US 93, I-40 West Kingman Traffic Interchange Project

Kingman Study Area Map

The Arizona Department of Transportation (ADOT), in coordination with the Federal Highway Administration (FHWA), initiated a study process in 2007 to investigate ways for improving traffic flow at the junction of Interstate 40 and US 93 in west Kingman. In January 2019, ADOT began design efforts to implement the study process recommendations.


ADOT has monitored the increased traffic growth and congestion in west Kingman that has occurred over the years. The traffic volume is more than the current diamond interchange is designed to accommodate. 

In 2007, a feasibility study was initiated, and alternatives for a new system traffic interchange were identified. The proposed traffic interchange design includes a free-flowing connection between the two freeways without stopping at the ramp intersection. The new traffic interchange is being is designed to accommodate both current and projected traffic volumes for this area for the next 25 years. The Final Feasibility Report was completed, which identified a preferred improvement corridor.

In 2009, the preferred improvement corridor was further refined into a series of specific alignment alternatives. These alternatives were shared with the public, and our agency stakeholders, where a Most Favorable Alternative was developed.  This information was completed and summarized in a Design Concept Report (DCR) in 2015.

Initial Design / Concept Refinement

ADOT has initiated final design and is now completing an environmental review of the new system interchange improvements. This process follows the National Environmental Policy Act (NEPA). In this effort, the Most Favorable Alternative that was included in the DCR is being refined with feedback from the city of Kingman, Mohave County, and local stakeholders adjacent to the West Kingman corridor. With the design process now advanced to the 30% stage, the footprint and impacts of the system interchange can be assessed. The proposed improvements are currently being evaluated for potential environmental, social and economic issues. 

The environmental clearance is scheduled to be completed in mid-2020. The findings will be incorporated into the preferred alternative, and ADOT will complete the final design phase (see Construction Timeline)

ADOT held an inter-agency stakeholder meeting as well as a public stakeholder meeting with downtown Kingman businesses in July 2019. The project team presented updates of the study to the Kingman City Council and Mohave County Board of Supervisors at the governing bodies’ regularly scheduled meetings on Feb. 18, 2020.

Public Hearing 

Upon completion of the draft environmental assessment, ADOT representatives will present its preferred alternative at a public hearing in mid-May, 2020. The public hearing will provide residents and other stakeholders the opportunity to provide input on the study’s findings and learn more about the interchange design and expected construction impacts. Details of the public hearing will be coming soon.

Construction Timeline

ADOT does not have the funds to build all of the improvements of a full system interchange at one time. Thus, the project will be separated into two phases, with the ramps between Phoenix and Las Vegas constructed first. Phase II will construct the ramps between Las Vegas and California, when the traffic demands suggest the improvements are needed, and when the funding can better be programmed. At all times, all directional movements will be provided.

Phase 1 of the project is currently included in ADOT's 5-year plan for construction to begin in late 2023/early 2024. The new $66 million interchange will help reduce traffic congestion by allowing motorists on US 93 to continue eastbound - without having to go through Beale Street. Conversely, motorists on I-40 heading to Las Vegas will continue westbound without having to go through Beale Street. Drivers will still be given the option to exit both highways at Beale Street to access local businesses, US 66, and downtown Kingman. 

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