Tennessee Department of Transportation crew worked to close state Highway 88 outside Halls, as water began moving over the road that connects US Highway 51 and the Mississippi River.
Forecasters expect more heavy rains in parts of the flood-ravaged south on Tuesday, prolonging the misery for worried people unable to return to homes surrounded by water.
Some of the hardest-hit areas were under a flash-flood watch, as the National Weather Service said as much as 5 centimetres (2 inches) of rain, and even more in some spots, was expected to fall in a short amount of time in central Mississippi.