Trail Project

The One Arroyo Trail Critical Linkages Project is designed to address the deterioration of the Arroyo Seco's trail system by connecting three distinct areas, improving trail conditions, and reopening the historic Mayberry-Parker bridge. The Arroyo Seco encompasses nearly 1,000 acres of urban forest and offers 22 miles of potential continuous trails, serving as a vital resource for Pasadena residents. However, heavy use, erosion, and deferred maintenance have made some trails inaccessible and unsafe.

In addition to improving the trail system within the Arroyo Seco parklands, the Project will also improve trail and access connections to the north into the Angeles National Forest and to the south along the Arroyo Seco to the Los Angeles River. Educational opportunities will be incorporated into the project, engaging local schools in the One Arroyo vision and providing interpretive improvements at scenic, historic, and culturally significant locations.

Phase 2

Update: October 14, 2024

Upper Loop Trail Update

We are pleased to announce that work on the Upper Loop Trail is complete. We hope you enjoy the trail!

Lower Arroyo Trail Update

Construction has commenced on the Lower Arroyo Trail system, with current efforts focused on the section from the casting pond to the Colorado Street Bridge. Please note that trail closures will occur during daytime hours. We encourage users to utilize the maintenance road along the concrete flood control channel as an alternate route during this time.

Thank you for your patience as we work to enhance these trails for all to enjoy.

Previous Trail Updates

  • The highly anticipated restoration of the One Arroyo Trail commenced on Tuesday, September 3. The Upper Loop Trail will be the first area to undergo improvements. As part of this project, the east side of the trail, from Rosemont Drive to the base of Devil’s Gate Dam, will be closed during daylight hours for construction. Please note that, depending on the scope of work, overnight closures may also be necessary. During this period, the west side of the trail will remain open for public use.

    We greatly appreciate your cooperation in respecting the trail closures and supporting the contractors as they work to enhance this beloved natural space

  • The highly anticipated restoration of the One Arroyo Trail commenced on Tuesday, September 3. The Upper Loop Trail is the first area to undergo improvements. As part of this project, the east and west side of the trail, from Rosemont Drive to the base of Devil’s Gate Dam, will be closed during daylight hours for construction. Please note that, depending on the scope of work, overnight closures may also be necessary.

    We greatly appreciate your cooperation in respecting the trail closures and supporting the contractors as they work to enhance this beloved natural space.

  • Upper Loop Trail Update

    We are pleased to announce that work on the Upper Loop Trail is nearing completion. The eastside trail, spanning from Rosemont to Devil’s Gate Dam, has been reopened for public use. The westside trail is in its final stages of construction and is expected to open by Tuesday morning.

    Lower Arroyo Trail Update

    Construction has commenced on the Lower Arroyo Trail system, with current efforts focused on the section from the casting pond to the Colorado Street Bridge. Please note that trail closures will occur during daytime hours. We encourage users to utilize the maintenance road along the concrete flood control channel as an alternate route during this time.

    Thank you for your patience as we work to enhance these trails for all to enjoy.

Leave the road; take the trails - Pythagoras