Several significant road improvement initiatives have transitioned into active construction phases in the Flagstaff area. The Arizona Department of Transportation (ADOT) has resumed work on a $21 million project along Interstate 17, approximately 12 miles south of Flagstaff. This effort involves installing eight miles of wildlife fencing between Kelly Canyon and Munds Park to mitigate animal-vehicle collisions.12 Limited lane restrictions are in place as crews complete the remaining tasks, with full project completion expected by fall 2026.
SR 89A Safety Enhancements
Along State Route 89A in Oak Creek Canyon, roughly 13 miles north of Sedona, construction has begun to replace aging guardrails and install concrete barriers along the scenic switchbacks. This work, aimed at bolstering safety on the popular route connecting Sedona and Flagstaff, includes 24-hour lane restrictions, temporary traffic signals, and daytime closures on weekdays. Alternate routes via I-17 and SR 179 are recommended for travelers. The project is slated for completion in late summer 2026.13
I-40 Pavement and Signage Updates
On Interstate 40 west of Williams, pavement repair work commenced this month, addressing deterioration over several miles with an anticipated finish by summer 2026. Further enhancements include the installation of a variable speed limit signage system along I-40 from Transwestern Road to I-17, between Bellemont and Flagstaff, set to begin this spring and conclude by late fall. These upgrades will dynamically adjust speeds in response to weather, crashes, or construction.4
Meanwhile, the City of Flagstaff continues design efforts for its 2026 Road Repair and Street Safety Program, evaluating streets such as Highway 89 and Industrial Drive using a pavement scoring system. Ongoing projects like the Lone Tree Road extension persist toward a November 2026 completion.5
Looking ahead, drivers can expect continued lane restrictions and potential delays on these routes through the summer, particularly during peak travel periods. ADOT urges motorists to check AZ511.com for real-time updates and to slow down in work zones.1