Loop 303: Happy Valley Parkway to Lake Pleasant Parkway

The Arizona Department of Transportation has initiated a project to add 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 will also be 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 is to improve traffic capacity along Loop 303 between Happy Valley and Lake Pleasant parkways. The project is 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 new roadway will be constructed by the city of Peoria, with construction expected to begin in March 2021.

Construction Timeline

  • Work is scheduled from November 2020 through late 2021/ early 2022.
  • Schedules are subject to change due to weather or other unforeseen conditions.

What to Expect During Construction

  • During the first phase of construction, the existing two lanes of traffic in each direction will be maintained on Loop 303 while the median shoulder is paved for the third lane and new bridges for the future freeway mainline roadway and Jomax Parkway ramps are constructed.
  • In phase two, Loop 303 traffic will be shifted to the new freeway lanes on the inside and the Jomax Parkway improvements will be constructed.
  • ADOT will provide information about restrictions and closures in advance so drivers can plan to use alternate routes and allow extra time.

Questions/Comments

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