I-405 - NE 6th to I-5 Widening and Express Toll Lanes - Complete December 2016

Project news

The NE 6th Street to I-5 (Bellevue to Lynnwood) Widening and Express Toll Lanes project complements the widening between NE 85th Street and NE 124th Street (Kirkland Nickel Stage 1 project) by building one continuous new 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, operates as a dual express toll lane system from downtown Bellevue to Bothell/Woodinville. Additionally, the existing carpool lane from SR 522 to I-5 was converted to a single express toll lane.

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

To further enhance traffic operations in the Bothell area, crews built a northbound "braided" ramp system between the NE 160th Street and SR 522 interchanges. These ramps 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.

In addition, to add strategic capacity on southbound I-405 in the Bothell area, WSDOT built 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.

Needs & benefits

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 dual express toll lane 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.


  • March 2005:  The Kirkland Nickel Stage 2 improvements were cleared environmentally through the Kirkland Nickel Project Environmental Assessment.
  • Sept. 14, 2006:  The SR 520 to I-5 Improvement Project Environmental Assessment began scoping activities.
  • May 10, 2011: Bellevue to Lynnwood Environmental Assessment was published.
  • June 2012:  Construction began.
  • Sept. 27, 2015: Express toll lanes opened to traffic.
  • Fall/Winter 2016:  Project completion.


Amount ($ in thousands)

  • 2003 Gas Tax (Nickel Funding) - $190,706
  • 2005 Gas Tax (TPA) - $244,025
  • Pre-Existing Funds (PEF) - $24,129
  • CWA - $0
  • Total - $458,860
  • Please note that total includes funding for other I-405 projects, including the Northeast 116th Interchange improvements, Kirkland Nickel Stage 1, and the Bothell auxiliary lane project.
  • The construction contract amount for the Bellevue to Lynnwood Widening and Express Toll Lanes project was $155.5 million.
  • The total Bellevue to Lynnwood project cost, including preliminary engineering, right-of-way, construction, and tolling, is $292 million.


I-405/SR 167 Corridor Communications

The Washington State Department of Transportation is a public agency and is subject to the State of Washington’s Public Records Act (RCW 42.56). Therefore, public comments and questions may be made available to anyone requesting them for non-commercial purposes.

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