My Grandfather worked for the Corps for years...was based at Green, but worked Barren, Rough, and others too. They find all kinds of cool stuff in the splash box. He told me about having to go up in the tube quite a ways to work on stuff when the gates were closed, and being in the bottom of the observation tower too....always loved his stories.
Let's hope the Asian Carp they found was a lone ranger...that's scary.