I believe they are under the docks but usually down so far... docks and the crappie beds dock owners place are pretty much the only structure on LOZ(with exceptions).
Lots of fisherman get a dock or a slip at a marina then pretty much only fish the dock there after... personally I prefer to be in the boat burning gas, getting sun burned, and not catching, over sitting on a dock all day.
We always gathered all the Christmas trees we could find and sunk them to one side of our dock, away from the swimming ladder/part of the dock.
Look for docks with fishing boats.
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