Arizona State Route 303

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State Loop 303 marker

State Loop 303
Estrella Freeway
Loop 303 highlighted in red
Route information
Maintained by ADOT
Length35.25 mi[1] (56.73 km)
HistoryPartially complete, under construction until after 2025
Major junctions
FromVan Buren Street in Goodyear
To I-17 in Phoenix
Highway system
  • Arizona State Highway System
Arizona 289.svg SR 289Arizona 347.svg SR 347
Route 303 interchange with Interstate 10 in Goodyear, Arizona, looking north along 303, with Luke Air Force Base in the right background

State Route 303, also known as Loop 303, the Estrella Freeway, or the Bob Stump Memorial Parkway, is a freeway that serves the northwestern portion of the Phoenix area. The freeway, originally a two-lane rural highway, was maintained by Maricopa County[2] in central Arizona serving the far western suburbs of the Phoenix metropolitan area until 2004 when the Arizona Department of Transportation again took control of upgrading the interim road to a freeway. In 2004, it was renamed "Bob Stump Memorial Parkway" to honor former Arizona congressman Bob Stump.[3]

Route description[edit]

Loop 303 currently begins at Van Buren Street,[4] south of I-10 in Goodyear and at I-10 becomes a six-lane freeway with a stack interchange.[5] South of Van Buren Street it continues as Cotton Lane but without a route number. It heads north under McDowell and Thomas Roads, then over an interchange with Indian School Road. The road heads through a farmland terrain and passes the Wildlife World Zoo near Northern Avenue. It over passes a BNSF Railway spur line near Olive Avenue.[6] At an interchange with Greenway Road, Route 303 enters a residential community and turns northeast. The route heads over a bridge above Grand Avenue (US 60) along with another BNSF railroad line.[6] The route turns eastward and was recently upgraded to a six-lane freeway.[7] It turns north near the Happy Valley Parkway interchange and then east again south of Lake Pleasant, passing through planned arterial interchanges. The freeway comes to an end at a temporary at-grade interchange (eventually to be a stack interchange) with I-17 near Skunk Creek. East of this interchange, Route 303 becomes Sonoran Desert Drive. The south end from US 60 to I-10 is frequently used to bypass Grand Avenue and quickly move from Grand Avenue to Bell Road.[8]


Old colored Arizona Loop 303 shield that has been phased out.

Loop 303 was originally a part of the 1985 Maricopa County Regional Transportation Plan that was funded by a sales tax approved by Maricopa County voters. The freeway, designed to service the Northwest Valley, was originally designated SR 517 in 1985; the Loop 303 designation was first assigned on December 18, 1987.[9] The freeway was scheduled to be completed sometime by 2005. However, funding shortfalls and increasing construction costs forced cutbacks in the plan, and in 1995 the freeway was dropped from the regional plans.

Maricopa County took charge of what was then called the Estrella Freeway project when it was dropped from the regional freeway plans, maintaining it as an interim two-lane highway along the original corridor while keeping the state route designation. The county then made significant improvements to the roadway, extending it several miles north and east of US 60. While the highway was still largely a two-lane rural road, the extension north of US 60 along with the southern terminus just north of Interstate 10 was upgraded to a four-lane divided parkway, and the segment between US 60 and Bell Road in Surprise was partially upgraded to controlled-highway standards with overpasses and right-of-way for on-ramps.[10]

With the extension of the sales tax approved in 2004, the highway was once again added to the Regional Transportation Plan. As Maricopa County had completed much of the required study and preparation work, construction on the freeway proceeded with a planned completion date of the I-10 to I-17 segment by 2015. According to an agreement between the state legislature and the state department of transportation, STAN (Statewide Transportation Acceleration Needs) funds were used to build a partial interchange at Bell Road in summer 2010, several years before previously intended.[11] In mid-2011 the segment between Happy Valley Parkway and I-17 was completed as a four-lane highway with an interchange at Lone Mountain Parkway completed but initially closed to the public. Motorists still have to pass through signaled ramp junctions at the I-17 Black Canyon Freeway until a full stack interchange is built between that route and Loop 303.


Long-term plans call for the extension of Loop 303 south of the interchange with I-10 in Goodyear to the planned I-10 'Reliever Route' Freeway, SR 30. In response to a projected budget shortfall of $6.6 billion brought on by the recession, the Maricopa Association of Governments voted to suspend funding to numerous projects during a meeting on October 28, 2009. Some modifications to Route 303, such as a scaled-back design of its interchanges with I-10 and US Highway 60, were made to cope with the budget shortfall. Funding for the extension south of I-10 to the planned alignment of SR 30 was removed, effectively postponing the extension until after 2025.[12]

Exit list[edit]

The entire route is in Maricopa County.

Goodyear0.000.0099 SR 30 (Tres Rios Freeway) – YumaPlanned interchange; to be signed as exits 99A (east) and 99B (west); Loop 303 will go south of SR-30 in the future after Loop 303 from I-10 to SR-30 is completed.
1.101.77100Elwood Street / Cotton LanePlanned interchange; to be southbound exit and northbound entrance
2.103.38102Yuma Road / Lower Buckeye RoadPlanned interchange; no planned northbound signage for Lower Buckeye Rd.
3.205.15103Van Buren Street / McDowell RoadNorthbound exit and southbound entrance; temporary counterclockwise terminus
104 I-10 – Phoenix, Los AngelesStack interchange; signed as exits 104A (east) and 104B (west); exit 124 on I-10
5.198.35105Thomas Road / McDowell RoadSouthbound exit and northbound entrance
6.179.93106Indian School Road
GoodyearGlendale line7.1911.57107Camelback Road
Glendale8.1913.18108Bethany Home Road
9.2014.81109Glendale Avenue
10.1816.38110ANorthern AvenueNorthbound exit and southbound entrance
10.6817.19110BNorthern Parkway eastTrumpet interchange; west end of Northern Pkwy.
111Olive AvenuePlanned Southbound exit and northern entrance
GlendaleSurprise line12.1819.60112Peoria Avenue
Surprise13.1821.21113Cactus Road
14.1822.82114Waddell Road
15.1824.43115Greenway Road
16.1826.04116Bell Road
19.2931.04119 US 60 (Grand Avenue)Parclo interchange
Sun City West23.6838.11123El Mirage Road
25.6841.33125Happy Valley Parkway / Vistancia BoulevardHappy Valley Pkwy. was routing of Temporary Loop 303 before parkway's maintenance was turned over to Maricopa County
Peoria26.8843.26126Jomax ParkwayInterchange currently under construction with completetion date of late 2021/early 2022
27.9845.03127Lone Mountain Parkway
29.1846.96128Westwing ParkwayPlanned interchange
30.6849.37130Westland DrivePlanned Interchange
31.7851.14131Lake Pleasant Parkway
Phoenix34.5855.65133Pyramid Peak ParkwayPlanned interchange
36.7859.19135Stetson Valley ParkwayPlanned interchange
37.6860.6413643rd AvenuePlanned interchange
38.6862.2513735th AvenuePlanned interchange with frontage roads
39.2563.17138 I-17 – Flagstaff, PhoenixClockwise terminus; at-grade intersection with frontage roads (future stack interchange); exit 221 on I-17; continues east as Sonoran Desert Drive
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also[edit]


  1. ^ a b Roadway Inventory Management Section, Multimodal Planning Division (December 31, 2013). "2013 State Highway System Log" (PDF). Arizona Department of Transportation. Retrieved January 16, 2016.
  2. ^ "MCDOT Rightroads Program".
  3. ^ "Maricopa County Board of Supervisors minute book" (PDF). Archived from the original (PDF) on 2007-09-30. Retrieved 2007-06-06.
  4. ^ "I-10, Loop 303 interchange in Goodyear now open to drivers".
  5. ^ "ADOT Opens At More Ramps at 303 and I-10 interchange".
  6. ^ a b Arizona Railroads (PDF) (Map). Cartography by Multimodal Planning Division. Arizona Department of Transportation. September 2011. Retrieved April 9, 2012. CS1 maint: discouraged parameter (link)
  7. ^ "Loop 303 project page ADOT".
  8. ^ Google (April 9, 2012). "SR 303" (Map). Google Maps. Google. Retrieved April 9, 2012.
  9. ^ Breyer, Joe. "Right-of-Way Resolutions - Route Number: 517". Arizona Highway Data. Works Consulting LLC. Retrieved March 2, 2016. CS1 maint: discouraged parameter (link)
  10. ^ "Loop 303 (North of I-10)". ADOT. Retrieved 2008-02-02. CS1 maint: discouraged parameter (link)
  11. ^ "L303 Overview". ADOT. Retrieved 2008-02-02. CS1 maint: discouraged parameter (link)
  12. ^ Holstege, Sean (2009-10-29). "Valley freeway projects shelved". The Arizona Republic. Retrieved 2009-11-04. CS1 maint: discouraged parameter (link)
  13. ^ Google (January 16, 2016). "Bob Stump Memorial Parkway" (Map). Google Maps. Google. Retrieved January 16, 2016.
  14. ^ WSP (November 2018). "SR303L, SR30 TO I-10 LOCATION/DESIGN CONCEPT REPORT" (PDF). ADOT. Arizona Department of Transportation. pp. 246–255. Retrieved March 11, 2021.
  15. ^ "Framework study" (PDF).

External links[edit]

Route map:

KML is from Wikidata