Interstate 10 Broadway Curve: Interstate 17 (Split) to Loop 202 (Santan Freeway)


I-10 Broadway Curve Graphic

The Arizona Department of Transportation, in partnership with the Federal Highway Administration and the Maricopa Association of Governments, is studying preliminary concepts for proposed improvements to the I-10 Broadway Curve area between I-17 (Split) and Loop 202 (Santan Freeway). The study team is drafting an Environmental Assessment (EA) that will evaluate the proposed improvements as compared to the no-build alternative which is the condition that would exist if the project was not built.I-10 Broadway Curve Map Graphic

This 11-mile stretch of roadway is a key commerce corridor and has seen increasing levels of traffic over the past few years, especially during the heavily traveled morning and evening peak hours.

Proposed improvements being studied include:

  • Adding general purpose and high occupancy vehicle (HOV) lanes to improve traffic flow
  • Adding a collector-distributor road system to reduce the number of lane changes on the mainline and improve traffic flow
  • Modifying connections between I-10 and the State Route 143 and Broadway Road to improve HOV lane connections and traffic flow at the interchanges
  • Modifying connections of I-10 and US 60 (Superstition Freeway) to improve traffic flow at the interchange
  • Improving drainage along the freeway
  • Constructing new bridges to accommodate new interchange facilities and additional lanes
  • Improving roadway communication technology facilities
  • Building retaining and sound walls
  • Constructing pedestrian bridge crossings to improve pedestrian access across the freeway
  • Relocating utilities

ADOT’s EA is guided by the National Environmental Policy Act (NEPA) of 1969, Council on Environmental Quality (CEQ) regulations, and federal and state environmental process requirements. A Draft EA will be published and made available for public review and comment, with a public hearing anticipated in Late 2019. Following the public review and comment period, a Final EA will be distributed with a selected alternative and a determination of the significance of the impacts will be made. If the Final EA determines that there are no significant impacts associated with the proposed improvements, the project will receive a Finding of No Significant Impact (FONSI).

Project Schedule

Interstate 10 Broadway Curve Project Schedule

If a FONSI is received for this study, the study will move forward into the project development, design and construction process. Construction would begin in late 2020 and could take up to four years to complete.

Business Outreach

The I-10 Broadway Curve corridor provides important roadway connections for thousands of businesses in the area and across the metropolitan Phoenix area.  ADOT will provide business representatives with regular project updates and opportunities to provide input/feedback throughout the project process. More information can be found on Business Outreach.

Public Input

Members of the public will be invited to attend the hearing to learn more about the Draft Environmental Assessment and provide feedback.

More information about providing input to the project is available on Public Outreach.

Stay Informed

Please subscribe to receive study updates by email.  For questions or comments, email [email protected] or call the ADOT Bilingual Project Information Line at 855.712.8530.