Morganza Spillway emergency use to divert additional water from the Mississippi River into the Morganza floodway, which merges downstream with the Atchafalaya floodway before entering the Gulf. Diversion of water from the Mississippi's main channel has the effect of lowering water level in the Mississippi downstream of the spillway, helping to relieve stress on levees and other flood control structures both upstream and down. Besides controlling flooding in a given event, the system is also designed to prevent the Mississippi River from permanently altering course down the Atchafalaya River, bypassing Baton Rouge and New Orleans. Water that passes the Morganza Spillway first
Morganza, Louisiana on December 10, 2008: Morganza was the site of a Union Army encampment during the American Civil War. The largest battle in Pointe Coupee Parish was fought at nearby Stirling Plantation, on September 29, 1863. Sixteen Federal troops were killed, 45 were wounded, and 462 were taken prisoner. The Confederate losses included 26 dead, 85 wounded, and 10 missing. Although the Battle of Sterling Plantation was a Confederate victory, the Union troops burned the town of Morganza to the ground on October 1, 1863. Historian John D. Winters in "The Civil War in Louisiana" (1963) documents the arrival in May