The Great Floods of 1927 and 2011

http://www.weatherbell.com/jd/?p=1439

The Great Flood of 1927 did the equivalent of over 5 billion dollars (at current value).  It was one of the most powerful natural disasters of the 1900s. Following several months of unusually heavy rain during late 1926 and early 1927, the Mississippi River flooded. During the height of the flood, the river was over 80 miles wide at some locations.