I-90 - SR 18 Interchange Improvements - Contractor resources

Project delivery

WSDOT will manage project construction for the I-90 - SR 18 Interchange Improvements and Widening project through a design-build contract. With design-build, we execute a single contract with one entity (the design-builder) for design and construction services. Please note the preferred alternative selected by WSDOT includes a diverging diamond interchange and widening SR 18. This includes a "base scope" option, and two "base scope plus" options. More information about the base scope, the base scope options, deadlines and more project and contract information is available on the project's contract ad and award webpage. 

Procurement schedule

  • Request for Qualifications (RFQ) issued: June 30, 2020
  • Statement of Qualifications due: Aug. 27, 2020
  • Request for Proposals issued: Aug. 2, 2021
  • Proposals due: Nov. 9, 2021
  • Announce Apparent Best Value Proposer: Dec. 29, 2021
  • Estimated Notice To Proceed (NTP): Feb. 21, 2022

*Please note these dates are approximate and subject to change

For email notifications on this and other opportunities, subscribe to the Construction Contract Opportunities and Contractor bulletin.

Additional resources

WSDOT Contracts and Awards: www.wsdot.wa.gov/biz/contaa/prequal/default.htm
To request project materials like plans and surveys, please visit: www.wsdot.wa.gov/Contact/PublicDisclosure/default.htm


General contractor information

Project information