You don’t. It is not possible to tell if a flooded low water crossing is safe just by looking at it. Approximately 75% of all flood fatalities occur in vehicles. Shallow water can be deceptively swift and easily wash your vehicle off the road. Water over a roadway can conceal damage to the roadway or supporting structure. You may find that there is no longer a road under the water. When a low water crossing is flooded, don’t chance it. Turn Around - Don’t Drown!