133rd Ave NE Grid Road Extension & Roundabout

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The City of Woodinville is extending 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).

The project also includes a dedicated pedestrian and bicycle tunnel beneath the roundabout. 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 - a future linear park and multi-use trail that will link neighborhoods, businesses, and regional trail systems throughout the area.


Construction 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: By offering an alternative route through downtown and a more efficient intersection design, the project will 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 cyclists and pedestrians can cross safely, separated from vehicle traffic.
  • Better Downtown Access: This extension and roundabout will improve connections to and from downtown, supporting access for drivers, cyclists, and pedestrians alike.
  • An Open Canvas for Nature and Art: The project also creates space for improved landscaping, pollinator pathways, public artwork, and future enhancements along the trail corridor.


Why a Roundabout and Tunnel?

The City’s traffic analysis showed that a traditional roundabout outperforms other intersection options, like signalized intersections, both now and in the future (through 2044). 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 non-motorized users and avoids future conflicts between trail traffic and vehicles. This investment aligns with the City’s long-term streetscape and transportation goals and ensures the trail corridor remains continuous and accessible for years to come.


Roundabout Art Selection


Unlocking the Eastrail Corridor

This roundabout and tunnel project is the first of Woodinville’s broader Eastrail Corridor effort - a 1.7-mile, multi-use trail and linear park that will connect to the regional Eastrail system. Once fully built, Woodinville’s Eastrail segment will:

  • Connect Downtown and the Warehouse District with the Sammamish River Trail and future Centennial Trail
  • Provide access for 4,000+ new residents living within ½ mile of the trail corridor
  • Enhance stormwater management and protect salmon habitat in nearby Little Bear Creek
  • Attract visitors to local businesses, wineries, and parks
  • Link to major Eastside employers through an active transportation network
  • Provide nonmotorized access to nearby schools, jobs, and transit hubs.

This roundabout project enables all of that by solving a key access and infrastructure challenge upfront and unlocking the corridor for what comes next.

The City of Woodinville is extending 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).

The project also includes a dedicated pedestrian and bicycle tunnel beneath the roundabout. 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 - a future linear park and multi-use trail that will link neighborhoods, businesses, and regional trail systems throughout the area.


Construction 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: By offering an alternative route through downtown and a more efficient intersection design, the project will 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 cyclists and pedestrians can cross safely, separated from vehicle traffic.
  • Better Downtown Access: This extension and roundabout will improve connections to and from downtown, supporting access for drivers, cyclists, and pedestrians alike.
  • An Open Canvas for Nature and Art: The project also creates space for improved landscaping, pollinator pathways, public artwork, and future enhancements along the trail corridor.


Why a Roundabout and Tunnel?

The City’s traffic analysis showed that a traditional roundabout outperforms other intersection options, like signalized intersections, both now and in the future (through 2044). 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 non-motorized users and avoids future conflicts between trail traffic and vehicles. This investment aligns with the City’s long-term streetscape and transportation goals and ensures the trail corridor remains continuous and accessible for years to come.


Roundabout Art Selection


Unlocking the Eastrail Corridor

This roundabout and tunnel project is the first of Woodinville’s broader Eastrail Corridor effort - a 1.7-mile, multi-use trail and linear park that will connect to the regional Eastrail system. Once fully built, Woodinville’s Eastrail segment will:

  • Connect Downtown and the Warehouse District with the Sammamish River Trail and future Centennial Trail
  • Provide access for 4,000+ new residents living within ½ mile of the trail corridor
  • Enhance stormwater management and protect salmon habitat in nearby Little Bear Creek
  • Attract visitors to local businesses, wineries, and parks
  • Link to major Eastside employers through an active transportation network
  • Provide nonmotorized access to nearby schools, jobs, and transit hubs.

This roundabout project enables all of that by solving a key access and infrastructure challenge upfront and unlocking the corridor for what comes next.

  • Woodinville-Snohomish Road Closure Begins Sept 8

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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 December 2025.

    Click on map to enlarge

Page last updated: 08 Sep 2025, 05:00 PM