What is the cause and effect of the mississippi river flood in 2011?

The Mississippi River floods in April and May 2011 were among the largest and most damaging recorded along the U.S. waterway in the past century, comparable in extent to the major floods of 1927 and 1993. In April 2011, two major storm systems deposited record levels of rainfall on the Mississippi River watershed. When that additional water combined with the springtime snowmelt, the river and many of its tributaries began to swell to rec

cause : Climate change advanced the storms to time it along with summer snow melt in the Rockies (for Missouri system).
effect : Unprecedented floods that weren't foreseen for which the cities on its bank (mostly Mississippi from St.Louis & downstream) unprepared, causing property loss on a large scale.
It has also restored water flow volume to the pre-Columbus times undoing the ecological harm, mainly by filling up the connected lakes. In normal times the lakes reduce the high water levels by withdrawing water from Mississippi.