SR 520 Bridge Replacement and HOV Program - Contractor information

What is WSDOT's contracting process?

WSDOT hires contractors to complete construction projects. The contractor is responsible for hiring administrative and field staff to work on those projects.

The contractors below are responsible for securing vendors and sub-contractors for the listed projects, and assembling their workforce. WSDOT works with the contractors to ensure that notification is provided to all potential parties. Interested parties can contact the contractors using the contact information below.

Montlake Phase contracting opportunities
We published a Request for Proposals on Feb. 28 in preparation for selecting a design-build contractor for the upcoming Montlake Phase of SR 520 construction. Subcontractors and vendors interested in learning more about the RFP will find it on WSDOT’s Contract Ad and Award webpages. We expect construction on the Montlake Phase to start in late 2018.

Missed the March 29 Voluntary Proposers Meeting? Materials available online
WSDOT hosted a March 29 meeting to give interested designers and construction contractors the opportunity to learn more about the Montlake Phase construction project, hear updates on the contractor-procurement process, and meet the three short-listed design-build teams.

Materials from the meeting are available on the WSDOT Ad and Award website.

Other ways to learn about contracting with WSDOT:

  • To learn more about Disadvantaged Business Enterprise contracting opportunities, visit our Diversity Program page.
  • Contact the SR 520 contractors using the contact information below.

WSDOT advertises projects on the Contract Ad and Award website. At this website, contractors can view projects that are available for bid, learn about prequalifications, and stay up to date with contractor bulletins.


SR 520 construction contracts


Contract amount as awarded

Apprenticeship requirement

DBE goal


SR 520 Pontoon Construction Design-Build Project

$367 million (awarded to Kiewit-General Joint Venture Feb. 2010)

15 percent

6 percent


Eastside Transit and HOV Design-Build Project

$306 million (awarded to Eastside Corridor Constructors Nov. 2010)

15 percent

11 percent


SR 520 Floating Bridge and Landings Design-Build Project

$586.6 million (awarded to Kiewit/General/Manson, A Joint Venture August 2011)

15 percent

7 percent


Montlake to Evergreen Pt. Bridge West Approach Bridge North Design-Bid-Build Project*

$199.5 million (awarded to Flatiron West Inc. July 2014)

15 percent

10 percent

Open to traffic

*Design-bid-build project documents are available only through public disclosure request process.


Contractor contact information


Contact information

SR 520 Floating Bridge and Landings

A Joint Venture
3015 112th Ave. NE, Suite 100
Bellevue, WA 98004
Phone: 425-576-7100
Fax: 425-576-7159

Montlake to Evergreen Pt. Bridge West Approach Bridge North

Flatiron West, Inc.
2510 Lake Washington Blvd. E
Seattle, WA 98112
Phone: 206-770-3563


Apprenticeship requirements

Design-build and design-bid-build teams will comply with an apprentice utilization requirement. The goal is that 15 percent of project labor hours will be performed by apprentices. The apprenticeship program provides on-the-job training and supportive services to assist contractors with recruitment and placement of minorities and women, as well as to provide advocacy and support for individual apprentices/trainees participating in the program.


Additional resources