Skip Top Navigation

I-405 - NE 6th to I-5 Widening and Express Toll Lanes

Construction Status

I-405 near NE 160th Street: part of the Bellevue to Lynnwood project area.
I-405 near NE 160th Street is a section of road that will benefit from this project.

160th loop ramp
Visit the project Flickr site for photos of construction progress.


March 2015

Express toll lanes
Learn more about why WSDOT is building express toll lanes.

  • Express toll lane equipment installation and testing have begun. You may notice flashing lights above the HOV lane, but no tolls will be charged until the new lanes open in late 2015. Learn more on the WSDOT blog.

Ongoing work at NE 160th Street interchange

Noise walls and tree removal

The NE 6th Street to I-5 (Bellevue to Lynnwood) Widening and Express Toll Lanes project will complement the widening between NE 85th Street and NE 124th Street (Kirkland Nickel Stage 1 project) by building one continuous northbound and southbound lane between NE 6th Street in Bellevue and SR 522 in Bothell. This new lane, when combined with the existing carpool lane, will operate as a dual express toll lane system from downtown Bellevue to Bothell/Woodinville. Additionally, the existing carpool lane from SR 522 to I-5 will be converted to a single express toll lane or high-occupancy vehicle toll (HOT) lane.

The new express toll lane system will provide 17 miles of congestion relief to Bellevue, Kirkland, and Bothell.

To further enhance traffic operations in the Bothell area, crews will build a northbound "braided" ramp system between the NE 160th Street and SR 522 interchanges. These ramps will separate the NE 160th Street to I-405 northbound traffic and the I-405 to SR 522 traffic to provide more efficient access to I-405 and SR 522.

To aid congestion on southbound I-405 in the Bothell area, WSDOT will build wider shoulders between SR 522 and NE 160th Street and between SR 527 and NE 195th Street, allowing buses to use the shoulders during peak periods.

Why is WSDOT building these new lanes?
Afternoon and morning congestion in this area is heavy because of commuters heading to and from Bellevue, as well as from commuters entering and exiting the University of Washington Bothell campus and business parks in Bothell and Kirkland.   

The End Result
The completed project adds additional traffic capacity between Kirkland and Bothell and combines it with the existing carpool lane to create a two-lane express toll system in both directions. This comprehensive project complements the Kirkland Nickel Stage 1 project in relieving congestion on I-405 in the north end of the corridor.

Project Benefits

  • Congestion relief.  The addition of the northbound and southbound lanes between NE 6th Street and SR 522 reduces congestion by increasing capacity.
  • Safety.  The additional capacity reduces sideswipe and congestion-related collisions.
  • Environment.  WSDOT's I-405 Corridor Program team is designing the NE 6th Street to I-5 Widening and express toll lanes project to avoid and minimize impacts to the environment. 

What is the project timeline?

  • March 2005:  The Kirkland Nickel Stage 2 improvements were cleared environmentally through the Kirkland Nickel Project EA .
  • Sept. 14, 2006:  The SR 520 to I-5 Improvement Project EA began scoping activities.
  • May 10, 2011: Bellevue to Lynnwood Environmental Assessment was published.
  • June 2012:  Construction began.
  • 2015:  Expected project completion.

Financial Information

Financial Data for PIN 840561A, 840561C, 840561D, 840566E, 840567B, 840576A
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $190,712
2005 Gas Tax (TPA) $249,024
Pre-Existing Funds (PEF) $24,084
Total $463,821

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

The information shown below reflects the current proposed project budget and schedule. The 2014 Legislature may consider changes to the transportation budget that may include adjustments to some project budgets and schedules. 

  • The construction contract amount for the NE 6th St. to I-5 Widening and Express Toll Lanes project is $155.5 million.

Total funding for all phases, which includes Project Engineering (PE), Right-of-Way, and Construction, is composed of the following:

  • Transportation 2003 Account (Nickel funding) - $109.6 million.
  • 2005 Gas Tax (Partnership Funding) - $249.1 million.
    In 2005, the Washington State Legislature provided funding towards this project by passing the Transportation Partnership Funding package.
  • Federal and Local Funds - $24 million. (PE and Right-of-Way)
  • Total Funding Available From All Sources - $383 million.

How can I get more information?
Amy Danberg
I-405 Project Team Office
600 - 108th Avenue NE
Suite 405
Bellevue, WA 98004

back to top