Authorities ignored California dam warning for 12 years, say environmentalists

A warning issued 12 years ago that California’s Oroville Dam could be at risk of eroding was apparently ignored by the authorities. America’s tallest dam was reported to be at risk of collapsing Sunday night, forcing mass evacuations.

A document released by three environmental groups more than a decade ago said that the dam’s “ungated spillway” design could result in the “loss of crest control” and threaten people’s lives.

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