In November 2016, Graham Contracting Ltd. submitted the apparent best value of $7.29 million for this design-build project. Construction began in January 2017, with the new lane expected to open to traffic by spring 2017.
Why is WSDOT
building this project?
Northbound Interstate 405 experiences heavy congestion, especially in the Bothell area during the afternoon commute. With funding from I-405 toll revenue, the Washington State Department of Transportation plans to build new capacity between State Route 527 and I-5 to help relieve congestion.
The End Result
The primary focus of this project is building a new northbound peak use shoulder lane, which will add new capacity for general purpose traffic. The new lane will extend for about 1.8 miles between SR 527 and I-5.
WSDOT will also construct one new noise wall along northbound I-405.
Overhead lane control signs will display whether the peak use shoulder lane is open to traffic. The lane will generally be open to traffic during the peak afternoon commute (3 to 7 p.m.). Vehicles over 10,000 gross vehicle weight will be prohibited from using the lane, with the exception of buses.
By building more capacity to handle the large volumes of traffic entering I-405 from SR 527, we expect to improve congestion that travelers are experiencing, especially in the area near the SR 522 interchange, where I-405 has less capacity.
The I-405 project office is evaluating additional longer-term projects to provide benefits in the area between SR 522 and I-5.
What is the project timeline?
Contract awarded: November 2016 to Graham Contracting Ltd.
Preliminary tree removal:
January 2017Open to traffic:
Bulk of tree Removal: Spring 2017
Noise wall construction: Spring 2017
|Financial Data for PIN 140561W
||Amount ($ in thousands)
|2003 Gas Tax (Nickel Funding)
|2005 Gas Tax (TPA)
|Pre-Existing Funds (PEF)
Project signage will reflect the cost of construction engineering, project bid award and sales tax.
How can I get more information?
Craig Smiley, I-405 Public Information
Chun-Ho Chen, Project Engineer
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