Fourth-Lockett Roundabout

The Arizona Department of Transportation, in cooperation with the city of Flagstaff, initiated a project to construct a new roundabout that will replace the signalized intersection at Fourth Street and Cedar Avenue/Lockett Road to improve the safety and function of the intersection. This new roundabout will be designed with flashing pedestrian crossing beacons and will slow speeds, help avoid angle collisions and add a crosswalk at the fourth-leg of the intersection. Additional work includes the installation of water, sewer and storm drain infrastructure.

Preliminary construction activities are set to begin on early spring 2025.

Preliminary work consists of tree removal, fence installation, concrete removal and storm drain installation along the perimeter of the intersection. A full closure of the Fourth Street and Cedar Avenue/Lockett Road intersection is scheduled for the entire 2025 school summer break (May 23 to Aug. 4), with the full project anticipated to be complete in fall 2025. The new roundabout will be installed during this full closure.

Project Area Map

Project Elements

Construct a new roundabout in the Fourth Street and Cedar Avenue/Lockett Road intersection.
Install new water, sewer and storm drain infrastructure.
Install flashing pedestrian crossing beacons, pavement markings and signage.

What to Expect

Work may occur Monday through Friday, from 6 a.m. to 6 p.m., with occasional night and weekend work as needed. During preliminary construction activities, the intersection of Fourth and Cedar Avenue/Lockett Road will remain open to both motorists and pedestrians, however, expect lane and sidewalk restrictions, modified bus routes, heavy equipment, loud noise and flagging operations. Access for schools, businesses and residents will always be provided. Please follow the marked signage and travel safely. Note that this work is highly weather dependent.

A full closure of the Fourth Street and Cedar Avenue/Lockett Road intersection will occur throughout the entire 2025 school summer break (May 23 to Aug. 4). Detour routes will be in place during this closure period. Notifications will be provided prior to the full intersection closure with more information.

Stay Informed

To learn more about this project, including its technical details, funding and history, visit the City of Flagstaff’s project web page.

Future project communication will be provided via email updates. To subscribe to these updates, fill out the form on our project website or send a request to [email protected].

For questions and additional information, call the Project Hotline at 928-255-5153.