Phoenix Metro Area Projects

Loop 303 Improvement Project: North of Interstate 10

Project Timeline

2012

ADOT opened bids for construction of two additional segments in the spring: from Thomas to Camelback roads and from Glendale to Peoria avenues. Construction on both sections is scheduled to begin in the summer. The bid opening for a third section, between Camelback Road and Glendale Avenue, is scheduled for late summer.

2011

In March, construction of the crossroad improvements at Bell, Waddell and Cactus roads was complete. In May, 14 miles of Loop 303 opened between I-17 and Happy Valley Parkway. Construction began on six miles between Mountain View Boulevard and Peoria Avenue in August and on the traffic interchange at I-10 in December.

2009

The federal government approved the Environmental Assessment and issued a Finding of No Significant Impact (FONSI), allowing construction to begin. Work began between I-17 and Happy Valley Parkway. Construction also began on crossroad improvements in anticipation of traffic interchanges at the Loop 303 alignment and Bell, Waddell and Cactus roads.

2008

ADOT published its draft Environmental Assessment for Loop 303 from I-10 to US 60 and held a series of public hearings.

2007

ADOT completed a state-level Environmental Assessment for Loop 303 between Happy Valley Parkway and 43rd Avenue. A federal-level Environmental Assessment also was completed for Loop 303 between 43rd Avenue and I-17.

2006

ADOT reassumed operation and maintenance of Loop 303.

2004

Maricopa County voters approved Proposition 400 to extend the half-cent sales tax for 20 years. The extension would take effect in 2006 and will expire in 2026.

2001

Maricopa County, which was responsible for the operation and maintenance of Loop 303 at that time, completed the first Environmental Assessment and held public scoping meetings.

1985

Maricopa County voters approved a half-cent sales tax through Proposition 300 to fund the MAG Regional Transportation Plan (RTP). The Loop 303 corridor was included in the Voter Pamphlet.

1984

The Maricopa Association of Governments (MAG) identified the need for a West Valley regional connector freeway.