Mandatory evacuations remained in effect Monday afternoon for nearly 190,000 people in Northern California after a spillway serving the country’s tallest dam developed a hole that threatened to release uncontrolled floodwaters, officials said.

The emergency spillway off the Oroville Dam was the second to fail in a matter of days, after the dam’s primary spillway developed a 200-foot-long, 30-foot-deep hole last week.

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