Monroe County, WI — January 21, 2026, a man was injured due to an overturned tanker truck accident sometime in the afternoon along State Highway 33.

According to authorities, a 22-year-old man from Florida was traveling in a tanker truck hauling milk on S.H. 33 near Cashton when the accident took place.

Officials indicate that, for as yet unknown reasons, the truck apparently failed to safely navigate a curve in the road. It was consequently involved in a single-vehicle collision in which it overturned into a roadside ditch.

The driver was entrapped in the wreckage and had to be extricated by emergency personnel. Once freed from the aftermath, he was transported to a local medical facility by EMS so that he could receive treatment for injuries of unknown severity.

Additional details pertaining to this incident—including the identity of the victim—are not available at this point in time. The investigation is currently ongoing.

Commentary by Attorney Michael Grossman

When a tanker truck hauling milk overturns in a rural area, especially while navigating a curve, the key question is whether the truck was operating within the safe limits for that turn. Tankers are inherently less stable than other commercial trucks—particularly when the tank isn’t full. That’s because partially filled tanks allow liquid to surge, shifting weight dramatically during braking or steering.

Given that this was a single-vehicle rollover, investigators will want to determine whether the driver lost control due to excess speed, overcorrection, shifting cargo, or some combination of those factors.

Areas of focus should include:

• Tank fill level and internal baffle configuration, which determine how much liquid motion (or surge) the truck experiences in turns;
• Whether the driver entered the curve at a safe speed, especially given the road’s geometry and any posted advisory signage;
• Roadway conditions, including shoulder drop-off, curve radius, surface grip, and whether the road was wet or uneven;
• Brake and steering system condition, which can affect how well a vehicle responds during curve negotiation;
• Whether the driver had sufficient experience operating tankers, which require different handling than box trailers or dry vans.

I’ve worked on similar cases where milk tankers rolled under circumstances that initially seemed like driver error—only to find that the truck was only one-third full, amplifying instability during a curve. Federal regulations require that tankers be equipped with internal baffles and that drivers be properly trained to account for slosh, but that doesn’t mean it’s always done right.

Key Takeaways:

• Tanker trucks are especially vulnerable to rollover when carrying partial loads, due to liquid surge.
• Safe curve navigation depends on a mix of proper speed, driver training, and tank design (including internal baffles).
• Investigators should analyze vehicle speed, load stability, and road geometry to determine what caused the loss of control.
• Entrapment injuries in rollover cases often signal a high-force event with significant cab deformation.
• Even single-vehicle crashes like this one may reflect preventable issues in cargo handling, vehicle condition, or driver readiness.