Loop 303 from Interstate 10 to Proposed State Route 30

Loop 303 from Interstate 10 to Proposed State Route 30

The environmental study began in 2005 and was put on hold in 2007 because of economic conditions.  In 2013, ADOT and the Federal Highway Administration reinitiated the study of Loop 303 south of Van Buren Street to SR 30. Construction of Loop 303 south of Interstate 10 to Van Buren Street was completed in October 2017. The Environmental Assessment for the section of Loop 303 from Van Buren Street to MC 85 received a Finding of No Significant Impact in November 2018. View the Final Environmental Assessment and Design Concept Report.

Loop 303 has been planned to accommodate an ultimate configuration of four general-purpose lanes and one high-occupancy vehicle (HOV) lane in each direction. There is no date set for Loop 303 south of I-10 to be designed and constructed to its ultimate configuration.

Need more information?
Telephone: Call the ADOT Project Information Line at 855.712.8530
Online: Submit a question or comment online (select Projects from the drop-down menu)
Mail: ADOT Communications
1655 W. Jackson Street MD 126F
Phoenix, AZ 85007


Study Timeline

  • Draft Environmental Assessment and Design Concept Report - Spring 2018
  • Public Hearing - Summer 2018
  • Final Environmental Assessment and Design Concept Report - Fall 2018
  • Final design and construction: Final design is scheduled to begin Summer 2021; construction start date has not been determined.



Alternative 2C South

Loop 303 South of Van Buren St. to the proposed State Route 30

Study Map

Loop 303 Interstate 10 to State Route 30 Study map


Documents - Loop 303 from I-10 to Proposed SR 30



Virtual Tour

Loop 303 Virtual Tour


Flyover and Drive-through Videos