Evacuations ordered over concerns at California dam system

CNN: At least 188,000 people have evacuated from several Northern California counties after damage to a spillway at the Oroville Dam.
The dam, which is the nation's tallest, remains intact. But the emergency spillway, which guards against the overflow of the dam when water levels are high, was eroding Sunday.

The damage prompted a mandatory evacuation for cities and counties near Lake Oroville. In the worst case scenario, one official said, an uncontrolled release from the dam could send a 30-foot wall of water downstream.

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