Heavy rains hit southwestern Connecticut on Sunday afternoon, leading to flooded roads, rescue operations and even mudslides.

Dozens of campers were stranded in a state park after a bridge was washed away, but authorities said they were safe.

In the town of Oxford in New Haven County, two people were missing after being swept into the Little River, WFSB-TV reported.

Fairfield and New Haven counties were hardest hit, with some areas receiving between 6 and 10 inches of rain, with 1 to 2 inches of rainfall falling every hour, weather officials said. More rain is expected across Connecticut on Monday.

Authorities warned the population to stay at home during the storm. Drivers should not drive through flooded streets or intersections under any circumstances, but always turn around.

Gov. Ned Lamont called the storm “historic” for some areas of the state. He said he and the state’s emergency management agencies were working with local authorities to sort out the storm’s aftermath. Municipal search and rescue teams had evacuated at least 100 people from unsafe conditions by Sunday evening, he said.

“As soon as it gets light, crews will be out to assess the damage and begin cleanup,” Lamont said. “If you live in western Connecticut, we urge you to stay home if possible until the flooding recedes and definitely not attempt to drive on flooded roads.”

The rain was so heavy that the National Weather Service declared a flash flood emergency for central Fairfield County and northwestern New Haven County on Sunday evening.

Flash flood warnings were also in effect Sunday evening for southwest Hartford County, southeast Litchfield County, central Fairfield County and New Haven County.

In Fairfield County, Danbury rescue crews responded to more than a dozen water rescue calls, said Bernie Meehan, deputy chief of the Danbury Fire Department.

“People insist on driving into deep water, putting themselves in danger and the fire department has to rescue them,” Meehan said.

At least one landslide occurred in Danbury, but it is under control, officials said.

A 110-unit senior housing complex was quickly flooded and emergency workers helped residents escape, including carrying a woman who was “basically on life support” through the water to an ambulance that took her to a hospital, Meehan said.

Emergency services also evacuated pets.

“They wouldn’t leave without their pets,” he said.

About 50 campers stranded in Southbury

In New Haven County, about 50 campers were stranded at Kettletown State Park in Southbury because a bridge was washed away.

The Connecticut Department of Energy and Environmental Protection informed the public on Sunday evening that there was no danger to the campers.

Officials worked in coordination with other agencies on a plan to evacuate the campers.

Emergency crews were responding to emergencies and road closures throughout Southbury.

Southbury police advised residents to stay home. The department said on social media that emergency responders “will only be deployed to residential flooding that poses an immediate threat to safety.”

Elsewhere in New Haven County, in the town of Oxford, First Selectman George Temple posted a similar appeal on Facebook around 6:15 p.m. on Sunday.

“This is not the time to go out for any reason,” Temple said, adding that the city is experiencing “significant flooding, landslides and other dangerous conditions.”

He noted that the fire department and police were overwhelmed with dealing with various emergency calls.

In Fairfield County, in the city of Redding, officials said creeks and rivers overflowed onto roads and bridges, and rescue crews were on duty to help motorists stuck in the water.

The weather on Sunday was a “double blow”

In Stamford, several buildings were flooded. At Pilgrim Towers, a senior living complex, the garage flooded, submerging some vehicles. No one was injured, said Stamford Fire Department Assistant Chief Philip Hayes.

“We went door to door to make sure everyone was okay and that they didn’t need anything, no medicine,” he said.

Hayes described Sunday’s events as a “double whammy.”

First, the heavy rains coincided with a high tide, causing flooding in some areas. The second blow was river flooding, he said.

On Sunday morning, Stamford emergency crews responded to 10 vehicles whose drivers needed assistance in the flood. No one was seriously injured, Hayes said.

“Unfortunately, some people try to get past it with their vehicles that are just too low to the ground and they get stuck in the water. We send our fire engines there,” he said. “People in special suits go out and we get people out of the danger zone and to safety.”

Forecast for Monday

Rain and isolated thunderstorms are possible in parts of Connecticut on Monday, with highs around 80 degrees. Even small amounts of rain could cause problems with soils already soaked by Sunday’s storms.

Tuesday will be cloudy, with some possible showers in the morning, otherwise it will remain dry and cooler, with highs around 21 degrees.

Lori Mack, Garett Argianas and Eric Aasen of Connecticut Public contributed to this report.