• Contract

SR 509, 24th Avenue South to South 188th Street – New Expressway

Contract summary

WSDOT will build the remaining two miles of new SR 509 Expressway, reconfigure SR 509 interchanges at South 188th and South 160th Streets and add a southbound auxiliary lane on I-5 between SR 516 and South 272nd Street.

Public Works
Publication Date
Contract status
Awarded
Contract ID
009905
County
King County
Submittal due date and time
Estimated value
$400,000,000 - $500,000,000
Funding source
A federally funded contract with a 15% disadvantaged business enterprise condition of award goal for the design portion and a 22% goal for the construction portion.
Contact
Ali Amiri
Project Manager
  • Award Status: awarded 12/4/2023
  • Award amount: $478,875,985.00
  • Awarded to: Guy F. Atkinson
    707 South Grady Way, Suite 500
    Renton, WA 98057-3224

Redacted statement of qualifications and proposal

Redacted statement of qualifications and proposal (FTP Directory) - posted 1/17/2024

Conformed request for proposal

Price proposal opening results

Request for proposal addenda

Request for proposal Q&A

Voluntary proposers meeting

Request for proposal

Short listed submitter

Short list letter (PDF 231KB) - posted 7/21/2023

Procurement Update

Request for qualifications addenda

Q&A

Voluntary submitters meeting

Request for qualifications

Pre-advertisement information session

Project information available

  • Submitters list (PDF 36.4KB) - posted 5/18/2023
  • Pre-Ad Documents (FTP Directory) - updated 9/15/2023
    The files contained in in ‘Pre-Ad Documents’ folder and all subsequent subfolders are provided as a “draft” for informational purposes. As the projects are continuing to evolve, the information provided in these documents is subject to change. WSDOT makes no representation or warranty as to the accuracy, adequacy, applicability, or completeness of the files. WSDOT shall have no liability or obligation as a result of the inaccuracy, inadequacy, inapplicability, or incompleteness of the files, regardless of the contents thereof.
  • Pre-advertisement notice (PDF 123KB) - updated 2/21/2023
  • Fact sheet (PDF 617KB) - updated 8/18/2023