Opening with an explanation of the national importance of the Mississippi River as a major trade waterway, the film explores the Army Corps of Engineers’ methods of maintaining it as a safe navigational channel. It also chronicles how the Corps has built countless levees, dams, floodways, etc., in order to prevent a recurrence of the massive destruction of the delta that resulted from the 1927 flood. Department of Defense. Department of the Army. U.S. Army Corps of Engineers.