Add a vertical component your structure and you will really have something.
+1 on some vertical structure. Maybe something that sticks up just above the surface.
I also like it to mark your heavy horizontal structure for fishing. I would throw a Texas-rig plastic worm over that stump and hop it through. If full pool puts 5' of water over that structure, then I would only try to get a crankbait down 4' when casting to that spot. It is nice to know exact locations, even if you are just casting a bobber for kids. Pro tip: kids enjoy waiting while you take fish off the hook, they don't enjoy it as much when you have to re-tie fishing gear after getting snagged.
I do NOT know about unwanted birds using the top of structure that is just above water level. If you use something like a vertical trunk from a small tree, perhaps drive a piece of rebar in the top so it is a terrible perch?
