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Manawa Police Chief Jason Severson estimated that a 50-foot-wide (15.2-meter-wide) area around the dam had eroded.

Gates on the dam eventually were opened to release water and relieve pressure on the structure, officials said.

“It looks like the dam is intact, but there is quite a bit of erosion on the north side," Severson told reporters Friday afternoon. ”We think the worst of it is over, so now we’re going to start assessing things and see where we go from here.”

As the erosion worsened, authorities began evacuating some homes, he said.

The rains started about 8:30 a.m. Friday and about 5 inches (12.7 centimeters) fell in a few hours. A flash flood warning was issued for Manawa and other parts of Waupaca County

“It just wouldn't stop raining in and around the Manawa area,” Cultice said. “They had water rescues. Most of the downtown roads were flooded.”

“We just can't get rid of the rain,” he added. “It's just not moving, just stalling.”

Emergency shelters have been set up in a high school and a masonic center.

“Due to the amount of water the dam isn’t safe,” the said on its Facebook page.

All entrances to the city of Manawa, about 55 miles (88 kilometers) west of Green Bay, also have been blocked, the city said in .

"Please do not try to drive into the city or around the city,” the post read. “Vehicles are being flooded on the roads around the city. Union Street is flooded. N. Bridge Street is flooded. Beech Street is washed away. Howard Street is flooded. Industrial Drive is flooded.”

“Because of the amount of rain we are receiving ... there will be flooding in the streets and yards,” the post continued. “It is everywhere in the city.”

that the rain, and possibly thunderstorms, could occur through the weekend and into early next week.

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This story has been corrected to show that Manawa is in eastern Wisconsin, not southeastern Wisconsin.