Authorities in Portage, Wisconsin, worked Sunday to evacuate residents as a levee along the Wisconsin River approached imminent failure after heavy rainfall soaked the Midwest last week.

"It could collapse at any time," said Greg Matthews, a spokesman for Wisconsin's Department of Natural Resources.

An alert sent out by Columbia County Emergency Management on Sunday urged residents near Blackhawk Park to evacuate immediately ahead of the flooding, which is expected to wash out a main road leading to about 150 residences.

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