SR 347 Corridor Widening, I-10 to city of Maricopa

SR 347 Corridor Widening, I-10 to city of Maricopa



The Arizona Department of Transportation, in partnership with the Gila River Indian Community and Maricopa Association of Governments, is proposing to construct improvements along SR 347, between Interstate 10 (I-10) and the northern limits of the city of Maricopa.


Project Elements

The project team will evaluate:

  • Widening SR 347 by one lane in each direction, primarily toward the median (or outside – where required) from the city of Maricopa Limits (MP 175.7) to I-10 (MP 189.1).
  • Widening existing bridges at Santa Rosa Wash, Santa Cruz Wash and Gila River.
  • Extending box/pipe culverts as needed.
  • Intersection improvements at Casa Blanca Road, Borgia Road (Sacate Road), Mammoth Way (Cement Plant Access Road) and Old Maricopa Road to accommodate a six lane highway.
    • Casa Blanca Road and Mammoth Way Intersections: Additional modifications to  improve traffic flow and safety are planned at these two intersections. (These improvements will take place on a different timeline than the other project elements.)


Project Area

SR 347 Corridor Widening Intersections Map


Design Schedule

The corridor widening is currently in design and is expected to take two years to complete. It is not currently funded for construction. If funding becomes available, it is expected to advertise for construction in summer 2025.

The intersection improvement project for the Casa Blanca Road and Mammoth Way (Cement Plant Access Road) intersections is funded for construction. Design is underway and it is anticipated to advertise for construction in spring 2025.


Public Input

The public will have an opportunity to provide input. Information on public involvement opportunities will be posted to the website once they are finalized.


Stay Informed


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ADOT welcomes your questions and comments. Please contact us in any of these ways:

  • By Phone: ADOT Project Information Line: 855.712.8530
    Teléfono: Línea de Información del Proyecto de ADOT: 855.712.8530
  • Email: [email protected]
  • By Mail: ADOT Communications, 1655 W. Jackson St., MD 126F, Phoenix, AZ 85007