If *I* we in charge of selecting targets, I’d go straight to mid America. Memphis, St. Louis, Kansas City, Omaha. softer targets, malls, zoos, cinemas - and instant terror.
If they can strike the mall in Kansas City, or a bridge in Memphis, no one is safe.
Apparently the Old River Control Structure has also slipped through the cracks. Almost failed by flood impact in 1973, and wood have diverted the Mississippi permanently down the Atchafalaya Basin.
http://www.newyorker.com/magazine/1987/02/23/atchafalaya