Where is the Oroville Dam, where a damaged spillway and massive amounts of rainfall have led to the evacuation of 200,000 people and a dramatic rock-carrying helicopter plan to plug the giant hole?

The dam — the largest in the U.S. at 770 feet — is east of the city of Oroville, Calif., in the Sierra Nevada foothills east of the Sacramento Valley.

Construction on the dam began in 1961, according to Wikipedia, and the dam was completed in 1968.

It captures water from the Feather River and allows it to be transferred to the California Aqueduct, which supplies water to farms in the San Joaquin Valley and homes and businesses in Southern California.

• See an interactive map of the Oroville Dam on your mobile device

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