Lone Tree Overpass Project

Lone Tree Overpass Project

Improving mobility and safety with a new north-south roadway connection extending Lone Tree Road between Butler Avenue to the south and Route 66 to the north.

Preliminary Overpass Design & Proposed Improvements

View PDF map
Cars driving on Lone Tree Rd
Flagstaff train station
Cars at intersection driving on Lone Tree Rd
Cars driving at the intersection of Lone Tree Rd and Butler Avenue
Businesses on Lone Tree Road
Painted brick wall

Project Updates

Construction will begin on Lone Tree Road beginning in May. Join us for an Informational Meeting in April.

Construction will include roadway and intersection improvements on Lone Tree Road from Brannen Avenue to O'Leary Street and on Butler Avenue from Elden Street to Lumber Street as part of the Lone Tree Corridor Overpass project.

Attend an in-person public meeting to learn about project design, construction phasing and traffic impacts, and how to stay up-to-date on construction activities.

Flagstaff City Hall
April 4, 2024 at 5:30 p.m.
View the April 2024 meeting notice.

Check out the latest project update

View the latest Lone Tree Overpass fact sheet for an update on the project and next steps, including the proposed phases of construction. A public meeting to discuss construction activities is planned for early 2024.

Final Design in Progress

The project team is currently working on final design completion with agencies and stakeholders. Design is anticipated to be complete by end of 2023. The public will continue to see field activities including utility locating and demolition of structures through the end of the year. A public meeting to discuss construction activities will be planned for early 2024.

Join us for our next round of public meetings scheduled for July!

The City of Flagstaff will be holding two public meetings to provide updates of the design and the Economic Impact Study and get input on project details including opportunities for public art, landscaping, and spaces for rest and recreation.

In-Person Public Meeting
The Murdoch Center
July 26, 2022 at 5:30 p.m.

Virtual Public Meeting
July 27, 2022 at 2:30 p.m.

More Information

Lone Tree Overpass Project Economic Impact Study Presented

On May 24, the project team presented the results of an Economic Impact Study (EIS) to Mayor and City Council. Please see the study for more information and let us know your thoughts using the comment form.

Lone Tree Overpass expected to reduce spending in Flagstaff's Southside businesses

Council directed city staff to conduct an EIS after traffic modeling showed that the Lone Tree Overpass project could reduce traffic flows. Read full article in the Arizona Daily Sun.

Flagstaff Transportation Commission Meeting

The Lone Tree Overpass team will be presenting to the Flagstaff Transportation Commission at its meeting on Thursday, January 13 at 4:00 PM MDT. You are invited to join this live, virtual meeting to hear the update on the Lone Tree Overpass Project.

The meeting will be held on Microsoft Teams. There are two options to join the meeting.

Click on the following link https://www.flagstaff.az.gov/Archive.aspx?ADID=6984 or call 1-520-415-3558 and enter phone conference identification number 995 062 995#.

For more information about the meeting, please visit the City of Flagstaff website https://www.flagstaff.az.gov

Virtual Public Meeting on September 30

Attend to learn about and provide your comments on the Lone Tree Overpass project. The project team will be available to answer your questions live during the meeting. Register Now!

Project Design is Underway

The project team will use the recommended alignment from the 2010 Lone Tree Overpass Study and the 2020 Final Report Update as the initial design concept. This base concept will be refined, stakeholder coordination will occur, and the right-of-way impacts will be refined. The design will begin in phases and will progress as stakeholder agreements are obtained and design decisions are made with the public and stakeholders.