Interstate 10: Houghton Road Traffic Interchange

The Interstate 10/Houghton Road traffic interchange is being reconstructed to improve traffic operations.

I-10 Houghton Diverging Diamond Map

Key elements of the project:

  • Construct a new, wider Houghton Road bridge over I-10 just west of the existing bridge
  • Widen Houghton Road to three lanes in each direction through the new interchange
  • Reconfigure the interchange as a Diverging Diamond Interchange (DDI)
  • Realign Rocket Road on the north side of the interchange
  • Improve accessibility for bicycles and pedestrians

The project will connect to the new improvements north of I-10 constructed by the city of Tucson.

Business access will be maintained throughout the project.


The I-10/Houghton Road traffic interchange reconstruction project began in late August 2020 and will extend through late 2021.

Traffic Restrictions

Work is being staged to keep the existing Houghton Road bridge and ramps open to the greatest extent possible.

  • Overnight lane reductions and traffic shifts on I-10
  • Occasional overnight closures of Houghton Road and the ramps connecting I-10/Houghton Road
  • Closure of both I-10 ramps on the east side of Houghton Road (ramps from Houghton Road to eastbound I-10 and from westbound I-10 to Houghton Road) from late August to late November 2020
  • Lane shifts throughout the work zone


The Arizona Department of Transportation (ADOT), in partnership with the Federal Highway Administration (FHWA), initiated a design concept study and related environmental studies to evaluate an interchange reconstruction at Houghton Road and I-10 in Tucson, Arizona.

Considerable growth is anticipated along the I-10 corridor in the coming years, with projections indicating volumes will increase by 50% by 2045. Similarly, Houghton Road expects substantial increases in traffic, with projections showing a 500% increase north of I-10 and 200% increase south of I-10. The reconstructed interchange will provide relief for motorists accessing existing and planned residential and business developments in the surrounding areas.

The Design Concept Report was completed in April 2018.

Stay Informed

Schedules are subject to change based on weather and other unforeseen factors. Subscribe to receive project updates and traffic alerts by email. For more information, please call the ADOT Bilingual Project Information Line at 855.712.8530 or submit a question or comment by email.  For real-time highway conditions statewide, visit ADOT’s Traveler Information Site at, follow ADOT on Twitter (@ArizonaDOT) or call 511, except while driving.