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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

April 2014

WABN construction planning documents posted

Construction Outreach Survey Report posted

  • As we prepare for WABN construction, we wanted to know how you prefer to receive information and stay in touch with the project team.
  • We received more than 740 responses following a five-week-long survey period.
  • View the report in our program library.


Construction begins on the West Approach Bridge North Project in 2014.

For information about the West Connection Bridge, please visit the West Connection Bridge page.

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 ā€“ one each for eastbound and westbound traffic ā€“ 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 
  • Spring 2014: Select contractor team 
  • Summer 2014: Begin construction 
  • Fall 2016: Open west approach bridge north to traffic

Financial Information

Financial Data for PIN 852004B
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $96,405
Pre-Existing Funds (PEF) $1,077,527
Total $1,173,931

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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