43rd Ave & SR 531 (172nd St) Roundabout

Project Description

Amazon.com Services, LLC will be constructing a roundabout at the intersection of 43rd Avenue NE and 172nd Street NE to improve vehicle safety and mobility through the intersection and the 172nd Street corridor. 

Additional benefits include improved pedestrian crosswalks, illumination, and a new trail from 43rd Avenue NE to 51st Avenue NE. 

This is being designed in coordination with the Department of Transportation’s corridor improvement project along 172nd Street from this intersection to 67th Avenue.

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Click here to view WSDOT SR 531 Widening Project Page.  

Project Benefits

  • Increased pedestrian & vehicle safety
  • Improved mobility
  • Add multi-use trail

Project Funding

  • Funded by: Amazon,com Services, LLC
  • Coordinated by: Panattoni Development Company, Inc.
  • Constructed By: Clark Construction Group, LLC

Project Schedule

  • Phase 1: April - June 2022
    • Monday - Saturday, 6:00AM to 6:00 PM
  • Phase 2: June - August 2022

Questions?

If you have questions or concerns about this project, please contact Community and Economic Development at CED@arliingtonwa.gov or 360-403-3551.

Traffic Control Plans

Phase 1 - Traffic Control Plan

  • The first phase of construction will close the northbound and southbound legs of 43rd from 172nd. Detours and bypasses will be in place during this phase.
  • Eastbound and westbound traffic will travel directly through the intersection on two interior lanes, the light at 43rd will be temporarily covered.
  • Westbound traffic will be able to access Walmart, Heritage Bank, and the other businesses in that shopping area via the newly constructed 168th St.
  • Alternate access in and out of the 174th-179th Block neighborhood will be provided with a temporary road connecting 43rd to Airport Blvd.
  • In order to minimize impacts on traffic on 172nd, the contractor may require two to four nighttime full intersection closures.

Phase 2 - Traffic Control Phan

  • The second phase of construction will redirect eastbound and westbound traffic onto the completed outer lanes of the roundabout in order to construct the inner lanes and center island.
  • Access will be returned to the northbound and southbound legs of 43rd.  There will not be access for westbound traffic to turn left onto the south leg of 43rd
  • In order to minimize impacts on traffic on 172nd, the contractor may require two to four nighttime full intersection closures.
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Project Documents

Project Updates

  • March 30, 2022 - Estimated construction start date is April 4, 2022.
  • April 1, 2022 - The 43rd Ave Roundabout project will begin construction on Monday, April 4th. Construction will occur Monday thru Saturday from 6:00 AM to 6:00 PM. The contractor for the project, Clark Construction, will be diverting traffic around 43rd Ave during the first phase of construction. The detour will go into place Sunday evening at 6:00PM. 
  • April 8, 2022 - Next week construction will continue with the installation of the new stormwater system, site excavation and grading, and continued removal of the curb and sidewalks.  Construction is scheduled to occur Monday-Saturday from 6:00 AM to 6:00 PM.
  • April 15, 2022 - Next week scheduled work will include continued excavation, installation of electrical conduit and light pole bases, and the installation of crosswalk signs. Construction is scheduled to occur Monday-Saturday from 6:00 AM to 6:00 PM. 
  • April 22, 2022 -  Next week’s work includes continued electrical work, installation of fiber optic cable vaults, installation of a WSDOT camera pole, and placement of roadway base course.  Construction is scheduled to occur Monday-Saturday from 6:00 AM to 6:00 PM.
  • April 29, 2022 -  Next week’s work includes continued electrical work and addition of subgrade material, installation of fiber optic cable vaults, installation of a WSDOT camera pole, and installation of the north bio swale for the stormwater system. Construction is scheduled to occur Monday-Saturday from 6:00 AM to 6:00 PM. 
  • May 6, 2022 - Next week’s scheduled work includes the completion of the drainage system on the southwest corner, grading for curb and gutter, and begin to form and pour the curb and gutter. Construction is scheduled to occur Monday-Saturday from 6:00 AM to 6:00 PM. 
  • May 13 2022 - Next week’s scheduled work on the south side includes continued electrical and stormwater work. On the north side, work includes the installation of the bio swale, fiber vault, WSDOT camera system, and grade and pour for the sidewalk, ADA ramps, and splitter island. Construction is scheduled to occur Monday-Saturday from 6:00 AM to 6:00 PM.