Old River Control Structure be opened in an emergency to relieve water levels and water-pressure stress on various levees and other flood-control structures, including the Old River Control Structure. The floodway can reduce stress by diverting additional water from the Mississippi into the Atchafalaya. The Morganza Floodway was never used before the construction of Old River Control Structure, and as of 2016 has been opened only twice for flood control since completion of the Old River Control Structure. Old River Control Structure The Old River Control Structure is a floodgate system in a branch of the Mississippi River in central Louisiana. It regulates the
175th New York Volunteer Infantry 26-30. Siege of Port Hudson May 30-July 9. Assault on Port Hudson June 14. Surrender of Port Hudson July 9. Moved to Baton Rouge July 22, and duty there until March 1864. Operations about St. Martinsville November 12, 1863. Red River Campaign March 23-May 22. At Alexandria March 25-April 12. Cane River April 23-24. At Alexandria April 26-May 13. Retreat to Morganza May 13-20. Mansura May 16. At Morganza until July. Expedition from Morganza to the Atchafalaya May 30-June 5. Atchafalaya River June 1. Moved to Fort Monroe, Va., then to Washington, D.C., July 5-29. Sheridan's Shenandoah Valley Campaign August