Low Sill Structure


One of the dams  used to control the Mississippi River and prevent it from changing its course  to the Atchafalaya distributary. The dam was finished in 1963, and sits on a manmade outflow channel that runs between the Mississippi and the Atchafalaya. It is 170m wide with 11 gates so that flow rate may be controlled. Ideally, 70% of the flow is directed to the Mississippi, and 30% is allowed down the Atchafalaya. In 1973, the river was very high and caused part of the Low Sill Structure to collapse. It was rebuilt, although with some modifications. At the present time, it is still controlling the flow with the help of the Auxiliary structure further south.


http://users.stlcc.edu/jangert/oldriver/oldriver.html