All about the flow of the river. Boaters chop it up with their props or the TVA mulchers. When water is being released through the dam, the fragments are pulled to the channel from the coves and pockets. Then when the dam stops releasing, all of the fragments remain near the channel. I have found several crankbaits in the trash mats this year.

You have brains in your head.
You have feet in your shoes.
You can steer yourself
any direction you choose. You're on your own. And you know what you know. And YOU are the one who'll decide where to go.... (Seuss)