Loop 303, Lake Pleasant Parkway to I-17 Improvements

The Arizona Department of Transportation, in association with the Maricopa Association of Governments, and in coordination with the Federal Highway Administration and the cities of Phoenix and Peoria, has initiated a study to consider an additional general-purpose lane on Loop 303 between Lake Pleasant Parkway and Interstate 17, as well as possible future traffic interchanges on Loop 303 at 67th, 51st and 43rd avenues. The study will also determine the approximate timing of the implementation of the I-17/Loop 303 system interchange ramps. The project seeks to address growing traffic demands on Loop 303.

L303 Lake Pleasant TI Map

Project Elements

This project will provide an update to the 2006 Final Design Concept Report Estrella Freeway (Loop 303), Happy Valley Road to I-17. Currently the segment of Loop 303 from Lake Pleasant Parkway to I-17 provides two lanes in each direction of travel. The project will consider the addition of a third general-purpose lane in each direction of travel, as well as develop and evaluate service interchange alternatives at 67th, 51st and 43rd avenues, and the implementation timing of the direct connecting ramps at the I-17/Loop 303 system interchange.


  • The project is currently in the study phase for the general-purpose lane widening. Construction of the 51st Avenue and 43rd Avenue traffic interchanges began in September 2022 and is anticipated to finish in late 2023.
  • Timing of the construction of the remaining elements of the project is to be determined.
  • Schedules are subject to change.

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  • By Phone: ADOT Bilingual Project Information Line: 855.712.8530
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  • By Mail: ADOT Communications, 1655 W. Jackson St., MD 126F, Phoenix, AZ 85007