AP investigation: Aging US dams pose risk to thousands

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An investigation by The Associated Press shows that scores of dams across the U.S. are in a state of decay and are endangering thousands of people who live downstream.

The more than two-year investigation relied on federal data and records obtained separately from nearly every state to identify at least 1,680 high-hazard dams that are rated in poor or unsatisfactory condition. A high-hazard dam is one that would endanger human life if it failed.

The actual number is almost certainly greater: Some states declined to provide condition ratings for their dams, claiming exemptions to public record laws. Others simply haven’t rated all their dams due to lack of funding or staffing.

WATCH: AP’s investigation into aging dams in the US and the risks they pose

The potential danger is compounded by climate change, which is expected to cause more frequent and severe storms.

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