The general rule is to avoid water deeper than 6 inches for most standard sedans and up to 12 inches for larger vehicles like trucks and SUVs. Driving through deeper water is extremely risky and can cause severe damage to your vehicle. The key is not just the depth but also the water's speed and the road's surface underneath.
The primary danger is engine hydrolock, which occurs when water is sucked into the engine's air intake. Since water cannot be compressed like air, it can cause catastrophic internal engine damage, requiring a full replacement. Other immediate risks include water shorting out electrical systems, contaminating brake components, and causing the vehicle to lose traction and float away.
| Vehicle Type | Maximum Recommended Water Depth | Key Risks |
|---|
| Standard Sedan (e.g., Toyota Camry) | 6 inches (15 cm) | Low air intake, hydrolock risk |
| SUV/Crossover (e.g., Honda CR-V) | 8-10 inches (20-25 cm) | Higher clearance, but similar engine risks |
| Truck/4x4 SUV (e.g., Ford F-150) | 12 inches (30 cm) | Highest clearance, but water can enter differentials |
| Moving Water (Any Vehicle) | AVOID entirely | As little as 6 inches can sweep a car away |
If you must cross shallow, standing water, do so slowly and steadily. First, check the depth using a stick or by observing other objects. Drive in a low gear (like "L" or 1st) and maintain a slow, constant speed to create a small bow wave, but avoid going so fast that you create a large wave that could splash over the hood. Test your brakes lightly immediately after exiting the water to dry them off. The safest strategy is always to find an alternate route.
