Maps show how heavy rainfall and rocky terrain helped create the devastating Texas floods that have killed more than 120 people.

Crews are digging through mountains of debris along the Guadalupe River as they continue their desperate search

President Donald Trump toured the devastation left by flash flooding in central Texas amid growing questions about how local officials responded to the crisis as well as questions about the federal response -- including the fate of the Federal Emergency Management Agency -- that he has so far avoided.

Shock has turned into grief across Texas where at least 120 people have died from flash floods and more were missing as the search for victims moved methodically along endless miles of rivers and rubble Thursday.