SANTA FE, N.M. —

Across the United States, more than 121,000 dams quietly shape daily life by supplying water, generating hydropower and providing flood control. But according to the National Performance of Dams Program, on average about 10 dams fail each year.

Sometimes these failures have devastating, even deadly consequences. Many are aging, high-hazard structures in need of costly repairs, and the Hearst Television National Investigative Unit found money is scarce and owners are often left footing the bill. Latest Forecast

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Behind a locked gate and up a winding road in Santa Fe, New Mexico, is the nearly 100-year-old McClure Dam. It supplies up to half of Santa Fe’s drinking water and is owned by the

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