Rescue operations were underway to find anyone lost in the debris after the catastrophic weekend storm, which caused the sprawling Guadalupe River to swell rapidly to near-unprecedented levels.

Hope of finding survivors of the catastrophic flooding in Texas dimmed Tuesday, a day after the death toll surpassed 100, and crews kept up the search for people missing in the aftermath.

Cruz described the Texas Hill Country and the Guadalupe River and said that yesterday when he saw it, the river was “peaceful” but that “the morning of July 4, it rose with a ferocity that the cabins...