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1955 Yuba–Sutter floods

1955 flood in California, U.S.

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Through Christmas

The floods were described as "the worst in the history of northern California"; thousands of people were forced to evacuate. They have been compared to those of 1986 and 1997. Recovery and rescue efforts were widespread with over 2,000 volunteers working to help repair leaking levees and helicopters transporting residents away from flooded areas, notably Yuba City.

Cause

In the first two weeks of December, a flow pattern over portions of north California was in a west to northwest direction, which let multiple storm systems move through coastal areas. These storms, while relatively weak, helped soak soil and fill streams, which directly contributed to flooding at the end of the month. Hydraulic mining was also noted as a potential cause for the eventual flood; mining eroded hillsides and shifted normal waterways. Additionally, an ineffective system of levees located in the Shanghai Bend area directly contributed to the floods. Due to geography of the area, several large floods have impacted the region in the 50 years before and after the 1955 floods.

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