The catastrophic floods in Central Texas took a mental and physical toll on survivors and first responders. CBS News correspondent Jason Allen spoke to the program director for Texas Search and Rescue,

In Kerr County, the hardest-hit region, officials said the number of missing remained unchanged, at 161, since Tuesday. The floods have killed at least 121 people statewide.

Flash floods last week in Texas caused the Guadalupe River to rise dramatically, reaching three stories high in just two hours

Some camps in the region had to be evacuated, and local newspapers described how Camp Mystic was among those cut off from the outside world. According to a Kerr County history book, floodwaters at Camp Mystic almost reached the top of the dining hall’s stairs.

The survival of people in local camps and low-lying areas depended not on official evacuations but on whether they were paying attention, on their own, to weather alerts in the middle of the night.