Search teams plodded through mud-laden riverbanks and flew aircraft over the flood-stricken landscape of central Texas for a fourth day on Monday, looking for dozens of people still missing from a disaster that has claimed at least 78 lives.

Amanda Jones of Anderson was camping along the Guadalupe River near Kerrville with her husband, four children, and three dogs when storms began moving through the area late Thursday night. They arrived at their campsite on July 3 around 3 p.m. and had settled in by early evening, pitching their tent roughly 20 yards from a tributary of the river.