$410 million project will improve connectivity and safety along one of Arizona’s most congested commuter routes
02/11/2026 PHOENIX, AZ TSX,NYSE:STN
The Arizona Department of Transportation (ADOT) has selected the Coffman-Fisher design-build team, consisting of Coffman Specialties, Inc., Fisher Sand & Gravel Company, and lead designer Stantec Consulting Services Inc.to deliver the northern segment of the I-10 Wild Horse Pass Corridor improvements project that will enhance safety and mobility between Phoenix and Tucson along I-10.
The project will cover approximately 12 miles of I-10 in Arizona, from Loop 202 to the Gila River Bridges, within the Gila River Indian Community. Improvements will include the addition of one general-purpose lane and one high-occupancy vehicle (HOV) lane in each direction from Loop 202 to south of Riggs Road. They will also include the addition of one general purpose lane in each direction from south of Riggs Road to the Gila River Bridges. Other improvements include interchange modifications at Wild Horse Pass, Queen Creek (SR 347), Riggs Road, a new interchange at Koli Road, and rehabilitation of the Goodyear Road grade separated structure over I-10. Additional enhancements include intelligent transportation systems (ITS), lighting, signals, signing and pavement markings, and drainage improvements throughout the corridor.
The project is a collaboration between ADOT, the Federal Highway Administration (FHWA), the Gila River Indian Community (GRIC), the Bureau of Indian Affairs, and the Maricopa Association of Governments. The total estimated project value for this segment is $410 million, with the overall corridor program valued at roughly $1 billion.
Community and economic impact
The corridor is a major commuter and freight route, connecting the Gila River Indian Community to the Maricopa and Pinal counties and serves as a primary connector to people travelling between Phoenix and Chandler and the bedroom communities through SR 347. The improvements will address longstanding bottleneck issues along the corridor, reduce congestion for up to 126,000 vehicles daily, and enhance safety by adding additional lanes in each direction. The project will also support growth within the Gila River Indian Community, encouraging new development and providing enhanced access to the Wild Horse Pass Resort and Casino. Additionally, ADOT will work with the Tribal Employment Rights Office to create jobs for community members during construction.
“The I-10 corridor serves as a vital connector between Tucson and Phoenix, and we welcome the opportunity to help improve the connectivity of these communities,” said Robert Lemke, senior project manager at Stantec. “Working alongside ADOT and Coffman-Fisher as our design-build partner, we will deliver a safer and more connected commuter experience across Arizona.”
Improving freight movement along this vital corridor will also support Arizona’s economy, especially manufacturing and logistics hubs in Casa Grande and Phoenix. State leaders view this as a key driver for future economic development.
Innovative approach to save costs
In initial planning with ADOT and the project stakeholders, the design-build team created an alternative approach to the originally proposed corridor improvement plans. Replacing the entire stretch of existing asphalt with new concrete pavement will provide a 30-year lifespan at nearly the same cost as new asphalt, resulting in significant long-term maintenance savings for ADOT. This innovation was made possible through the design-build delivery method, allowing for alternative technical concepts and efficient construction phasing.
Stantec has a long history of supporting highway and roadway design across the United States. The firm led design on the Loop 375 Border Highway West Extension Project in El Paso, Texas, a highway project designed to provide better connectivity around the City of El Paso, lessen congestion and make the roadway safer for commuters. The company is also leading design on improvements to the Golden Glades Interchange in Miami-Dade County, Florida, a vital connector in the region.
Learn more about roadway design at Stantec.
About Stantec
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Media Contact
Michael Stevens
Stantec Media Relations
Ph: (509) 957-5262
michael.stevens@stantec.com
Colin Nekolaichuk
Stantec Media Relations
Ph: (416) 542-6049
colin.nekoaichuk@stantec.com
Arizona's I-10 corridor is the main connection between that state's two biggest cities, Tucson and Phoenix.