Watch: Drone footage of flooding in Nashville, Illinois, after a dam failed.

The dam at the Nashville City Reservoir has failed and the Washington County Emergency Management Agency has asked residents in portions of the town to evacuate Tuesday morning.

According to an alert on its social media, the emergency management agency said the dam has been overtopped with floodwater, leaving about 200 residents endangered.

“Washington County is experiencing an emergency flood situation,” the agency said on Facebook as storms raked the metro-east. “Stay at home unless evacuations are needed. Do NOT attempt travel. Many roads are underwater with another 2-4 inches of rain possible. Crossing flooded areas may result in permanent injury or death.”

A shelter has been established at 680 W. Walnut St. in Nashville. The American Red Cross has been called in to assist, according to the emergency management agency.

As of 11 a.m., there were no reported injuries, according to Alex Haglund, a spokesman for the Washington County Emergency Management Agency. He said emergency workers assisted at least one person who was up to their waist in water in their home.

“It’s not an enormous area, but it’s an enormous effect for the people in that area,” Haglund said.

Nashville Fire Chief Allen Hohlt said a woman was rescued from her camper by boat. She didn’t realize it was flooding, he said.

A map detailing the areas under threat includes both Nashville High School and Elementary School. The emergency management agency is asking anyone who does not live in the threatened area to remain at home.

A dispatcher at the Washington County Sheriff’ told a reporter the department “is getting slammed with 911 calls” and that it has dispatched “numerous search and rescues.”

St. Clair County Special Emergency Services have been deployed to Nashville to assist in water rescues and evacuation.

Steve Luker of the Jefferson County Emergency Management Agency also was at the Walnut Street shelter to assist. He said the continued downpours have made access difficult.

“It took over an hour and a half to get here from Mount Vernon,” he said. “It usually only takes 30 minutes. All northern routes are closed.”

According to a meteorologist with the National Weather Service office in St. Louis , radar shows up to 5 inches of rain may have fallen in Washington County. The Washington County Sheriff’s Department reported at 1 p.m. Tuesday that 6 inches had fallen.

Continued rain is expected into the evening, he said, though he had no immediate prediction as to how much was possible.

Three families were making use of the shelter as of 11:30 a.m.

“We’ll stay open as long as it takes and we’ll hold as many people as the Red Cross will let us,” said David Benning, pastor of Trinity Lutheran Church, where the shelter has been established.

Washington County Sheriff Ross Schultze said in a release that the immediate threat is under control, but road closures and additional rain are still being monitored closely.

“While the immediate danger to those downstream from the dam has been managed, there are still multiple road closures in the area, including Interstate 64 between the Nashville and Ashley exits, and multiple closures on State Routes 15 and 127,” he said in a statement.