Mini Stack

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Freeway interchange in Phoenix, Arizona

title: "Mini Stack" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["buildings-and-structures-in-phoenix,-arizona", "transportation-in-phoenix,-arizona", "interstate-10", "road-interchanges-in-arizona"] description: "Freeway interchange in Phoenix, Arizona" topic_path: "sports" source: "https://en.wikipedia.org/wiki/Mini_Stack" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Freeway interchange in Phoenix, Arizona ::

::data[format=table title="Infobox road junction"]

Field	Value
state	AZ
name	Mini Stack
image	PHX I-10, AZ-51, AZ-202.jpg
image_caption	The Mini Stack, looking north up State Route 51 in 2010.
maint	ADOT
location	Central Phoenix, Arizona
coord
roads

| | type | Stack interchange | ::

|type = Stack interchange |const = |opened = ::figure[src="https://upload.wikimedia.org/wikipedia/commons/e/ef/250620-01_I-10_SR_51_and_SR_202_Mini_Stack_interchange.jpg" caption="Aerial view of the interchange, looking southwest, 2025"] ::

The Mini Stack is the freeway interchange among Interstate 10, State Route 51, and Loop 202 in Phoenix, Arizona, United States, located northeast of downtown. Reconstructed in 2004 to its current setup, the interchange, which is the busiest in the state of Arizona with over 300,000 vehicles per day, provides full directional access between the three freeways, as well as HOV lane connections for southbound SR 51 to eastbound I-10, westbound I-10 to northbound SR 51, westbound Loop 202 to westbound I-10, and eastbound I-10 to eastbound Loop 202.

Description

The interchange constitutes exits 147A-B-C on Interstate 10, the final southbound exits on SR 51, and exit 1A on Loop 202. The Mini Stack serves as the western terminus of Loop 202's Red Mountain Freeway segment and the southern terminus of State Route 51. Interstate 10, the only through-route in this interchange, changes cardinal direction as it passes through the Mini Stack, heading from north to west for westbound travelers and east to south for eastbound travelers.

Delays

In a 2007 study performed by Forbes, the Mini Stack ranked number four in the United States in terms of delays with 22 million hours of delays each year. It was behind only Los Angeles' US 101 and I-405 interchange in California, Houston's I-610 and I-10 interchange in Texas, and Chicago's I-90/I-94 and I-290 interchange in Illinois.

Shooting incidents

Main article: Phoenix freeway shootings

From August to September 2015, the Mini Stack was the spot of a number of shootings, which were connected to a larger string of shootings and other incidents that injured a teenage girl and damaged several vehicles. The Mini Stack was the location of a majority of the shootings. A suspect was later said by Governor Doug Ducey to have been taken into custody.

References

Malone, Robert. "Phoenix I-10 and SR 51 interchange". Forbes.
"State proposes an additional ten lanes for highway". East Valley Tribune.
"Interstate 10 westbound - Maricopa County". AARoads.
(June 11, 2007). "America's 12 Worst Traffic Traps". Forbes.
(September 8, 2015). "DPS investigating 9 possible freeway shootings in Phoenix area". [[Arizona Republic]].
(September 8, 2015). "Source: Phoenix Police Sergeant involved in possible Interstate 10 freeway shooting". [[KNXV-TV]].
(September 8, 2015). "Arizona DPS investigates 9 freeway shooting incidents in 10 days". [[KTAR-FM.
(September 18, 2015). "We got him! DPS SWAT team is in custody of the individual suspected of I-10 shootings. Apprehended moments ago.".
(September 18, 2015). "Ducey: Freeway shooting suspect in custody". ABC 15.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::