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.

Taking swift action, counselors at Camp La Junta in the Texas Hill Country managed to evacuate hundreds of children from a raging flood.

Brooklyn and Bailey McKnight's little sister, Paisley, was at a camp on a smaller arm of the Guadalupe River. The 14-year-old was "just miles" away from Camp Mystic in Central Texas, which has been devastated by the deadly floodwaters spurred by extreme rainfall on July 4.

As floodwaters rose in Texas, camp counselors hoisted children onto rafters, carried them to dry ground and sang with them to keep them calm.

Officials in Texas are facing mounting questions about whether they did enough to get people out of harm’s way before a flash flood swept down the Guadalupe River and killed more than 100 people, including at least 27 children and counselors at an all-girls Christian camp.

Just two days before devastating floods claimed at least 27 lives at Camp Mystic, the Texas Department of State Health Services signed off on the youth camp's emergency plans, according to records obtained by ABC News.

Over 100 bodies have been recovered, but the large number of missing suggested that the full extent of the catastrophe was still unclear five days after the disaster.

Jonathan McComb was the sole family member to survive a Texas flooding in 2015. Now, he's in Kerrville searching for victims in from the latest flooding.