40th Ave / SR 531 (172nd ST) 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.

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Project Benefits

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

Project Cost and Funding

  • Engineer’s Estimate:  $1,845,515
  • Project Cost: $1,817,509
  • Washington State Transportation Improvement Broad  Grant:  $1,120,000
  • City of Arlington funds:  $697,509

Project Schedule

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

FAQ's

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.

Questions?

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

Project Documents

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Project Updates

  • Design contract awarded to Perteet Engineers
  • Interactive Webpage: https://bit.ly/40thAveIntersection 
  • August 31 - Bid Opening
  • September 21 - Bid Awarded to Interwest Construction
  • March 23, 2022 - Estimated construction start date is April 4, 2022. 
  • April 1, 2022 - Construction will begin on Monday, April 4th. During the first week of construction the City’s contractor, Interwest Construction, will work Monday thru Friday from 7:00 AM to 7:00 PM.  Work will consist of mobilization, surveying the project area, and saw cutting at the intersection corners. The saw cutting will be completed during non-peak travel hours along the east bound lanes early morning and the west bound lanes mid-morning to early afternoon. This work will require lane shifts. Please expect delays if traveling along SR 531 during construction hours.
  • April 8, 2022 - Next week, work will continue between the hours of 7:00AM to 7:00PM, Monday through Friday.  Work will include the moving of a communication pole, installation of the temporary pedestrian access, installation of the new storm system, and removal of the curbs and sidewalks. The curb and sidewalk removal will be completed during the hours of 7:00AM to Noon along the eastbound lanes, and in the early afternoon for the west bound lanes. This work will require lane shifts. Please expect delays during construction hours.
  • April 15, 2022 - Next week work is scheduled Monday – Friday from 7:00 AM to 7:00 PM. Work will consist of removing curb and sidewalk on the south side of 172nd St, road excavation for the bus pullouts, and begin electrical installation of the new signal system.  The roadwork will require lane shifts during the morning hours, please expect delays.
  • April 18, 2022 - Right and left hand turns heading northbound out of the Gateway complex at 40th Ave will be closed until the demolition of the curbs on the south side of 172nd St is complete during the construction hours of 6:00 AM to 6:00 PM.  Traffic is currently flagger controlled, please expect delays when in this area.
  • April 22, 2022 - Next week ICI will continue work on the south side of the intersection with the installation of the new storm system, addition of subgrade material, begin to build the retaining wall on the southeast corner, and continue the electrical installation for the new signal system. Left turns heading north from 40th Ave onto 172nd St will be prohibited while this work is being completed. Please expect delays in travel times and remember to drive slow through construction zones.
  • April 29, 2022 - Next week work will continue with the electrical conduit installation for the new signal system. Impact to traffic is estimated to be minimal.
  • May 6, 2022 - Next week work will continue on the installation of the electrical conduit, fine grading for the curb and sidewalk on the SE corner, and begin formwork for curb and sidewalk on the NW, NE and SW corners. Left turns heading north from 40th Ave onto 172nd St will be prohibited while this work is being completed. Please expect delays in travel times and continue to drive slowly through construction zones for everyone’s safety.
  • May 13, 2022 - Next week work will continue with the electrical conduit installation.  All traffic movement will be open at the intersection of 40th and 172nd St. Please continue to expect delays in travel times.
  • May 20, 2022 - Next week work is scheduled for Monday through Thursday during the night hours of 7:00 PM to 7:00 AM. Work will include the relocation of an existing fire hydrant, initial paving, and median removal. Please expect delays in travel times along with short lane closures when the work area is changing.