Water flows over the emergency spillway at Lake Oroville for the first time in the nearly 50-year history of the Oroville Dam, 11 February 2017

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AP

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Water flows over the emergency spillway at Lake Oroville for the primary time in its close to 50-year historical past

Hundreds of individuals in northern California have been advised to evacuate their properties after the tallest dam within the US was weakened by heavy rainfall.

The emergency spillway of the Oroville Dam may collapse at any second, officers mentioned.

Folks residing in flood threat areas have been ordered to depart instantly.

Water ranges within the reservoir have been rising due to heavy rain and snow in California following years of extreme drought.

It’s the first time that Lake Oroville has skilled such an emergency within the dam’s close to 50-year historical past.

The California Division of Water Assets mentioned on Sunday that it was releasing as a lot as 100,000 cubic ft (2,830 cubic metres) of water per second from the primary spillway to attempt to drain the lake.

In an announcement posted on social media, the sheriff for the realm across the Lake Oroville Dam in California ordered residents to evacuate, warning them it was not a drill.

On Thursday engineers started releasing water from the dam after noticing giant chunks of concrete have been lacking from a spillway.

Residents of Oroville, a city of 16,000 folks 65 miles (105km) north of Sacramento, have been advised to move north.

Different cities affected ought to comply with orders from their native legislation enforcement businesses, officers mentioned.