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The Morganza Spillway, between the Mississippi River and the Atchafalaya Basin, shown while open in 1973. Water flows from the Mississippi (upper right) into the Morganza Floodway (lower left). The Morganza Spillway or Morganza Control Structure is a flood-control structure in the U.S. state of Louisiana.
The Old River Control Structure is a complex containing the original low-sill [6] and overbank [7] structures, as well as the auxiliary structure that was constructed after the low-sill structure was damaged during the Mississippi River Flood of 1973. The complex also contains a navigation lock and the Sidney A. Murray Jr. Hydroelectric Station.
In late May 2019, the U.S. Army Corps of Engineers announced plans to operate the Morganza Control Structure in early June to prevent overtopping of the structure and reduce river stages along Mississippi River levees. The proposed operation would have diverted 150,000 cfs from the Mississippi River into the Morganza Floodway.
The Morganza Spillway, a flood control structure between the Mississippi River and the Atchafalaya Basin, is located nearby. History. Old Morganza High School.
Elliot City was abandoned in 1939 when its residents were forced to leave due to the construction of the Morganza Spillway. This area is inside the floodway levee system and was entirely underwater when the floodway gates at the Morganza control structure were opened in 1973 and 2011 to relieve the high water level of the Mississippi River.
The 1973 flood was the first time the Morganza Spillway was opened: from April 19 through June 13. At Memphis, Tennessee , the Mississippi was over flood stage for 63 days, more than that of the historic 1927 flood , and the river was above flood stage for an even longer 107 days at upstream Cairo, Illinois . [ 3 ]
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The last use was in 1973, when a potentially catastrophic failure arose at the Old River Control Structure. The model was used to show that the untested Morganza Spillway could be opened effectively, without diverting polluted water through New Orleans and Baton Rouge, as well as identifying levees that required topping up. [4]