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.

Over the last decade, an array of local and state agencies have missed opportunities to fund a flood warning system intended to avert the type of disaster that swept away dozens of youth campers and others in Kerr County,

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.

Secretary of Homeland Security Kristi Noem's voice broke as she recounted her emotional visit to Camp Mystic in Texas.

Flash floods that swept through Texas over the Fourth of July weekend have left more than 100 people dead and dozens of others missing.

"Camp Mystic is grieving the loss of 27 campers and counselors following the catastrophic flooding on the Guadalupe river," started the statement on the website of Camp Mystic for Girls. "Our hearts are broken alongside our families that are enduring this unimaginable tragedy. We are praying for them constantly."

Former Houston appointee Sade Perkins recently came under fire after claiming that Camp Mystic was "White-only" as the Texas camp deals with catastrophic flooding that killed dozens.