A Third of I-8's Truck Crash Deaths Came on the Miles Near Casa Grande

The Finding

I-8 runs about 179 miles from the Colorado River at Yuma to I-10 just south of Casa Grande. It’s the freight line between Southern California and the rest of the Sun Belt, and for most of its length it crosses open desert.

From 2015 to 2024, 20 fatal crashes involving a large truck happened on I-8 in Arizona. They killed 21 people.

Most of those miles are empty. The deaths aren’t spread evenly across them.

A third of the deaths came on the 29 miles from the SR 84 exit, where traffic comes in from Stanfield and Maricopa, to the I-10 interchange. That’s about a sixth of the road.

How I Counted

The fatal crash records come from the National Highway Traffic Safety Administration’s Fatality Analysis Reporting System, the federal census of every fatal crash on a US public road. I kept Arizona crashes from 2015 to 2024 that involved a large truck and that police recorded on I-8.

Each crash went onto the map by its recorded latitude and longitude, measured against the Arizona Department of Transportation’s own mileposts. One crash had no usable coordinates and was placed by the milepost police recorded.

Twenty-one deaths is a small number to judge a road by. So I added ADOT’s own crash records, which AZ Law Now obtained through a public records request. They cover every reported crash on a state highway, not only the fatal ones.

From the ADOT file I took I-8 mainline crashes from 2015 to 2024 that involved a medium or heavy truck and hurt at least one person. ADOT’s count of fatal truck crashes on I-8 matches the federal count exactly, at 20.

To compare stretches fairly, I measured crashes against truck miles traveled. Those come from ADOT’s 2024 counts for the federal highway inventory, held constant across the decade, so treat each rate as an estimate.

Three Times the Death Rate

I split I-8 into five stretches using towns and junctions along the way. The last one, from the SR 84 exit to I-10, stands apart.

It ran about 2.13 deaths per 100 million truck miles. The rest of I-8 ran about 0.67. No other stretch topped 0.93.

Source: NHTSA FARS 2015-2024. ADOT HPMS 2024 truck AADT. Rates are estimates. Computed by AZ Law Now.

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The 35 miles just west, from Gila Bend to the SR 84 exit, carry a bigger share of trucks. Yet they saw a single fatal truck crash in ten years. The danger isn’t simply the number of semis.

Where the Desert Ends

What changes near Casa Grande is everything around the trucks. West of SR 84, I-8 has few exits and light local traffic. In the last 29 miles there are six exits before the I-10 interchange.

ADOT counts about 7,000 vehicles a day on I-8 west of the SR 84 exit. Near Casa Grande the count reaches about 12,000. Trucks make up roughly a third of it, and ADOT’s inventory shows two lanes each way the whole distance.

Four of the 6 fatal truck crashes on this stretch happened in the dark. They range from a 2021 crash involving four vehicles and a rolled truck to a midnight angle crash in 2024 that killed two people riding in another vehicle.

Source: ADOT crash records and NHTSA FARS 2015-2024, located on ADOT mileposts. Computed by AZ Law Now.

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The Injury Records Agree

ADOT’s records show the same miles carrying far more than their share of truck injury crashes.

From 2015 to 2024, the state logged 44 truck crashes that injured someone between the SR 84 exit and I-10. They hurt 63 people, 8 of them seriously. For the truck traffic it carries, the stretch logged about 13.4 injury crashes per 100 million truck miles, roughly double the rest of I-8.

Trucks were involved in 44 of the 101 injury crashes of any kind on that stretch. On Arizona’s state highways as a whole, trucks are in about 1 in 9 injury crashes.

The federal truck crash file, which counts any reported truck crash with an injury, a death, or a tow, shows the same pattern. Its rate near Casa Grande runs about 60% above the rest of I-8.

Truck Deaths Rose as Other Deaths Fell

Across all of I-8, fatal large-truck crashes killed 8 people from 2015 to 2019 and 13 from 2020 to 2024.

Over the same years, deaths in every other kind of fatal crash on I-8 fell, from 39 to 23. Trucks went from about 1 in 6 I-8 traffic deaths to more than 1 in 3.

These are small numbers, and a single crash can swing them. But the direction matches what we found on I-10 between Phoenix and Tucson, where truck crash deaths rose 76%.

Most of the Dead Weren’t in the Truck

Of the 21 people killed in I-8 fatal truck crashes, 13 were outside the truck. Twelve were driving or riding in another vehicle, and one was on foot. Another 11 people survived with injuries, 4 of them suspected serious.

ADOT’s broader records tell the same story. Of the 276 people hurt in I-8 truck crashes over the decade, 143 were outside the truck.

Eight truck occupants also died. Three of them were alone in a truck that left the road and rolled at night in the open desert between Yuma and Gila Bend.

Bad Days in the Middle Miles

The desert miles between Dateland and Gila Bend logged some of I-8’s worst injury crashes. In October 2021, a same-direction sideswipe involving a truck east of Dateland left 7 people seriously injured, all outside the truck.

A month later, at dawn on November 4, 2021, ADOT recorded four separate truck crashes within three minutes at the same milepost between Dateland and Gila Bend. Together they seriously injured 5 people.

Trucks From Out of State

I-8 is a through route. In the federal crash file, about 35% of I-8 truck crashes involved a carrier based in California, and about 25% one based in Arizona.

Statewide, Arizona carriers account for about 47% of reported truck crashes and California carriers about 15%. On I-8, roughly 3 in 4 crashes involved a carrier headquartered somewhere else.

Inspection records point to the condition of the trucks themselves. Inspectors logged 9,968 detailed inspections in the three years ending September 2026 at Yuma, Gila Bend, and other I-8 locations. About 31.6% of trucks were ordered off the road for a vehicle defect, against 26.2% everywhere else in Arizona.

What This Means

On I-8, the people hurt and killed in truck crashes are mostly in the cars and pickups sharing the road. Near Casa Grande, that means commuters and local drivers merging into two lanes already carrying long-haul freight.

A crash involving an out-of-state truck can pull in a carrier in another state, a freight broker, a shipper, and an insurer that has never set foot in Arizona. The police report, the truck’s electronic data, the driver’s hours-of-service logs, and the inspection history each hold part of the answer.

If a commercial truck hit you or someone in your family on I-8, talk to our truck crash lawyers before you give a statement to the trucking company’s insurer. Our Maricopa truck crash attorneys handle cases across Pinal County, and the first conversation is free.

For a decade, the open desert on I-8 wasn’t where truck crashes killed the most people. The last 29 miles into Casa Grande were.

Related Coverage

For the legal and process context, see Ron DeBrigida’s guide to Arizona truck crash law and Stephanie Ramirez’s truck crash action plan.

Where I-8 ends at I-10, see how I-10 truck crash deaths rose 76% between Phoenix and Tucson. South of Tucson, see why half of I-19’s truck crash deaths came in Green Valley and Sahuarita.

Up north, see where I-17 truck crash deaths cluster past Anthem and Black Canyon City, where I-40 truck crash deaths peak leading into Flagstaff, and why US-93’s deadliest truck miles are north of Wickenburg. Our Arizona truck death surge investigation covers the whole state.