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Final Federal Environmental Assessment Approved

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General Stakeholder Engagement

General

The Wild Horse Pass Corridor projects are on a 26-mile portion of I-10 between Loop 202 (Santan/South Mountain Freeway) in south Phoenix and SR 387 near Casa Grande.

The purpose of the I-10 Wild Horse Pass Corridor program of projects is to increase capacity by widening the Interstate 10 from two travel lanes to three travel lanes along a 26-mile stretch in each direction across the Gila River Community (the Community) between Loop 202 (Santan/South Mountain Freeway) in south Phoenix and SR 387 near Casa Grande. The program will also extend the HOV lanes in each direction from Loop 202 to Riggs Road.

The project will also address capacity and operational concerns at the interchanges and crossroads along the corridor.

A third general-purpose travel lane will be added in each direction of I-10 throughout the entire 26-mile corridor. A High Occupancy Vehicle (HOV) travel lane will also be added between Loop 202 and Riggs Road. Additionally, there will be the construction of one new interchange and reconstruction of several existing interchanges and crossroads, as well as improvements to infrastructure throughout the corridor.

Benefits of the projects include:

  • Increased Capacity
  • Increased Safety
  • New and Improved Interchanges and Crossroads
  • Updated Infrastructure

The Wild Horse Pass Corridor will be improved in four project segments, each with its own construction timeline.

The I-10 Gila River Indian Community Project runs for 11.8 miles from Loop 202 (Santan/South Mountain Freeway) at milepost 161 to the I-10 Bridges over the Gila River Project at milepost 172.8. The improvements include:

  • the construction of a third general-purpose lane in each direction in the median of I-10
  • one HOV lane in each direction in the median from Loop 202 to Riggs Road
  • reconstruction of interchanges at Wild Horse Pass Boulevard/Sundust Road, Queen Creek Road/SR 347, and Riggs Road, including the addition of sidewalks
  • reconstruction and widening of the Goodyear Road crossroad
  • several other infrastructure improvements, including freeway management systems that use a fiber optic backbone, cameras, and dynamic message signs.
  • installation of full freeway lighting from Loop 202 to Riggs Road

Construction for this project segment is anticipated to begin in late 2025 and end in early 2028. This segment would cost approximately $450.3 million.

The I-10 Bridges over the Gila River Project spans approximately one mile from milepost 172.8 to milepost 173.8. The improvements will include:

  • replacing the existing two-lane bridges with new three-lane bridges
  • reconstructing the existing two-lane roadway approaches as three lane roadways in each direction.

Construction for this project segment is anticipated to begin in 2024 and last two and a half years. A construction award was made on January 12, 2024 after a winning bid of $50.9 million was received for construction costs. 

Gila River to Gasline Road covers 3.2 miles between mileposts 173.8 and 177.0. Improvements include:

  • addition of a third general-purpose lane in each direction in the median of I-10
  • reconstruction of the existing interchange at Casa Blanca Road/SR 587
  • reconstruction and widening of the Nelson Road bridge and crossroad
  • other infrastructure improvements, including freeway management systems that use a fiber optic backbone, cameras, and dynamic message signs.

Construction for this segment is anticipated to begin in late 2026 and end in mid-2028. This segment is expected to cost an estimated $152.6 million.

Gasline Road to south of State Route 387 runs 10 miles, from milepost 177 to milepost 187. Improvements include:

  • construction of a third general-purpose lane in each direction in the median of I-10
  • a new interchange at Seed Farm Road to improve access for the Gila River Indian Community
  • reconstruction of the existing interchange at Pinal Avenue/SR387/SR187
  • reconstruction and widening of the Gasline Road bridge and crossroad
  • removal of the Dirk Lay Road crossroad bridge structure
  • other infrastructure improvements, including freeway management systems that use a fiber optic backbone, cameras, and dynamic message signs.

Construction for this segment is anticipated to begin in late 2025 and last two years. This segment has an estimated cost of $284.0 million.

  • The I-10 Gila River Indian Community Project is anticipated to begin in late 2025 and last until 2028.
  • The I-10 Bridges over the Gila River Project is anticipated to begin in 2024 and last until 2026.
  • Gila River to Gasline Road is anticipated to begin in late 2026 and last until 2028.
  • Gasline Road to south of State Route 387 is anticipated to begin in late 2025 and last until 2027.

All schedules are subject to change.

Yes, some of the project segments will overlap.

The Corridor projects in their entirety will cost a little more than $1 billion.

Funding will come from both the state and federal level, in addition to an Infrastructure for Rebuilding America (INFRA) grant from the U.S. Department of Transportation. ADOT continues to work closely with the Gila River Indian Community and the Maricopa Association of Governments (MAG) to identify other funding opportunities. 

Not currently. The I-10/Koli Road Traffic Interchange Study is part of a separate ADOT study.

ADOT began the Wild Horse Pass Corridor Study in 2019. The Final Environmental Assessment and Design Concept Report were issued in February 2024.

Construction impacts will be minimized or avoided to the greatest extent possible throughout the duration of this project. However, travelers may still experience the impact of narrowed lanes and shoulders, short-term closures or restrictions of I-10, ramps, or crossroads, and construction dust and noise. Travelers should anticipate delays and periodic lane restrictions throughout the duration of the project.

Traffic diverting from I-10 to other roads occurs for many reasons including but not limited to traffic incidents and construction. Both adding one additional lane and widening the inside and outside shoulders on each side of I-10 in this corridor are expected to reduce freeway closures and restrictions caused by either traffic incidents or construction.

Stakeholder Engagement

You can contact the project team in the following ways: