SR 347/Riggs Road traffic interchange project moves to design phase

The Arizona Department of Transportation (ADOT) has selected the design for reconstruction of the Riggs Road intersection at State Route 347 to separate traffic on a new bridge. This decision follows extensive agency and public involvement on potential design concept alternatives for the interchange, including public meetings in August 2024. The project is now in the final design phase.

The project will raise SR 347 on a new bridge over Riggs Road to provide free-flowing traffic movements  at this location. SR 347 on- and off-ramps with traffic signals will provide access to and from Riggs Road. The project is designed to enhance safety, reduce traffic congestion and improve travel times to enhance regional mobility. 

The project is a partnership between ADOT, the Gila River Indian Community and the Maricopa Association of Governments, in coordination with the Bureau of Indian Affairs.

Below: A rendering of the selected design, which features SR 347 traffic traveling over Riggs

The selected design, presented in the August public meetings as Alternative B1, is a tight diamond design where the on- and off-ramps are in a diamond shape. The key elements of this design are:

• SR 347 traffic will travel on a new bridge over Riggs Road, which will remain at grade level.
• SR 347 will be shifted to the east and Riggs Road will be shifted to the south to avoid the Gila River Indian Community electrical substation.
• SR 347 will have two lanes in each direction; however, the project will be designed and constructed to allow for future widening to three lanes in each direction.
• Riggs Road will have two lanes in each direction at the intersection, as well as a left-turn and right-turn lane in each direction to access SR 347.

The final Design Concept Report (DCR), which features the design concept for the interchange,  is available on the project webpage.

The project is expected to complete design and be ready to advertise for construction by early 2026. 

For more information, visit  the project website, https://azdot.gov/projects/central-district-projects/riggs-road-traffic-interchange-at-sr-347.

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Schedules are subject to change based on weather and other unforeseen factors. For more information, please call the ADOT Bilingual Project Information Line at 855.712.8530 or go to azdot.gov/contact and select Projects from the drop-down menu. For real-time highway conditions statewide, visit ADOT's Traveler Information Site at www.az511.gov, download the AZ511 app or call 511. Need to know where a milepost is? Click on the "Mile Markers" icon on the map at at www.az511.gov.