Fourth-Lockett Roundabout Project

Project Overview

The Arizona Department of Transportation (ADOT) will administer the design and construction, including advertising and awarding the construction contract, of a roundabout to replace the signalized intersection at Fourth Street and Cedar Avenue/ Lockett Road. This roadway safety improvement project is the result of the City submitting a grant application to ADOT in 2018 for a competitive Highway Safety Improvement Program (HSIP) award. This project was identified as a high priority through a local network crash data screening process.

The roundabout will improve safety, slow speeds, help avoid angle crashes, and will add a crosswalk at the fourth-leg of the intersection. Pedestrian Actuated Rapid Flashing Beacons will be installed at all crossings.

Construction will occur during 2025 and a full closure of the Fourth St/Cedar Ave/Lockett Rd is anticipated during the 2025 summer school break, with associated detour routes in place. Franchise Utility relocations, in advance of roundabout construction have been ongoing and will be completed this winter. Right of Way acquisitions have been completed, including the single-family residence at 2207 E Lockett Road, which will be demolished this fall/winter.


Plan Snip

The City Council approved an Intergovernmental Agreement (IGA) between the City of Flagstaff and ADOT for this project on May 19th, 2020.  The IGA directs ADOT to administer the design and construction and to advertise, bid and award the project. The total HSIP Federal Funding was $1,928,367 and the total City funding was estimated to be $60,813.

The City Council approved IGA Amendment No. One on April 5th, 2022, which incorporated additional design scope to ensure the project fully mitigates impacts to surrounding properties, added a City of Flagstaff role during construction inspections, and updated project costs based on the most recent estimates. IGA Amendment No. One identified an immediate need for additional City funding in the amount of $73,000 for additional design scope and project administration costs, increased the estimated City share for right-of-way acquisition costs by $500,000, and updated the City share of estimated construction costs to $1,614,225.   The total project cost is estimated at $4,176,405. The total City financial commitment is currently estimated at $2,248,038. The City is responsible for any project costs in excess of the current HSIP grant award of $1,928,367.

The City Council approved the Ordinance 2022-13 allowing for the acquisition of real property and the determination and offers of relocation benefits to persons displaced to make way for the Fourth Street/Cedar Avenue/Lockett Road roundabout project on June 7th, 2022.

Previous City Council Meetings: