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."

Nearly a week after floodwaters swept away more than a hundred lives, Texas officials are facing heated questions over how much was – or was not – done in the early morning hours of Friday as a wall of water raced down the Guadalupe River.

At least 120 people have died and some 173 people remain unaccounted for statewide, nearly a week after flash floods ravaged the Texas Hill Country.

The Guadalupe River in Texas surged 26 feet in just 45 minutes. No one saw it coming - What began as a routine flood developed into a deadly disaster, with the death toll now in triple digits

Authorities confirmed Wednesday that 120 people have died in the central Texas floods. Follow for live updates.

Flash floods surged through in the middle of the night, but many local officials appeared unaware of the unfolding catastrophe, initially leaving people near the river on their own.

Recordings provided to CBS News showed first responders asking for an emergency alert to be sent, but dispatchers delayed because they needed special authorization.

Satellite images are providing a clearer picture of the devastation brought by the deadly flooding in Central Texas over the July Fourth weekend.  More than 100 people were killed and over 160 remained missing as of Tuesday evening,