Interstate 40: A-1 Mountain Road Bridge Replacement - Flagstaff


The Arizona Department of Transportation, in conjunction with the Federal Highway Administration, is planning the replacement of the A-1 Mountain Road Bridge on Interstate 40. The project is approximately 5 miles west of the junction with Interstate 17 at milepost 190 in Flagstaff. 

The $4.9 million project consists of removing and replacing the existing bridge. Construction is anticipated to begin this spring and last through fall 2022. The project will occur within ADOT right of way and easements.

Project map image click to open pdf of map

What to expect

Throughout construction, there will be travel restrictions through the area. This includes some overnight closures of I-40 when traffic will be detoured to the A-1 Mountain Road on- and off ramps. 

In addition, a 40-day temporary full closure of the A-1 Mountain Road Bridge will be needed  to accelerate demolition of the existing bridge and construction of the new bridge.

During the full closure of the A-1 Mountain Road Bridge, eastbound I-40 drivers wanting to exit A-1 Mountain Road will be detoured to Exit 191 to turn around and travel west to access A-1 Mountain Road. Drivers on A-1 Mountain Road who want to travel eastbound on I-40 will first travel westbound on I-40  and exit Hughes Avenue (Exit 185-Bellemont) to turn around and travel eastbound.

Stay Informed

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Phone: ADOT Project Information Line: 855.712.8530.

Teléfono: Línea de Información del Proyecto ADOT: 855.712.8530

Online: Submit a question or comment through the ADOT website. Visit and then select Projects from the dropdown menu.

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