Red River and Mississippi River were parallel rivers each flowing south to the Gulf of Mexico.
Westwardly meander belt of the Mississippi intercepts the Red. The upper Red becomes a tributary, the lower Red becomes a distributary, named the Atchafalaya.
Shreve cuts off Turnbull's Bend.
Upper Old River channel abandoned, Lower Old River links the three rivers, log jam in Atchafalaya is removed. Atchafalaya becomes deeper and wider carrying more and more Mississippi flow.
New Orleans District completes construction of Overbank Structure and Low Sill Structure in 1964 Completes Navigation Lock and Old River Closure in 1963.
Auxiliary structure completed in 1986. Hydropower plant completed in 1990.