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Climate Change Is Increasing Stress On Thousands Of Aging Dams Across The U.S.

A dam’s design can affect its ability to withstand overtopping and resist failure.

Water flows around the Rapidan Dam near Mankato, Minn., on June 24, 2024, after heavy rains in the Upper Midwest.Credit:AP Photo/Mark Vancleave

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Every four years, the American Society of Civil Engineers produces a report card for the nation’s infrastructure that assigns grades based on the condition of structures like roads, bridges, and dams, and the investments that they need. Heavy rainfall generated widespread flooding. in the Upper Midwest in late June 2024, putting at least one aging dam at risk. In southern Minnesota, the Blue Earth River cut a path around the Rapidan Damin Rapidan Township, about 15 miles south of Mankato, on June 24, putting the structure at imminent risk of failing. Officials warned local residents that if the dam burst, the river could rise by 2 feet, but said that evacuations were not needed.

This event comes a year after flooding in Vermont collapsed at least one dam and threatened others. Hiba Baroud, associate professor and associate chair in the department of civil and environmental engineering at Vanderbilt University, explains ...

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