The Arizona Department of Transportation is continuing improvements to Loop 303 in the northwest valley. Three projects, stretching from US 60 (Grand Avenue) to Happy Valley Parkway will help improve traffic conditions. During construction, closures and restrictions may occur. Drivers are reminded to slowdown and be alert when traveling in the work zones. DPS officers will periodically patrol the area to enforce the reduced speed limit.
Loop 303: Happy Valley Parkway to El Mirage Road
Construction is currently underway to widen the Loop 303 to three lanes in each direction. It is anticipated that this section of roadwork will be complete in summer 2015. As part of this project, two sound walls are being built on the south side of Loop 303. The roadway improvements will be utilizing material from the existing roadway and have a rubberized asphalt paved surface.
Loop 303 / US 60 (Grand Avenue) Traffic Interchange
Construction on the interchange connection will begin by detouring traffic in December 2014 and will be complete sometime in summer 2016. As part of this project, a new bridge will be constructed on the south side of the existing Loop 303 bridge (serving as the new eastbound travel lanes), sound walls will be constructed north of Mountain View Boulevard along the Loop 303 corridor, and the roadway will receive a layer of rubberized asphalt paving.
Sound walls will be constructed near Sun City Grand in early December 2014 and will take a few months to complete.
Loop 303 / El Mirage Traffic Interchange
Construction will start in early 2015 and is anticipated to be complete in summer 2016.
Frontage Road Update: The I-10 frontage roads connecting to/from Cotton Lane are now open.