The data also highlights critical risks in other areas along the Guadalupe River in Kerr County, revealing more than twice as many Americans live in flood prone areas than FEMA's maps show.

At least 19 of the cabins at Camp Mystic were located in designated flood zones, including some in an area deemed “extremely hazardous” by the county.

The thunder and lighting came to Camp Mystic first, but that was normal. The storm and the driving rain at the Texas camp woke up some of the campers, including Georgia and Eloise Jones, at about 1 a.m. on July 4. At first the pair thought nothing of it, they told ABC News. After all, it had been raining on and off for days.

Follow live updates in the Texas floods, where the death toll has surpassed 100 as the search for survivors goes on.

Scott Ruskan, a Coast Guard swimmer, is credited with saving 165 people at the all-girls’ camp from deadly floods in Central Texas.