Flash Flood Alley starts with thin soil and steep creek country

West of IH-35, rocky slopes and tight creek beds move hard rain downhill fast. Water may come from a storm far upstream. A dry yard or quiet road can change in a short time.

For a land check, start with FEMA's map. Then ask Hays County about local studies, drainage, nearby crossings, and permits. Some maps are old. New roads and growth can change where water moves.

During a flood alert, do not walk down to inspect the creek. Follow current local alerts. Move to high ground when told, and never test water over a road.