US 180: Flagstaff - Valle Pavement Preservation

US 180 Flagstaff Project Map

The Arizona Department of Transportation is starting a new pavement preservation project on US 180 north of Flagstaff.

ADOT crews will remove the top layer of the existing pavement and replace it with new asphalt along 15 miles of US 180 between the communities of Flagstaff and Valle (mileposts 235 - 250). Work on the new $1.3 million project is scheduled to be completed in fall 2020.

What to Expect

  • US 180 is currently narrowed to one lane of alternating east- and westbound travel while the pavement preservation work is done in 3-mile increments.
  • The restrictions will be in place from 5 a.m. to 7 p.m. Mondays through Fridays. Crews will remove traffic-control devices after work is completed each day.
  • Flaggers and pilot cars will be used to stop and direct motorists through the work zone.
  • The posted speed limit in the work zone will be reduced to 35 mph.
  • Delays up to 15 minutes.

ADOT reminds drivers to slow down, be prepared to stop and use caution around construction personnel and equipment.

Other project elements  

Other elements of the project including using a specialized roadway smoothing process – called diamond grinding – and then applying a chip seal coating on top of the newly paved section of roadway.

The diamond grinding process entails using machines with diamond-tipped blades on rotating drums to smooth a highway’s existing pavement.

The preservation project, which will help protect the condition of the pavement and extend the life of the roadway, is scheduled to continue for approximately four months.

With state highways essential to delivering goods and services, ADOT, its employees and its contractor partners are dedicated to delivering transportation improvement projects during the current public health situation. To learn more, please visit the Covid-19 Resource Center.

Schedules are subject to change based on weather or other unforeseen factors.

Restrictions and Closures

For information about project-related restrictions and closures please visit or call 511, except while driving.

ADOT will provide updated information about project schedules and potential traffic impacts as information becomes available. Stay informed of traffic restrictions before they occur by subscribing to receive timely Traffic Alerts by email.


  • Online: Submit a question or comment through the ADOT website. Visit and then select Projects from the dropdown menu.
  • By phone: Call the ADOT Bilingual Project Information Line at 855.712.8530.
  • By mail: ADOT Communications, 1655 W. Jackson Street MD 123F, Phoenix, AZ 85007