“If it keeps on rainin’, levee’s goin’ to break.” These lyrics, written in 1929 by Kansas Joe McCoy and Memphis Minnie (and later a Led Zeppelin hit), were a direct reference to the Great Mississippi Flood of 1927, and the necessity of civil engineering. At the Jesse Brent Lower Mississippi River Museum in Vicksburg, Mississippi, the U.S. Army Corps of Engineers (USACE) tells its side of the story: both about the Great Flood itself, and how the USACE was then charged with taming the mighty Mississippi River. The Great Flood…