Rio de Flag Bridge Replacement

Project Overview

The Arizona Department of Transportation and the Federal Highway Administration are replacing the Rio de Flag bridge located in Coconino County within the city of Flagstaff on Historic Route 66 (SR 40 B) near City Hall. The Rio de Flag bridge was built as part of the original State Route 66 in 1934. The $4.9 million project which involves an accelerated bridge construction and over-excavation under the bridge for a future city of Flagstaff Rio de Flag flood control project, is scheduled for completion by fall 2021.

Project area map 

Rio de Flag Bridge Project Map

What to expect

  • East- and westbound Historic Route 66 will be restricted to one lane in each direction. Traffic will be shifted to the north or south side of the bridge for approximately four weeks during the winter.
  • There will be a week-long full closure of Historic Route 66 to remove the existing bridge and move the new bridge into place during the spring of 2021. 

Restrictions and Closures

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

Stay Informed

Email: Subscribe to receive project updates and traffic alerts.
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.
Twitter: Follow ADOT on Twitter  (@ArizonaDOT) for real-time highway conditions statewide.