Loop 303

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Arizona Loop 303 is the outer loop of the Phoenix metro area, serving as a bypass of the West Valley. The 36.03 mile route connects Interstate 10 at Goodyear with I-17 in northern reaches of Phoenix. Loop 303 begins at an at-grade intersection with Van Buren Street south of a multi level interchange with I-10, and proceeds north along a six to eight lane freeway to U.S. 60 at Surprise. The freeway then follows a stair-stepped course through Peoria and northwestern reaches of Phoenix, ending at I-17 opposite Sonoran Desert Drive. Loop 303 doubles as the Bob Stump Memorial Parkway its entire length.

Loop 303 was added to the state highway system in 1985 as part of the 1985 Freeway plan, with a final corridor designation in 1988. The interim two-lane roadway was completed in 1991 from Interstate 10 to U.S. 60.

In 1993, due to the funding shortfall, Loop 303 was slated for removal from the state highway system. Maricopa County went to the Arizona Department of Transportation (ADOT), and offered to maintain and construct the roadway to preserve the route, as long as the road remained in the state highway system. MCDOT (Maricopa County Department of Transportation) maintained the roadway from 1995 to 2006, and extended the completed section northeast to Happy Valley Parkway by 2004.

Following the passage of Proposition 400, ADOT resumed maintenance of the highway, and started work on the final link from Happy Valley Road to Interstate 17. Construction on the interim freeway began in 2009, and was completed in 2011. Loop 303 was constructed as a four lane freeway, with through lanes utilizing the future exit ramps.

Built in phases, the four level interchange with Interstate 10 was finished by October 2017 when the final $64 million project connecting the four remaining ramps of the exchange was completed.1

Future plans call for a four mile southern extension of Loop 303 from Van Buren Street to the proposed State Route 30 freeway. With construction originally set for Fall 2020, the project has been indefinitely delayed.2

Arizona Loop 303 North

Cotton Lane defaults to Arizona Loop 303 ahead of Van Buren Street (Exit 103).
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The four level exchange with Interstate 10 was completed in phases, with the last phase done by Fall 2017.
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Glendale Avenue (Exit 109) connects the Bob Stump Memorial Parkway (Loop 303) with Citrus Park in 2.25 miles.
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A single lane ramp departs for Northern Parkway (Exit 112) to Luke AFB and Northern Avenue.
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Confirming marker posted beyond the ingress ramp from Cactus Road (Exit 113).
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Arizona Loop 303 north passes under Bell Road (Exit 116) 2.5 miles ahead of U.S. 60 (Grand Avenue) to Glendale and Wickenburg.
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Loop 303 begins its northeast turn at the Clearview Road overpass.
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The ensuing stretch of Arizona Loop 303 beyond U.S. 60 (Grand Avenue) opened to traffic by 2004.
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Happy Valley Parkway (Exit 125) joins Loop 303 (Bob Stump Memorial Parkway) with the city of Peoria in one mile.
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Arizona Loop 303 bends north parallel to the Agua Fria (Cold Water) River ahead of Exit 125 (Happy Valley Parkway).
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Arizona Loop 303 north advances from Exit 125 (Happy Valley Parkway) to meet Lone Mountain Parkway next.
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Traffic departs for the single point urban interchange with Lone Mountain Parkway to the Vistancia residential development.
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Stub-outs exist along this stretch of Arizona Loop 303 for potential future grade separated connections to the freeway.
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Sonoran Desert Drive ties into Loop 303 at the end of the freeway with Interstate 17 ahead.
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Sonoran Desert Drive branches east from I-17 ahead to the Sonoran Foothills neighborhood.
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Interstate 17 (Black Canyon Freeway) joins the cities of Phoenix and Flagstaff.
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I-17 follows the Black Canyon Freeway north to New River and Black Canyon City on the 120 mile course to Flagstaff. I-17 south joins Loop 303 with Downtown Phoenix.
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Arizona Loop 303 concludes as Sonoran Desert Drive stems east 0.9 miles along an arterial roadway to North Valley Parkway.
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Arizona Loop 303 South


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The first confirming marker for Arizona Loop 303 south stands beyond the exchange with Interstate 17 and Sonora Desert Drive.
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Loop 303 is also referenced as the Bob Stump Memorial Parkway, named after the former Arizona congressman.
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Loop 303 curves southwest at the New River crossing.
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Arizona Loop 303 (Bob Stump Memorial Parkway) south enters the city of Peoria ahead of the diamond interchange (Exit 131) with Lake Pleasant Parkway.
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Loop 303 crosses the Agua Fria River ahead of turning southerly to Sun City West on the ensuing stretch.
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Travel lanes shift for a future interchange along southbound Loop 303.
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Arizona Loop 303 re-curves west to line the northern boundary of Sun City West ahead of El Mirage Road (Exit 123).
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Loop 303 advances west to a folded diamond interchange (Exit 119) with U.S. 60 (Grand Avenue) in 3.25 miles.
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U.S. 60 follows Grand Avenue on a northwest course 28.2 miles to Wickenburg and the beginning of U.S. 93.
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Grand Avenue spokes southeast 24.8 miles to its conclusion at 7th Avenue and Van Buren Street west of Downtown. U.S. 60 overlays Grand Avenue to an exchange with I-17 via Thomas Road.
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Southbound Loop 303 travels under Clearview Boulevard one mile out from a single point urban interchange (SPUI) with Bell Road (Exit 116).
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Bell Road extends across the width of the Phoenix metro area, connecting to Frank Lloyd Wright Boulevard in Scottsdale and Sun Valley Parkway to the west of Surprise.
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Loop 303 (Bob Stump Memorial Parkway) advances south from Peoria Avenue (Exit 112) to meet Northern Parkway at a trumpet interchange (Exit 110B) next.
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Traffic leaves Loop 303 south for Northern Parkway at Exit 110B. Northern Parkway extends east as a limited-access expressway to Luke Air Force Base (AFB) and Northern Avenue.
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Bethany Home Road and Camelback Road follow the diamond interchange (Exit 109) with Glendale Avenue along Loop 303 south.
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This confirming marker for Arizona Loop 303 (Bob Stump Memorial Parkway) stands beyond the egress point for Bethany Home Road (Exit 108). The freeway meets Camelback Road (Exit 107) next.
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Arizona Loop 303 (Bob Stump Memorial Parkway) south meets Interstate 10 (Papago Freeway) at a multi-level systems interchange two miles ahead.
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A half-diamond interchange (Exit 105) joins Loop 303 south with Thomas Road west. Thomas Road spurs to Cotton Lane.
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Arizona Loop 303 continues one mile further from the multi-level interchange with Interstate 10 (Exits 104B-A).
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Ramps connecting to the south side of the exchange with I-10 were completed by October 2017. The freeway ends ahead over Van Buren Street.
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The Loop 303 freeway comes to an end ahead at a signalized intersection with Canyon Trails Boulevard and Lilac Street opposite Cotton Lane.
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Lilac Street branches off into residential neighborhoods as Cotton Lane continues south to CR 85.
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Arizona Loop 303 Scenes

Sonoran Desert Drive passes over Skunk Creek on the half-mile drive to Interstate 17 and Arizona Loop 303 west to Peoria and Surprise.
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Bell Road meets Loop 303 ahead of the Surprise Village Marketplace and Sarival Road. Locally, Loop 303 extends south to Greenway Road and north to U.S. 60 at Surprise.
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Sources:
  1. "I-10, Loop 303 interchange in Goodyear now open to drivers", Arizona Central, October 10, 2017.
  2. Timeline - Loop 303 from Interstate 10 to Proposed State Route 30, ADOT website.


Photo Credits:

03/02/19 by AARoads

Connect with:
Interstate 10
Interstate 17
U.S. 60
Northern Parkway

Page Updated 06-06-2020.