Crikeys!! It appears that we haven't learned a whole heck of a lot about monkeying with Nature. In FloriDUH, they re-directed a river (don't recall which one) and it caused them no end of trouble. Eventually, they just let it return to its natural bed and the problems went away.
The Mississloppi River has been no end of problems since it was re-directed. The levee system has been expensive to maintain and, after a hard rain, Nawlins pumping stations work overtime draining flooded streets. In the words of Susan Powter, "End the madness!" Let the Mississloppi return to its natural bed and just deal with it! It's what nature intended.
It's in 1 of it's natural beds, the problem is they've been trying to keep it there while it wants to go spend a weekend (or a millennium) at one of its other places.