The flash flooding on the Guadalupe River in Central Texas has killed at least 104 people. Local officials in Kerr County said Sunday that 10 girls and one counselor from Camp Mystic, an all-girls’ Christian summer camp, are still missing.

The death toll is expected to rise.

On Monday, Mayor Joe Herring Jr. of Kerrville, the county seat, said rescue crews would push forward with their searches, slashing through debris and downed trees even as they braced for the possibility of more downpours and flash flooding. “This will be a rough week,” Mr. Herring said at a news conference, later adding, “We need your prayers.”

Here’s what we know about some of those who were killed.

Jeff Wilson, a longtime high school teacher in suburban Houston, was killed in the flood while camping near the river with his wife, Amber, and their 12-year-old son, Shiloh, according to several friends, people at the school where he worked, and his brother-in-law John Dustin Ledford.

The family had been in the area for the Kerrville Open Pro Rodeo, where his son, a third-generation cowboy, had been set to compete on Friday in the bareback/saddle/mini bronc riding event. As they often did, they had traveled to the rodeo in their truck with a camper set atop it, so they would not have to pay for a hotel.

Jeff WilsonCredit…Kathleen Ortiz

On social media on Saturday, Mr. Ledford said that he was able to locate the family’s truck in the water, but the family was not in it and the camper was nowhere to be seen. He added that Ms. Wilson and Shiloh are still missing and asked for prayers.

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