SAN FRANCISCO (AP) — Federal dam regulators say they are looking hard at how they missed the built-in weaknesses of the nation’s tallest dam.

The Federal Energy Regulatory Commission says in a letter sent late last month it wants owners of the 1,700 hydroelectric dams it regulates to look just as hard at their own dam safety.

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The call for internal organizational reviews at dams nationally comes one year after devastating spillway collapses at California’s 70-story-high Oroville Dam. Dam industry veterans call the crisis the worst failures at a major U.S. dam in decades. Authorities ordered the evacuation of nearly 200,000 people downstream the night of Feb. 12, 2017.

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No one died, but California one year later is facing billions of dollars in repair bills and legal claims.

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