I-10 Loop 202 to State Route 387 Wild Horse Pass Corridor

Project Overview

The 26-mile stretch of Interstate 10 between Loop 202 (Santan/South Mountain Freeway) in south Phoenix and State Route 387 near Casa Grande, also known as the Wild Horse Pass Corridor, is a major commuter route, a freight thoroughfare, and connects the Gila River Indian Community to vital services in Maricopa and Pinal Counties.

Arizona Department of Transportation (ADOT) and partnering agencies are preparing to reduce congestion and increase safety along the corridor by adding an additional general-purpose lane in each direction between Loop 202 to State Route 387, which will make the entire corridor between Phoenix and Tucson three lanes in each direction. High Occupancy Vehicle (HOV) lanes will also be extended in each direction from Loop 202 to Riggs Road.

The proposed implementation plan is consistent with the I-10 Final Environmental Assessment, which was approved in February 2024.

ADOT, in collaboration with the Federal Highway Administration (FHWA), the Gila River Indian Community, the Bureau of Indian Affairs (BIA), and the Maricopa Association of Governments are working closely together to fully fund each project segment which in its entirety costs a little more than $1 billion.

ADOT has also initiated a reevaluation of the I-10 Wild Horse Pass Environmental Assessment (EA) to add a new traffic interchange (TI) on the I-10 at approximately Koli Road. The new interchange on I-10 would be located approximately halfway between the existing Wild Horse Pass Boulevard/Sundust Road and Queen Creek Road/SR 347 TIs. Visit the I-10/Koli Road Traffic Interchange Study website for more information.

Construction Updates

Updated: 1/2024

Construction on the I-10 Bridges Over the Gila River Project is expected to begin later in 2024 and last approximately two years.