Location of River: USA starting in Minnesota and along the borders of states Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana.
Frequency of Flooding: severe floods occur every 10-25 years, however flooding is getting more frequent and more severe. Yearly flooding.
Meteorological Conditions: Some believe worsening of Mississippi River floods are due to a combination of changing climate and federal water projects over a century that have turned the river into a superhighway for shipping. Construction of locks, levees and weirs, critics say, has created a deep passageway for shipping that has unnaturally constrained the river, forcing floodwaters higher in times of heavy rain. Meanwhile, they say, warming temperatures are forcing more water into the atmosphere, leading to heavier rainfall.
1.) The Great Flood of 1844 is the biggest flood ever recorded on the Missouri River and Upper Mississippi River, in North America, in terms of discharge. The adjusted economic impact was not as great as subsequent floods because of the small population in the region at the time. The flood devastation was particularly widespread since the region had few or no levees at the time, so the waters were able to spread far from the normal banks. Congress in 1849 passed the Swamp Act providing land grants to build stronger levees.