Transportation Engineering

I-10/Ina Road Traffic Interchange Improvements | Marana, AZ

Arizona Department of Transportation


Transportation Engineering
Roadway Engineering
Traffic Engineering
Surveying and Mapping
Utility Modifications

$18 Million Saved on CANAMEX Corridor Project

Interstate 10 traverses the northwestern and eastern portions of Pima County and is part of the CANAMEX Corridor. The Arizona Department of Transportation (ADOT), in conjunction with the Federal Highway Administration, identified the need to reconstruct portions of I-10 to increase the roadway capacity and to improve operational efficiency. The Regional Transportation Authority also identified the need to improve the safety of the crossroads through the elimination of at-grade crossings with the Union Pacific Railroad’s mainline tracks.

Psomas designed improvements for the interchange and the widening of I-10 to accommodate a future 10-lane roadway section, new auxiliary lanes, and entrance and exit ramps. The project included three new bridges, MSE walls, significant roadway and cross drainage improvements, traffic signal, ITS, roadway and freeway lighting improvements, and major wet and dry utility relocations and upgrades.

Due to the project’s complexity, unique challenges, and schedule constraints, ADOT proactively utilized the Construction Management at Risk (CMAR) delivery method. Psomas’ design team worked closely with the selected CMAR and, through successful collaboration and partnering efforts, identified and implemented value engineering opportunities that saved $18 million in construction and right-of-way costs.