that has since been repaired. The columns for the West Approach Bridge North Project will be built to modern earthquake standards.

Rendering of the West Approach Bridge North bicycle/pedestrian path

Rendering of the West Approach Bridge North transit/HOV lane

Renderings of the new West Approach Bridge North Project. Visit the design page for more.

Status

August 2014

WABN contractor selected

  • Flatiron West, Inc. has been selected as the contractor for the West Approach Bridge North. Construction will begin this fall with the new bridge targeting to open to traffic in summer 2017.
  • Watch our new video which highlights some of the construction activities that will take place during the WABN Project.
  • Sign up now to receive regular WABN construction email updates. Check the box for “SR 520 West Approach Bridge North Project” under “Construction Reports” in the subscription list.

WABN construction planning documents posted

Why is WSDOT building a new west approach bridge?

The existing west approach bridge is a fixed structure that connects the floating bridge to the Montlake interchange. The hollow columns supporting the bridge are vulnerable to a catastrophic earthquake, and the four-lane roadway has narrow shoulders and no transit/HOV or bicycle/pedestrian lanes.

The final design for the I-5 to Medina Bridge Replacement and HOV Project includes building two new west approach bridges – one each for eastbound and westbound traffic – that will connect the new floating bridge to the Montlake area. The new structures will be built to modern earthquake standards and support a six-lane corridor with a bicycle/pedestrian path that connects to local and regional trails.

At this time, WSDOT is funded to build the north approach bridge.

The End Result

When complete, the new west approach bridge north will connect westbound-traveling cars, buses, bicycles and pedestrians traveling from the floating bridge to the Montlake area.

Eastbound traffic will continue to use the existing west approach structure until funding is provided for the west approach bridge south.

If the existing west approach bridge fails in a catastrophic event, the west approach bridge north could support four lanes of traffic in an interim configuration.

Project Benefits

The West Approach Bridge North project will:

  • Build a new, seismically sound structure designed to modern earthquake standards.
  • Connect the new floating bridge to the Montlake area.
  • Complete the bicycle and pedestrian connection across Lake Washington.
  • Build environmental improvements like a new Arboretum trail, a public park north of SR 520, and a stormwater treatment facility at the old MOHAI site.
  • Remove the westbound Arboretum off-ramp and unused R.H. Thomson ramps.
  • Connect a new transit/HOV lane between Montlake and the Eastside.

What is the project timeline?

  • Spring 2014: Advertise WABN construction contract 
  • Summer 2014: Select contractor
  • Fall 2014: Begin construction 
  • Summer 2017: Open WABN to traffic 

Financial Information

Financial Data for PIN 852004B
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $150,109
Pre-Existing Funds (PEF) $1,178,606
Total $1,328,715

Project signage will reflect the cost of construction engineering, project bid award and sales tax.

The West Approach Bridge North project is fully funded.

Visit the SR 520 Costs, Funding and Tolling page for additional information about SR 520 program funding.

How can I get more information?
Contact:

Email: SR520bridge@wsdot.wa.gov

Phone: 206-770-3500

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

Mail: West Approach Bridge North Project
SR 520 Bridge Replacement and HOV Program
999 3rd Avenue, Suite 900
Seattle, WA 98104

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