The Texas Hill Country has been notorious for flash floods caused by the Guadalupe River. Here's why the area is called "Flash Flood Alley."

There’s been an abnormal amount of extreme rainfall across the United States in recent days. Here’s what’s driving it.

The Guadalupe River has risen to catastrophic levels in the same area three times in the past century, impacting camps and campers each time.

KERRVILLE, Texas (AP) — Rescue crews in Texas kept a wary eye on river levels Monday, hoping to resume the search for people still missing from catastrophic flooding that pummeled the central part of the state earlier this month and killed at least 132 people.

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 loss of more than 100 lives, many of them children, to Hill Country floods over the July Fourth weekend has shaken Texans to the core. Closer to home, at least 16 people have died in floods in the Austin area .More than 170 people are still reported missing.

The Guadalupe River has a history of deadly flooding. Here is a look over the decades. (AP video Marshall Ritzel/Albee Zhang)

The region of Texas where flash flooding killed more than 90 people -- including dozens of campers -- is known for its tendency to experience flood emergencies.

"We will handle this page with the reverence it deserves and hopefully unite owners and loved ones with their belongings," says the FB page.