133rd Ave NE Grid Road Extension & Roundabout

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The City of Woodinville has extended 133rd Avenue NE, a key component of the downtown street grid. As part of this project, a new roundabout is being constructed to connect Woodinville-Snohomish Road and Little Bear Creek Parkway (NE 177th Place).

A dedicated pedestrian and bicycle tunnel beneath the roundabout will be included. This tunnel will allow the Eastrail regional trail to pass safely and continuously through downtown, improving connectivity and access for trail users. The new roundabout, tunnel, and road extension will help reduce traffic congestion, enhance safety for all users, and support the development of the Eastrail Corridor.



Project Updates

DEC 15, 2025: Construction activities will pause for the winter beginning December 22 and are scheduled to resume on February 23, 2026, when winter weather conditions improve. On December 19 at 5:00 pm, Woodinville-Snohomish Rd, from 132nd Ave NE to east of the Woodinville Post Office will reopen to traffic.

Scroll to the bottom of this page and click the Project Updates tab for the latest updates.



Key Benefits

  • Smoother Travel, Every Day: The roundabout will keep vehicles moving more smoothly than traditional signalized intersections, reducing backups and improving travel times.
  • Reduced Congestion: Provides an alternative route through downtown to help relieve pressure on the heavily traveled NE 175th Street corridor.
  • Safe Crossings for People, Not Just Cars: The dedicated Eastrail Trail tunnel beneath the roundabout ensures that the public can cross safely, separated from vehicle traffic.
  • Better Downtown Access: Improves connections to and from downtown, supporting access for drivers, cyclists, and pedestrians alike.
  • An Open Canvas for Nature and Art: Creates space for improved landscaping, pollinator pathways, public artwork, and future enhancements along the trail corridor.


Why a Roundabout and Tunnel?

A Citty traffic analysis showed that a traditional roundabout outperforms other intersection options, like signalized intersections, both now and in the future. Roundabouts reduce vehicle delay, improve truck maneuverability, and have a smaller long-term impact on traffic congestion. Roundabouts also offer more flexibility for integrating pedestrian and trail features like the planned Eastrail Trail tunnel, making them the best choice for balancing vehicle efficiency and non-motorized safety.

While more complex and costly to construct, the tunnel provides a safe, grade-separated crossing for pedestrians and cyclists and avoids future conflicts between trail traffic and vehicles. This investment ensures the trail corridor remains continuous and accessible for years to come.


Public Art Roundabout Selection


Unlocking the Eastrail Corridor

This roundabout and tunnel project is the first phase of Woodinville’s broader Eastrail Corridor initiative—a 1.7-mile multi-use trail and linear park connecting Woodinville to the regional Eastrail system. When complete, the corridor will:

  • Connect downtown and the Warehouse District to the Sammamish River Trail and future Centennial Trail.
  • Serve more than 4,000 residents living within a half mile of the corridor.
  • Improve stormwater management and protect salmon habitat in Little Bear Creek.
  • Support local businesses, wineries, parks, and tourism.
  • Link to major Eastside employers through an active transportation network.
  • Provide safe, nonmotorized access to schools, jobs, and transit hubs.

This roundabout project resolves a critical access and infrastructure challenge, unlocking the corridor and enabling future phases of the Eastrail vision.

The City of Woodinville has extended 133rd Avenue NE, a key component of the downtown street grid. As part of this project, a new roundabout is being constructed to connect Woodinville-Snohomish Road and Little Bear Creek Parkway (NE 177th Place).

A dedicated pedestrian and bicycle tunnel beneath the roundabout will be included. This tunnel will allow the Eastrail regional trail to pass safely and continuously through downtown, improving connectivity and access for trail users. The new roundabout, tunnel, and road extension will help reduce traffic congestion, enhance safety for all users, and support the development of the Eastrail Corridor.



Project Updates

DEC 15, 2025: Construction activities will pause for the winter beginning December 22 and are scheduled to resume on February 23, 2026, when winter weather conditions improve. On December 19 at 5:00 pm, Woodinville-Snohomish Rd, from 132nd Ave NE to east of the Woodinville Post Office will reopen to traffic.

Scroll to the bottom of this page and click the Project Updates tab for the latest updates.



Key Benefits

  • Smoother Travel, Every Day: The roundabout will keep vehicles moving more smoothly than traditional signalized intersections, reducing backups and improving travel times.
  • Reduced Congestion: Provides an alternative route through downtown to help relieve pressure on the heavily traveled NE 175th Street corridor.
  • Safe Crossings for People, Not Just Cars: The dedicated Eastrail Trail tunnel beneath the roundabout ensures that the public can cross safely, separated from vehicle traffic.
  • Better Downtown Access: Improves connections to and from downtown, supporting access for drivers, cyclists, and pedestrians alike.
  • An Open Canvas for Nature and Art: Creates space for improved landscaping, pollinator pathways, public artwork, and future enhancements along the trail corridor.


Why a Roundabout and Tunnel?

A Citty traffic analysis showed that a traditional roundabout outperforms other intersection options, like signalized intersections, both now and in the future. Roundabouts reduce vehicle delay, improve truck maneuverability, and have a smaller long-term impact on traffic congestion. Roundabouts also offer more flexibility for integrating pedestrian and trail features like the planned Eastrail Trail tunnel, making them the best choice for balancing vehicle efficiency and non-motorized safety.

While more complex and costly to construct, the tunnel provides a safe, grade-separated crossing for pedestrians and cyclists and avoids future conflicts between trail traffic and vehicles. This investment ensures the trail corridor remains continuous and accessible for years to come.


Public Art Roundabout Selection


Unlocking the Eastrail Corridor

This roundabout and tunnel project is the first phase of Woodinville’s broader Eastrail Corridor initiative—a 1.7-mile multi-use trail and linear park connecting Woodinville to the regional Eastrail system. When complete, the corridor will:

  • Connect downtown and the Warehouse District to the Sammamish River Trail and future Centennial Trail.
  • Serve more than 4,000 residents living within a half mile of the corridor.
  • Improve stormwater management and protect salmon habitat in Little Bear Creek.
  • Support local businesses, wineries, parks, and tourism.
  • Link to major Eastside employers through an active transportation network.
  • Provide safe, nonmotorized access to schools, jobs, and transit hubs.

This roundabout project resolves a critical access and infrastructure challenge, unlocking the corridor and enabling future phases of the Eastrail vision.

  • Construction Update 12/15/25

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    Construction activities will pause for the winter beginning December 22 and are scheduled to resume on February 23, 2026, when winter weather conditions improve. The project remains on schedule for completion summer 2026.

    Key Dates and Traffic Impacts

    • Friday, December 19, 2025 at 5:00 p.m.
      Woodinville-Snohomish Road, from 132nd Avenue NE to just east of the Woodinville Post Office, will reopen to traffic.

    • Monday, February 23, 2026
      Woodinville-Snohomish Road, from 132nd Avenue NE to just east of the Woodinville Post Office, will close again as construction resumes.

    The City appreciates the community's patience and cooperation during this project and for the continued support.

    Please check back in mid-February for future updates as construction progresses.


  • Construction Update 10/29/25

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    Work crews are currently moving and leveling earth around the new tunnel being built beneath the future roundabout. This critical groundwork will create gently sloped entryways into the tunnel, improving safety and accessibility for pedestrians and cyclists who will be able to cross under 133rd Avenue NE once the project is complete.

    The section of Woodinville–Snohomish Road that is currently closed is expected to reopen by the end of this year. Construction activity will pause for the winter season in mid-December and is anticipated to resume at the end of February 2026.


  • News Station Highlights Construction Projects 10-13-25

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    Seattle's KING 5 news highlighted the 133rd Roundabout and Eastrail Corridor projects and how the projects will define the region for the next century.

    Watch the full story here.
    We’re proud to see these projects gaining attention and making a positive impact on our community!

  • Section of Woodinville-Snohomish Rd Temporary Closure 9-3-25

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    Upcoming Road Closure: Woodinville-Snohomish Road

    Project: 133rd Avenue Roundabout Construction

    A full road closure will begin on September 8 on Woodinville-Snohomish Road, extending from 132nd Avenue NE to just east of the Woodinville Post Office.

    Key Information:

    • Local access to businesses within the closure area will be maintained.
    • Traffic flaggers will be on-site to manage vehicle flow and ensure safety.
    • Intermittent stops are expected as trucks enter and exit the work zone.

    The City appreciates the community’s understanding and cooperation during this important infrastructure project. The road is expected to reopen by the end of 2025.