Stalled in High Water on the Southwest Freeway? Here's What to Do

You're rolling south on the Southwest Freeway after a hard afternoon downpour, the traffic ahead slows, and the dip under the next overpass is suddenly a brown pond you can't judge the depth of. This is one of the most common ways Houston drivers get into trouble during storm season — and right now, with rounds of heavy rain and flash-flood alerts moving through the metro, the underpasses on US-59/69 are exactly where it happens.

Why the Southwest Freeway floods so fast

US-59 runs low through much of southwest Houston, and its underpasses — especially around the 610 Loop interchange and the spur into downtown — sit below the surrounding grade. When a thunderstorm dumps rain faster than the storm drains can move it, water pools in those dips first. A lane that was clear ten minutes ago can be axle-deep before you reach it. The water is almost always deeper than it looks from the driver's seat, and it can hide a stalled car, debris, or a washed-out edge underneath.

The National Weather Service has a phrase for this that's worth taking literally: Turn Around, Don't Drown. Most flood deaths in Texas happen in vehicles, and it takes far less water than people expect — roughly a foot of moving water can float a car.

If the water's rising and you're still moving

The safest moment to make a good decision is before you're in it.

If you can't see the pavement under the water, treat it as too deep and don't enter.
Don't follow the car ahead in blindly. It may make it through a spot you won't.
Take the frontage road or the next exit and find higher ground. The detour is always faster than a tow and a flooded engine.
Never drive around barricades. They're placed where the road is already known to be underwater.

If your car stalls in the water

If you misjudged it and the engine cuts out, stay calm and act quickly:

Don't try to restart it. More on that below — this is the single most expensive mistake.
Judge whether the water is still rising. If it's shallow, stable, and you can safely step out onto solid ground, leave the vehicle and get to higher ground.
If water is rising fast around the car, get out immediately — through a window if the doors won't open against the water pressure — and move to higher ground. A car is replaceable.
Once you're safe, call for help and note your location: the nearest exit, cross street, or which underpass you're stuck under so a truck can find you.

Never restart a flooded engine

When water gets pulled into the engine's air intake, it reaches the cylinders — and water doesn't compress the way air and fuel do. Cranking the engine in that situation can bend connecting rods or crack the block, a condition called hydrolock. A car that might have only needed to dry out can turn into a wrecked engine the moment you turn the key. If your car died in standing water, leave it off and have it towed somewhere dry where it can be inspected.

When to call a tow

If your vehicle stalled in high water, sat in a flooded underpass, or you're stranded somewhere with no safe way to move it, that's a tow — not a restart-and-hope. The same goes for any breakdown on a Houston freeway shoulder during a storm, where visibility is low and traffic is moving faster than it should. Get yourself to a safe spot away from the lanes first, then let a truck handle the car.

All Houston Towing is available 24/7 across the Houston metro for storm-season recoveries and roadside help. If high water leaves you stranded on US-59 or anywhere else, call us at (713) 999-4141.