At least 82 people are dead and at least 41 more are missing after devastating flash floods slammed Texas Hill Country, with water rescues taking place along the Guadalupe River, which rose rapidly early Friday morning to the height of a two-story building.

Parts of the state devastated by flash floods that left at least 82 dead over the holiday weekend were braced for more heavy rains as forecasters extended flood warnings through Monday evening.A summer camp on the banks of the Guadalupe River in the state’s Hill Country said Monday it was grieving the loss of 27 girls and counselors.

Catastrophic flooding struck central Texas on Friday as the Guadalupe River surged by more than 20 to 26 feet within 90 minutes, causing widespread devastation and forcing mass evacuations in Texas Hill Country. At least 80 people have been killed in the floods while others remain missing or displaced and more than 850 people required rescuing.