133rd Ave NE Grid Road Extension & Roundabout

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Project Overview

The City of Woodinville is getting ready to extend 133rd Avenue NE grid road and construct a new roundabout connecting Woodinville-Snohomish Road and Little Bear Creek Parkway (NE 177th Place). This project is more than a traffic improvement: it's a foundation for a safer, more connected downtown.

The new roundabout is part of the long-planned extension of 133rd Avenue NE, a critical link in the City’s downtown street grid. It will also include a dedicated pedestrian and bicycle tunnel beneath the roundabout, allowing the regional Eastrail Trail to pass safely and uninterrupted through the heart of downtown.

Together, the roundabout, tunnel, and street extension will reduce congestion, improve safety, and support the next phase of the Eastrail Corridor—a future linear park and multi-use trail that will connect neighborhoods, businesses, and regional trail systems.

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.


Project Background & Vision

Since incorporation in 1993, the City has prioritized building a complete downtown street grid. The 133rd Avenue NE extension closes a long-standing gap in that network, connecting NE 171st Street to NE 175th Street and Little Bear Creek Parkway across the former rail corridor.

This project arrives at a pivotal moment. With rails recently removed along the Eastrail Corridor and the Trestle Bridge replacement scheduled to begin shortly, the City is taking proactive steps now to reduce future traffic impacts, create safer multimodal options, and lay the groundwork for the next generation of public infrastructure.

Proactive Procurement: Saving Time, Reducing Risk

To keep the project on schedule and avoid construction delays, the City took an unusual but strategic step: procuring the pedestrian tunnel in advance, rather than waiting until the prime construction contractor was selected.

The prefabricated tunnel has a long lead time (3–4 months), and delaying procurement would have pushed construction well into the rainy season, increasing costs and risks. The City Council approved the $749,594 contract with Titan Earthwork in early 2025 and the tunnel is expected to arrive in August 2025.

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.


What’s Next?

With design complete and contracts awarded, the City is preparing for construction to begin later this summer. A groundbreaking ceremony is planned for July or August 2025. During construction, the City will work to minimize disruptions and keep the community informed. Due early tunnel procurement, the project schedule was accelerated by 4–5 months, keeping the overall Eastrail Corridor effort on track.

Key Milestones

  • Construction Contract Awarded: KLB Construction, LLC – June 2025
  • Pedestrian Tunnel Delivery: August 2025
  • Construction Begins: Late Summer 2025
  • Estimated Completion: Summer 2026

Stay Informed

The City will keep the community informed about the progress of the project through various public outreach opportunities. Updates will be shared on the City's social media platforms and through website news alerts. To stay up to date, subscribe online for the latest project news and updates.

Check this webpage soon for new updates on construction progress, traffic impacts, and community events related to the project!

Project Overview

The City of Woodinville is getting ready to extend 133rd Avenue NE grid road and construct a new roundabout connecting Woodinville-Snohomish Road and Little Bear Creek Parkway (NE 177th Place). This project is more than a traffic improvement: it's a foundation for a safer, more connected downtown.

The new roundabout is part of the long-planned extension of 133rd Avenue NE, a critical link in the City’s downtown street grid. It will also include a dedicated pedestrian and bicycle tunnel beneath the roundabout, allowing the regional Eastrail Trail to pass safely and uninterrupted through the heart of downtown.

Together, the roundabout, tunnel, and street extension will reduce congestion, improve safety, and support the next phase of the Eastrail Corridor—a future linear park and multi-use trail that will connect neighborhoods, businesses, and regional trail systems.

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.


Project Background & Vision

Since incorporation in 1993, the City has prioritized building a complete downtown street grid. The 133rd Avenue NE extension closes a long-standing gap in that network, connecting NE 171st Street to NE 175th Street and Little Bear Creek Parkway across the former rail corridor.

This project arrives at a pivotal moment. With rails recently removed along the Eastrail Corridor and the Trestle Bridge replacement scheduled to begin shortly, the City is taking proactive steps now to reduce future traffic impacts, create safer multimodal options, and lay the groundwork for the next generation of public infrastructure.

Proactive Procurement: Saving Time, Reducing Risk

To keep the project on schedule and avoid construction delays, the City took an unusual but strategic step: procuring the pedestrian tunnel in advance, rather than waiting until the prime construction contractor was selected.

The prefabricated tunnel has a long lead time (3–4 months), and delaying procurement would have pushed construction well into the rainy season, increasing costs and risks. The City Council approved the $749,594 contract with Titan Earthwork in early 2025 and the tunnel is expected to arrive in August 2025.

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.


What’s Next?

With design complete and contracts awarded, the City is preparing for construction to begin later this summer. A groundbreaking ceremony is planned for July or August 2025. During construction, the City will work to minimize disruptions and keep the community informed. Due early tunnel procurement, the project schedule was accelerated by 4–5 months, keeping the overall Eastrail Corridor effort on track.

Key Milestones

  • Construction Contract Awarded: KLB Construction, LLC – June 2025
  • Pedestrian Tunnel Delivery: August 2025
  • Construction Begins: Late Summer 2025
  • Estimated Completion: Summer 2026

Stay Informed

The City will keep the community informed about the progress of the project through various public outreach opportunities. Updates will be shared on the City's social media platforms and through website news alerts. To stay up to date, subscribe online for the latest project news and updates.

Check this webpage soon for new updates on construction progress, traffic impacts, and community events related to the project!

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Page last updated: 16 Jul 2025, 05:31 PM