NASHVILLE, Ill. — Emergency officials said residents in some neighborhoods of Nashville, Illinois, are being urged to evacuate after a nearby dam is imminently failing. Recent heavy rains triggered Flash Flood Warnings in the region Tuesday morning, and flood waters overtopped the dam behind the Nashville City Reservoir. "Attention the failure of the Nashville dam is imminent," Washington County (Illinois) emergency managers wrote, adding a map shading an area at risk of flooding downstream. "If you are in the grey box, you need to evacuate now!" Two shelters have been opened in the area.