PHOENIX — The Arizona Department of Transportation (ADOT) is advancing the next phase of the State Route 347 (SR 347) Improvement Project, selecting Sundt Construction as the highest-ranked contractor and beginning negotiations for pre-construction services.
The $396 million transportation infrastructure project will modernize a 15-mile section of SR 347 between Interstate 10 and the City of Maricopa, a vital commuter corridor serving Maricopa and Pinal counties. The route passes largely through the Gila River Indian Community and is one of the region’s most heavily traveled roadways.
Construction is expected to begin this summer and continue for approximately three years, significantly improving traffic flow, safety, and long-term capacity.
Contractor Selection and Project Delivery
Following a comprehensive evaluation process, Sundt Construction was chosen to enter negotiations with ADOT, which are expected to conclude in February. Through early contractor involvement, Sundt will provide constructability expertise, cost analysis, and scheduling input as the project’s final design phase moves forward.
Planned SR 347 Improvements
Key improvements planned under the SR 347 project include:
- Adding one travel lane in each direction from I-10 to the City of Maricopa
- Rehabilitating existing pavement along the entire 15-mile corridor
- Building grade-separated interchanges at Riggs Road and Mammoth Way
- Adding turn lanes and intersection upgrades at Casa Blanca Road and Maricopa Road
Once completed, the project is expected to reduce congestion, increase roadway capacity, and enhance overall traffic safety, supporting the growing transportation needs of southern Arizona.
Funding and Regional Impact
Project funding is provided by the State of Arizona, Maricopa Association of Governments, City of Maricopa, and Pinal County. The SR 347 Improvement Project does not include federal funding.
ADOT officials said the project represents a major investment in regional mobility, economic development, and connectivity, supporting continued growth south of the Phoenix metropolitan area.
