Transportation Studies

Loop 303: Happy Valley Parkways to Lake Pleasant Parkway and Jomax Road Study

The Arizona Department of Transportation has initiated a study along a section of Loop 303 in the Northwest Valley to address how future growth in the region would impact the highway. The study will examine the benefits of adding a third general purpose lane in each direction between Happy Valley and Lake Pleasant parkways; constructing a new traffic interchange to tie in with the city of Peoria’s future extension of Jomax Road; and building a new bridge over the Beardsley Canal.

What to Expect:

During the construction phase, shoulder closures along the Loop 303 are anticipated and temporary single-lane closures might be necessary. ADOT would maintain at least one lane of travel  in each direction  while work is underway.


The study is scheduled to last 12 months.

Construction is scheduled to begin in fall 2020. Information about the duration of construction will be provided when a project schedule is confirmed.

Stay Informed:

Please subscribe to receive project updates and traffic alerts by email.

If you have questions or comments, call the ADOT Project Information Line at 855.712.8530 or email

Loop 303  Happy Valley and Lake Pleasant Parkways/Jomax TI Map
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Comment on the Draft EA

There will be several opportunities to provide comments on the Draft EA, and all comment methods are considered equal. At any time during the 30-day public comment period, comments can be provided in several ways.

  • Public Hearing
    May 15, 2014 | 5-8 p.m.
    Presentation at 5:30 p.m.
    El Mirage Senior Center
    14010 N. El Mirage Rd.
    El Mirage, AZ 85335
  • In writing:
    ADOT Bell and Grand Project Team
    1655 W. Jackson St.
    MD 126F
    Phoenix, AZ 85007
  • Online
  • By email:
  • By phone: