Texas flooding updates: Over 130 dead as flash flood threat increases in Texas

Texas Sen. Ted Cruz said 10 girls and one counselor from Camp Mystic are still unaccounted for.

"The pain and agony of not knowing your child's whereabouts, it's the worst thing imaginable," he said.

Parents were dropping off their children at camp, knowing "your child is going to be swimming and canoes and horseback riding and doing archery and making lifetime friends," he said. "And then suddenly it turns to tragedy."

"Last week, we were picking up our daughter from camp here in Hunt. Our girls have gone to camp here for a decade," he said.

The statewide death toll has climbed to at least 82, according to Texas Sen. Ted Cruz.

"Texas is grieving right now. The pain, the shock of what has transpired these last few days has broken the heart of our state," he said.

In hard-hit Kerr County, 75 people, including 27 children, have died in the flooding, officials said Monday.

Search and rescue efforts are ongoing, officials said.

Life-threatening flooding is looming in Llano County, Texas, located about 60 miles north of the devastating Kerr County floods.

A "considerable" flash flood warning has been issued. The ground is fully saturated, so the falling rain is headed straight to runoff and into rivers and creeks, allowing for flash flooding to begin immediately.

-ABC News’ Kenton Gewecke