When the Dry Creek Is Not Dry: Flooded Roads and Low-Water Crossings

For most of the year, the creek beds that some county roads dip through are dry gravel. That is exactly the problem: people stop thinking of them as water crossings at all. When a winter storm parks over the mountains, those dips can fill within an hour, and a familiar road becomes a stretch nobody can see the bottom of.

What the County tells drivers

The County's public works storm guidance is blunt. Stay away from flooded rivers and streams, and do not try to cross flooded intersections or low-water crossings if you cannot see the roadway. You have no idea how deep the water is, or whether the crossing is even still intact. A small amount of water moving fast enough can sweep a vehicle and its occupants off the road and downstream. In its own words: if you have to ask "Can I make it?", don't even try.

The same guidance asks drivers in storms to watch for boulders loosened from hillsides and for falling trees, especially in high winds and at night. Its flood advice adds: do not walk, swim or drive through a flooded area, and if your car is stuck in floodwater, abandon it as fast as possible and get to higher ground.

Why the depth is impossible to judge

The County's evacuation plan says most vehicles can be swept away by less than two feet of moving water. The DMV handbook lists what else is hiding under the surface: floating debris, a road that has collapsed, a vehicle malfunction mid-crossing, and electrocution risk where power lines are down. It also notes you cannot tell depth by looking. If there is another route, take it. If you truly have none and the water is shallow and still, drive slowly, and test your brakes once you are through.

It is not only a back-country problem

City underpasses, low intersections and streets beside storm channels flood in heavy rain too, often during the commute. The same rule applies on a suburban street as on a rural creek crossing: if you cannot see the road surface, you do not know what is under it. Turn around and find another way.

What water does to a car

Water drawn into the engine can wreck it in an instant, and water that reaches the cabin floor commonly gets into wiring, modules and seat electronics. If your car has been in deep water, do not try to restart it; restarting can turn a repair into a write-off. Have it towed and tell the insurer exactly how high the water came.

How flood damage is covered

Flood and water damage to your own car is generally handled under comprehensive coverage, not collision, which means it is covered only if you carry comprehensive. A liability-only policy pays nothing for your car. Cars with serious water damage are often declared total losses, and a flood history can follow a car onto its title — worth remembering if you are the one buying a used car after a wet winter. How a particular claim is handled, including any exclusions in your policy's wording, varies by insurance company.

If you drive the back roads in winter, check whether your policy includes comprehensive; it is the coverage that answers this kind of day.