By Rich McKay, Joseph Ax and Andrew Hay
ATLANTA (Reuters) -Tropical Depression Helene brought life-threatening flooding on Friday to wide sections of the U.S. Southeast, where at least 33 people have been killed by a storm that swamped neighborhoods, triggered mudslides, threatened dams and left more than 4 million homes and businesses without power.
In Tennessee, fears that a dam would fail near the city of Newport prompted officials to order the evacuation of the downtown area. Another dam in North Carolina was on the brink of failure.
Before moving north through Georgia and into Tennessee and the Carolinas, Helene hit Florida's Big Bend region as a powerful Category 4 hurricane on Thursday at 11:10 p.m. ET (0310 GMT on Friday) packing 140 mph (225 kph) winds. It left behind a chaotic landscape of overturned boats in harbors, felled trees, submerged cars and flooded streets.
As of early Friday afternoon, the storm had been downgraded to a tropical depression with maximum sustained winds of 35 mph (55 kph), the National Hurricane Center said.
But Helene's heavy rains were still producing catastrophic flooding in many areas, with police and firefighters carrying out thousands of water rescues throughout the affected states.
More than 50 people were trapped on the roof of a hospital at midday on Friday in Unicoi County, Tennessee, about 120 miles northeast of Knoxville, as floodwaters swamped the rural community. State officials later said those people were safely rescued.
Rising waters from the Nolichucky River were preventing ambulances and emergency vehicles from evacuating patients and others there, the Unicoi County Emergency Management Agency said on social media. Emergency crews in boats and helicopters were conducting rescues.
Elsewhere in Tennessee, Rob Mathis, the mayor of Cocke County, wrote on social media that the Walters dam "has suffered a catastrophic failure" and that the downtown area of the nearby city of Newport, with 36,000 people, would evacuate.
However, the Tennessee Emergency Management Agency wrote on social media that the Walters dam, which is located just across state lines in North Carolina, had not failed. The agency said that information came from Duke Energy, which operates the dam.
Madison McDonald, a Duke Energy spokesperson, said, "we are aware of the situation and we're sorting out the facts."
In western North Carolina, Rutherford County emergency officials warned residents near the Lake Lure Dam to immediately evacuate to higher ground, saying "Dam failure imminent."
In nearby Buncombe County, landslides forced interstates 40 and 26 to close, the county said on X.
The extent of the damage in Florida began emerging after daybreak.
In coastal Steinhatchee, a storm surge - the wall of seawater pushed ashore by winds - of eight to 10 feet (2.4-3 meters) moved mobile homes, the NWS said on X. In Treasure Island, a barrier island community in Pinellas County, boats were grounded in front yards.
The city of Tampa posted on X that emergency personnel had completed 78 water rescues of residents and that many roads were impassable because of flooding. The Pasco County sheriff's office rescued more than 65 people overnight.
Officials had pleaded with residents in Helene's path to heed evacuation orders, describing the storm surge as "unsurvivable," as NHC Director Michael Brennan warned.
Some residents had stubbornly stayed put.
Ken Wood, 58, a state ferry boat operator in Pinellas County, said he should have heeded evacuation orders rather than riding out the storm at home with his 16-year-old cat, Andy.
"I'll never do that again, I swear," Wood said. "It was a harrowing experience. It roared all night like a train. It was unnerving. The house shook."
Down the hill from his house, the storm flooded some homes with chest-deep salt water. One house caught fire and burned down, shooting 30-foot flames in the stormy sky, he said.
"Old Andy seemed like he didn't care," Wood said. "He did fine. But next time we leave."
Pinellas County Sheriff Bob Gualtieri said first responders were unable to answer several emergency calls from residents overnight due to the conditions. On Friday, county authorities found at least five people dead.
Two other people in Florida died, Governor Ron DeSantis confirmed. Georgia Governor Brian Kemp cited 11 storm-related fatalities in his state so far, while North Carolina Governor Roy Cooper said there had been two deaths there.
At least 13 people had died during the storm across South Carolina, the Charleston-based Post and Courier newspaper reported, citing local officials.
Helene was unusually large for a Gulf hurricane, forecasters said, though a storm's size is not the same as its strength, which is based on maximum sustained wind speeds.
A few hours before landfall, Helene's tropical-storm winds extended outward 310 miles (500 km), according to the National Hurricane Center. By comparison, Idalia, another major hurricane that struck Florida's Big Bend region last year, had tropical-storm winds extending 160 miles (260 km) about eight hours before it made landfall.
More than 4.6 million homes and businesses were without power midday on Friday in Florida, Georgia, the Carolinas and other states, according to the tracking website Poweroutage.us.
(Reporting by Rich McKay in Atlanta, Brendan O'Brien in Chicago, Andrew Hay in Taos, New Mexico, Brad Brooks in Longmont, Colorado, Swati Verma and Rahul Paswan in Bangalore; Writing by Joseph Ax, Brad Brooks and Andrew Cawthorne; Editing by Paul Thomasch, Richard Chang and Bill Berkrot)
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