KERRVILLE, Texas — With more rain on the way, the risk of life-threatening flooding was still high in central Texas on Monday even as crews search urgently for the missing following a holiday weekend deluge that killed at least 82 people, including children at summer camps. Officials said the death toll was sure to rise.

His optimism was fading. He paused along a Texas 39 grape orchard as friends searched across the highway in a massive field spanning half a mile. Trees once blocked the roadside view. Now, the still-swollen river, a mess of uprooted trees and scattering of volunteer searchers were visible from the road.