Loop 303: Happy Valley Parkway to Lake Pleasant Parkway

The Arizona Department of Transportation completed this project in January 2022. The project added a third lane in both directions along Loop 303 between Happy Valley and Lake Pleasant parkways. New bridges over the Beardsley Canal and Jomax Parkway also were constructed, as well as a new Loop 303 traffic interchange for the future Jomax Parkway in Peoria.

Project Area Map

Happy Valley Parkways to Lake Pleasant Parkway and Jomax Road Study Map

About the Project

The purpose of the project was to improve traffic capacity along Loop 303 between Happy Valley and Lake Pleasant parkways. The project was funded in part by Proposition 400, a regional sales tax approved by Maricopa County voters in 2004.

Project Elements

  • Constructing a third general purpose lane in each direction by widening in the median.
  • Constructing new bridges over the Beardsley Canal and Jomax Parkway for the new section of the Loop 303 freeway mainline.
  • Constructing the Jomax Parkway Traffic Interchange, which will connect to the future extension of Jomax Parkway west of Loop 303 to Vistancia Boulevard. The city of Peoria began construction on the new roadway in March 2021.

Construction Timeline

  • Work began in November 2020 and was completed in January 2022.

Jomax Parkway Traffic Interchange Opens

Jomax Parkway Traffic Interchange, November 2021

Loop 303 - Jomax Parkway Interchange and Beardsley Canal bridge January 2022

Jomax Parkway Traffic Interchange, Fall 2021

Loop 303 and Jomax Parkway Traffic Interchange

Crews install girders at the Jomax Parkway bridge, May 2021

Loop 303 and Jomax Rd Girder Set 050621

Crews work at the Jomax Parkway bridge, March 2021

Loop 303 - Jomax Bridge Work March 2021


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

  • By email: Subscribe to receive project updates and traffic alerts.
  • By phone: Call the ADOT Bilingual Project Information Line at 855.712.8530.
  • Online: Submit a question or comment through the ADOT website. Visit azdot.gov/Contact and then select Projects from the dropdown menu.
  • By mail: Write to ADOT Community Relations, 1655 W. Jackson St., MD 126F, Phoenix, AZ 85007