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The Old River Control Structure is a floodgate system in a branch of the Mississippi River in central Louisiana. It regulates the flow of water from the Mississippi into the Atchafalaya River, thereby preventing the Mississippi River from changing course.
Another possible course change for the Mississippi River is a diversion into Lake Pontchartrain near New Orleans. This route is controlled by the Bonnet Carré Spillway, built to reduce flooding in New Orleans.
During the Civil War, the Mississippi River began to change course. [53] A sand bar developed upstream and pushed the river west, [2] and Rodney's former shipping channel became a swamp. [53] After the river changed course, Rodney gradually went from a major port to a ghost town. [7]
The spillway and adjacent levees also help prevent the Mississippi from changing its present course through the major port cities of Baton Rouge and New Orleans to a new course down the Atchafalaya River to the Gulf of Mexico. The Morganza Spillway, operated by the U.S. Army Corps of Engineers, was opened during the 1973 and 2011 Mississippi ...
In April 1876, the Mississippi River changed course, cutting through De Soto Point and eventually isolating Vicksburg from the riverfront after the oxbow lake formed by the course change became cut off from the river. Vicksburg would not be a river town again until the completion of the Yazoo Diversion Canal in 1903. [73]
From 1989 to 2009, there were 128 locations where the river changed course, causing land that had been on one side of the river to then occupy the opposite bank. Until the boundary is officially changed, there are 60 small exclaves of the state of Texas now lying on the southern side of the river, as well as 68 such exclaves of Mexico on the ...
River Outlet Continent Date of reversal Cause of reversal References Chicago River [a] Mississippi River: North America: 2017 and others [b] Storm surge [11] Mississippi River: Gulf of Mexico: North America 1812: Tectonic uplift caused by New Madrid earthquakes [12] 2005: Storm surge from Hurricane Katrina [1] 2012: Storm surge from Hurricane ...
Bayou Teche was the Mississippi River's main course when it developed a delta about 2,800 to 4,500 years ago. Through a natural process known as deltaic switching, the river's deposits of silt and sediment cause the Mississippi to change its course every thousand years or so.