Lots of good wood in Truman! If you have a boat, you can get some really prize stuff from the still standing stuff. The Clinton/ Deepwater end comes to mind when I think of wood but I'm sure lots of that winds up on the banks. If no boat, look over the shore and I'm sure there's good stuff. For a tall tank, I like the idea of hollow with plants sticking out of the holes up and down the wood. Look for the totally dry all the way through stuff and then do an overnight bleach water soak in a plastic trash can . Next day take it out, rinse it and when it dries, the chlorine will be gone.
Cheap and easy.