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Tallest US dam suffers damage, large population, mostly Sikhs, asked to evacuate

Residents below the tallest dam in the United States near Oroville in Northern California, mainly Indian origin Americans, including 13 per cent of Punjabis/Sikhs, were asked to evacuate immediately on Sunday after authorities said an auxiliary spillway was in danger of imminent collapse.

“Immediate evacuation from the low levels of Oroville and areas downstream is ordered,” the Butte County sheriff said in a statement posted on social media. “This is NOT A Drill. This is NOT A Drill. This is NOT A Drill.”

The California Department of Water Resources said on Twitter at about 4:30 pm PST (0030 GMT Monday) that the spillway was “predicted to fail within the next hour.”

The Yuba County Office of Emergency Services urged evacuees to travel only to the east, south or west.

State authorities and engineers on Thursday began carefully releasing water from the Lake Oroville Dam some 65 miles (105 km) north of Sacramento after noticing that large chunks of concrete were missing from a spillway.

Water levels were less than 7 feet (2 metres) from the top of the dam on Friday as levels in the reservoir rose because of a California winter of heavy rain and snow that followed several years of severe drought in the state.

California Governor Jerry Brown asked the Federal Emergency Management Agency on Friday to declare a major disaster due to flooding and mudslides brought on by the storms.

The earthfill dam is just upstream and east of Oroville, a city of more than 16,260 people.

At 770 feet (230 metres) high, the structure, built between 1962 and 1968, is the tallest dam in the United States, besting the famed Hoover Dam by more than 40 feet (12 metres).

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