Riggs Road Traffic Interchange at SR 347

Overview

The Arizona Department of Transportation (ADOT), in partnership with the Gila River Indian Community, Maricopa Association of Governments (MAG), and in coordination with the Bureau of Indian Affairs, has initiated a study for a proposed traffic interchange at Riggs Road and State Route (SR) 347 to address traffic congestion and safety. 

This study follows a study conducted by MAG on the SR 347 Corridor, which identified the need to separate SR 347 from Riggs Road traffic on a new bridge. The study will evaluate alternatives for the interchange design and identify the preferred alternatives in a Design Concept Report and environmental document.

Fact Sheet - English

Fact Sheet - Spanish

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Purpose

• Provide free-flowing traffic movements along SR 347 as it passes Riggs Road.
• Reconstruct the existing intersection to separate SR 347 from Riggs Road traffic on a new bridge.

Need

• Reduce traffic congestion and travel times.
• Reduce crash rates at the intersection.
• Enhance regional mobility.

Alternatives Being Considered

The study evaluated a range of interchange alternatives to separate SR 347 from Riggs Road traffic on a new bridge, including the following types:

Following agency and public scoping, the project team evaluated and refined the alternatives to two proposed design alternatives for public input.

Riggs Road Traffic Interchange Alternative A2

The Riggs Road Traffic Interchange Alternative A2 (pictured above) is a spread diamond interchange, which is similar to standard diamond interchange, but the southbound on- and off-ramps are pushed to the west to avoid  the GRIC Utility Authority (GRICUA) substation. In this alternative, Riggs Road traffic goes over SR 347 on a bridge. This alternative requires a pathway to be built for access to the utility substation that would go under the southbound off-ramp.

Riggs Road Traffic Interchange Alternative B1

The Riggs Road Traffic Interchange Alternative B1 (pictured above) is a tight diamond interchange, which is similar to a standard diamond interchange, with SR 347 shifted to the east to avoid the GRICUA substation. In this alternative, SR 347 highway traffic goes over Riggs Road on a new bridge, with the on- and off-ramps at existing grade. This alternative has improved access to the utility substation and requires fewer acres of right-of-way than the A2 alternative.

Aug. 15 In-Person Public Meeting

The Arizona Department of Transportation and its project partners held an in-person meeting on proposed improvements to the SR 347 corridor, between I-10 and the city of Maricopa, on Thursday, Aug. 15. The project team shared project details and were on hand to discuss the proposed improvements for the Riggs Road traffic interchange, as well as the SR 347 corridor widening, and answer questions.

Documents

Public Meeting Presentation (English)

Public Meeting Script (English)

Public Meeting Display Boards (English)

Public Meeting Presentation (Spanish)

Public Meeting Script (Spanish)

Public Meeting Display Boards (Spanish)

Project Videos

Schedule

The study will conclude in late 2024 and design is expected to begin in early 2025. Construction is anticipated to begin in late 2027 and take approximately 12-18 months to complete.

Pictured below: A bird's-eye view of the existing Riggs Rd. and SR 347 intersection.

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