The 2011 flooding event on the Missouri River in the United States was triggered by record snowfall in Rocky Mountains of Montana and Wyoming along with near-record spring rainfall in central and eastern Montana. Significantly lower than normal rain in eastern Arizona led to the Wallow Fire. Above normal precipitation along the Ohio River led to the 2011 Mississippi River flood earlier in the year. The map shows that year to date precipitation in the Missouri headwaters basin of Montana had precipitation of 20 inches or more above normal while the rest of the basin precipitation was near normal. Weather Service map showing number of precipitation inches above/below year to date at June 18, 2011. Purple reflects heavy flooding and orange moderate flooding.
The Missouri River is reflected by gages in the middle and top. ( December 2011)Ĭorps of Engineers photo of June 16, 2011, showing the Fort Calhoun nuclear power plant surrounded by flood water NOAA map of flooding areas on June 18, 2011. Please help update this article to reflect recent events or newly available information.
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