Extreme rain on snow is testing aging dams across Michigan and Wisconsin – this is the future in a warming world

Michigan and parts of Wisconsin are in the midst of a historic flooding event in spring 2026. Days of heavy rainfall on top of snow have sent lakes and rivers over their banks and threatened several dams in both states, forcing people to evacuate homes downstream. By April 20, 2026, nearly half of Michigan’s counties were under a state of emergency. In Cheboygan, Michigan, large pumps were brought in to lower pressure on a century-old dam in the city. The region’s aging water infrastructure was never designed for the volume of water it is facing. That’s a troubling sign for the future, with flooding becoming more common as global temperatures rise. In many areas, the damage has been exacerbated by a culture of building homes and cabins on the shores of inland lakes and along riverine lakes behind small, often privately owned dams. Many of these dams were built over 100 years ago, with some long forgotten. I am a professor emeritus of meteorology at the University of Michigan whose work focuses on helping communities adapt to climate change. The warming climate is worsening the flood risk, and disasters like the one Michigan is experiencing are setting higher benchmarks for…

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