Loop 303 begins in north Phoenix at I-17 near Skunk Creek and ends at the northern edge of Goodyear at West Van Buren Street. Construction is now underway to extend the freeway farther south into the city to Maricopa County Route 85.
It is expected to help relieve traffic on I-10 and set up an eventual connection with a new planned freeway — State Route 30 — which is scheduled for construction from 2027 through 2046.
The state says the four-mile extension of Loop 303 into Goodyear will take around four years to complete. There will be three lanes going in either direction, connected by 10 overpass bridges and walled with sound barriers for adjacent neighborhoods.
The $613 million project is paid for through the Maricopa Association of Governments’ regional freeway plan, approved by voters in 2004.
In an appearance on ADOT’s podcast, “On The Road with ADOT,” the department’s senior engineer, Jimmy Naujokaitis, said “this is going to be the terminus of the Loop 303. Eventually, within the coming years, we are going to be starting construction on State Route 30.”
State Route 30 is planned as an alternative route to I-10 for drivers commuting between Buckeye and Phoenix in the West Valley.
According to ADOT’s project website, here’s a timeline for the Loop 303 extension:
- Clearing work along the corridor began in June.
- Earthwork and soil compaction to prepare for the freeway will begin later this month. Work will start at Elwood Street and move north, then work will proceed southbound.
- North- and southbound traffic will then be shifted onto the new frontage road and work will begin on the new freeway.
- Construction of the new northbound frontage road will then start and is expected to be completed in fall 2027.
- The project is expected to be completed in 2030.
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