Traffic Alerts - Loop 303: Happy Valley Parkway to Lake Pleasant Parkway

Loop 303 between Happy Valley and Lone Mountain parkways closed overnight Monday and Tuesday to prepare for new project construction - November 25, 2020

The Arizona Department of Transportation advises drivers who use Loop 303 in the far Northwest Valley of overnight closures planned Monday, Nov. 30 and Tuesday, Dec. 1 between Happy Valley and Lone Mountain parkways for construction crews to establish traffic control for a new Loop 303improvement project in this area.

  • Northbound Loop 303 will be closed from 10 p.m. on Monday, Nov. 30 until 5 a.m. Tuesday, Dec. 1. Detour: Through traffic on Loop 303 can exit to eastbound Happy Valley Parkway to northbound Lake Pleasant Parkway to re-enter northbound Loop 303.
  • Southbound Loop 303 will be closed from 10 p.m. on Tuesday, Dec. 1 until 5 a.m. on Wednesday, Dec. 2. Detour: Through traffic on Loop 303 can exit to southbound Lake Pleasant Parkway and use westbound Happy Valley Parkway to re-enter southbound Loop 303.

Following these overnight restrictions, the inside shoulders along Loop 303 will be restricted for approximately 12 months during construction of Loop 303 improvements between Happy Valley and Lake Pleasant parkways. Improvements include:

  • 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.

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 and new bridges for the future mainline roadway and Jomax Parkway ramps are constructed. In phase two, Loop 303 traffic will be shifted to the new mainline on the inside and the Jomax Parkway improvements will be constructed.