SR 531 (172nd St NE)/40th Ave Intersection

Project Description

The City of Arlington will be installing a traffic signal at the intersection of 40th Ave and SR 531 with a solid median between 43rd Ave and Smokey Point Blvd. Specific project components include traffic signal with protected left-turn movements, ADA compliant pedestrian crosswalks, enhanced intersection lighting, replacement of left turn lane with solid median for corridor safety, and bus stop pull outs.

Project Benefits

  • Enhance pedestrian safety
  • Improve traffic safety and mobility
  • Add bus stops

Project Cost and Funding

  • Engineer’s Estimate:  $1,400,000
  • Washington State Transportation Improvement Broad  Grant:  $1,120,000
  • City of Arlington funds:  $280,000

Project Schedule

  • Design:   Spring-Fall 2020
  • Estimated bid time: Spring 2021
  • Construction:  2021/2022


Community Outreach & Coordination

Regular schedule updates will be provided by the city to keep local businesses and community apprised of the project progress and any potential impacts.


If you have questions or concerns on this project, please contact the City Project Hotline at 360-403-3544 or

Project Documents

To translate documents, download the document then click the link: 

Project Updates

  • Design contract awarded to Perteet Engineers
  • Interactive Webpage: 
  • August 31 - Bid Opening
  • September 21 - Bid Awarded to Interwest Construction