More than 850 people have been rescued, including some who were clinging to trees, after a sudden storm on Friday dumped up to 38cm of rain in an area around the Guadalupe River, about 140km northwest of San Antonio.
Among the missing were 27 girls from the Camp Mystic summer camp after river waters rapidly rose nine metres, Kerrville city manager Dalton Rice said at a press conference on Saturday evening, and there may be others beyond that.
"We are kind of looking at this in two ways called the known missing, which is the 27 ... We will not put a number on the other side because we just don't know," Rice said.
"We know that the rivers rise, but nobody saw this coming," said Kerr County Judge Rob Kelly, the top local official in the region.
Kerr County Sheriff Larry Leitha said eight of the confirmed dead, including three children, had yet to be identified.
The US National Weather Service said the flash flood emergency has largely ended for Kerr County, following thunderstorms that dumped more than a 30cm of rain. That is half of the total the region sees in a typical year. A flood watch remained in effect for the broader region.
Kerr County sits in the Texas Hill Country, a rural area known for rugged terrain, historic towns and tourist attractions.
Texas Lieutenant Governor Dan Patrick said an unknown number of visitors had come to the area for an Independence Day celebration by the river.
"We don't know how many people were in tents on the side, in small trailers by the side, in rented homes by the side," he said on Fox News Live.
Camp Mystic had 700 girls in residence at the time of the flood, according to Patrick. Another girls' camp, Heart O' the Hills, said on its website that co-owner Jane Ragsdale had died in the flood but no campers had been present as it was between sessions.
Texas Governor Greg Abbott said at a news briefing that he had asked President Donald Trump to sign a disaster declaration, which would unlock federal aid for those affected.Â
Earlier on Saturday, Trump said he and his wife Melania were praying for the victims.
"Our Brave First Responders are on site doing what they do best," he said on social media.
Trump has previously outlined plans to scale back the federal government's role in responding to natural disasters, leaving states to shoulder more of the burden themselves.
Videos posted online showed bare concrete platforms where homes used to stand and piles of rubble along the banks of the river. Rescuers plucked residents from rooftops and trees, sometimes forming human chains to fetch people from the floodwater, local media reported.
Local officials said the extreme flooding struck before dawn on Friday with little or no warning, precluding authorities from issuing advance evacuation orders as the Guadalupe River swiftly rose above major flood stage in less than two hours.
The US administration has cut thousands of jobs from the National Weather Service's parent agency, the National Oceanic and Atmospheric Administration, leaving many weather offices understaffed, said former NOAA director Rick Spinrad.
He said he did not know if those staff cuts factored into the lack of advance warning for the extreme Texas flooding, but said they would inevitably degrade the agency's ability to deliver accurate and timely forecasts.
"People's ability to prepare for these storms will be compromised. It undoubtedly means that additional lives will be lost and probably more property damage," he said.
with reuters
