(AP) - State officials are warning that a 99-year-old dam in Northern California is at risk of collapsing this winter if a big rainstorm comes through.
KCRA-TV reports that the concrete damn in Jackson was built in 1916 and holds back large quantities of arsenic-contaminated tailings left over from gold mining.
In June, the U.S. Army Corps of Engineers found that the dam was structurally unsound.
California Department of Toxic Substance Control officials say they recently began a $1 million emergency repair operation that is expected to be completed this month.
The city of Jackson says the National Weather Service will issue a warning if rainfall amounts reach certain levels that could exacerbate the dam's structural problems.
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