The purpose of this study is to identify and evaluate alternative routes for the proposed Loop 303 extension between I-10 and the proposed State Route 801.

In 2004, Maricopa County voters approved Proposition 400 which authorized extension of an existing half-cent sales tax to fund transportation improvements defined in the Regional Transportation Plan. This proposed extension of Loop 303 was identified as an element of the Regional Transportation Plan.

This project is one of several projects associated with the passage of Proposition 400, proposed to improve north/south traffic flow in the West Valley. The corridor study area includes the region within the red boundary below. The boundary does not represent a specific alignment or transportation loop, but is the general area under study.

A larger view is available.

Public Scoping Meeting (held) - June 29, 2006
Public Information Meeting (held) - November, 30 2006
Public Information Meeting - November 2007
Public Hearing - Summer 2009
Design and right of way acquisition - 2015-2017
Begin Construction - 2017

Approval by voters in the general election on November 2, 2004 ensured that the half-cent sales tax for transportation would extend for an additional 20 years to 2026 to implement the Regional Transportation Plan.

The planning stage establishes the general location and basic characteristics (number of lanes, interchanges, etc.) of a roadway. Accompanying this are environmental studies (noise, traffic volume, etc.), identification and evaluation of alternatives, general cost estimates, partnering with public and private partners, and the determination of feasibility to move to the design phase.The timeline represents phases that a roadway evolves through. There are a series of studies that are required before a roadway gets built. Once built, a roadway will continually be improved over time as a result of the studies.

Loop 303 South of I-10 is in the beginning of the planning stage. We are currently identifying potential corridors with the establishment of general locations and basic characteristics (number of lanes, interchanges, etc.). Accompanying this are environmental studies (noise, traffic volume, etc.), identification and evaluation of alternatives, general cost estimates, partnering with public and private partners, and the determination of feasibility to move to the design phase.

The design of a roadway involves several phases of detailed engineering and technical review and interim levels of approval. The final design of the roadway is represented in plans and specifications that construction contractors use to prepare construction bids.

Road construction is based on the approved design. As the construction process advances, changes may occur that are influenced by a variety of factors. ADOT continually looks for ways to improve the construction process for maximum efficiency and minimal community impact.

ADOT continually plans for enhancements to the roadway once it is built and in use for maximum efficiency and safety. Various studies identify these enhancements and may influence additional planning, design and construction. Studies for Loop 303 include corridor projects north of I-10 and south of I-10.

The Loop 303 project is funded with the half-cent sales tax under the voter-approved Proposition 400.

Our Valley Freeway System is part of the 2004 voter-approved Regional Transportation Plan. We are working hard with our transit partners to implement the voters’ vision and are committed to quality, safety, open communication with our neighbors, and minimal inconvenience to the traveling public.