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SR520 Montlake

Seattle, WA

Contract Value:

$455 Million

Prime Consultant:

Tylin International

Project Owner:


Contract Format:

Design Build

Completion Date:

February 2023

Contract Duration:

50 months

The “Montlake Phase” is one of several projects programmed to replace windstorm and earthquake-vulnerable structures as well as to improve mobility for people and commerce across Lake Washington and through the SR 520 corridor from Seattle to Redmond.

 The Montlake Phase project will include:

  • Replacing the West Approach Bridge with a new West Approach Bridge South structure,
  • Replacing the existing Montlake Blvd. undercrossing with a new community enhanced lid structure. The new lid structure includes modifications to the SR 520 and Montlake Blvd. interchange and the 24th Ave E interchange
  • The addition of two new direct access ramps at the reconstructed 24th Ave E interchange including an EB on-ramp and a WB off-ramp,
  • New pedestrian crossing over SR 520, connecting pedestrian trails from the Washington Park Arboretum with pedestrian trails at the East Montlake Park, and
  • Other multi-modal improvements including improved connections for paths and trails at various locations, and completion of a new shared-use tunnel under Montlake Blvd.

For additional information about this project, please visit the following links:

General Information
WSDOT SR 520 website 
Upcoming Bid Opportunities 2021/2022

Subtrade Registration
Graham uses SmartBid to forward all solicitations. Work packages have been identified on the project based on the NAICS codes that are applicable to the scopes of work. To receive information and get on the bid list, complete the Subtrade Registration Form below, and ensure your NAICS codes are up to date and reflect all the work you currently perform. 
Subtrade Registration Form - please complete and submit as per the instructions on the form 

Inclusion Program  
Graham SR520 Project Team believe that the success of the MSVWBE program hinges on the development and implementation of a well-managed Inclusion Program and wishes to utilize and/or mentor MSVWBE contractors whenever feasible.
WSDOT SR 520 Diversity Program - overview
Veteran Owned Business Certification

Tom McMillan, Procurement Manager