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The Oroville Dam main spillway on August 5, 2018, during phase 2 repairs. The main spillway was successfully reconstructed by November 1, 2018. [46] According to its 2017–18 operations plan, the DWR maintained Lake Oroville at a lower than normal level to reduce the possibility that the spillway would have to be used the following winter. [44]
The California Department of Water Resources on Wednesday began releasing water from Oroville Dam’s main spillway. ... The main spillway continues to perform well and operate as designed, DWR ...
On February 12, 2017, evacuation was ordered for those in low-lying levels of Oroville, due to an anticipated failure of the auxiliary spillway. [1] A failure of the concrete top of the spillway would allow up to 30 vertical feet of Lake Oroville through the gap in an uncontrolled deluge.
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After deterioration of the main spillway largely stabilized [12] and the water level of the dam's reservoir dropped below the top of the emergency spillway, the evacuation order was lifted. [13] The main spillway was reconstructed by November 1, 2018, and water releases were successfully tested, up to 25,000 cu ft/s (710 m 3 /s), during April 2019.
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Aerial photo of Lake Oroville, Oroville Dam, the spillway, and the Feather River. The Oroville Dam is the tallest and largest dam in the United States. Completed in 1968, it stands 770 feet (230 m) high with a crest length (top of the dam) 6,920 feet (2,110 m) long. Over 80 million cubic yards of material were needed to build the Oroville Dam.
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