Most of my crappie fishing has been in smaller lakes that do not have bridges. Recently I fished a larger lake that had numerous bridges. The locals had ropes hanging down from underneath the bridge and would use it to hold their boat steady. The rope didn't hang down very far so they had some kind of hook on a pole they would reach up with and then secure the other end to the boat. Anybody else do this and maybe have a diagram of your hook set up? These guys I saw had what looked like a rebar hook attached to a length of pvc pipe and somehow a rope was incorporated.