Is there a way to know if the pond had a clay liner or not without tracking down the original builder? Would a pier post go deep enough to crack it? I can’t imagine having to drill it(for lack of better word) more than 12 inches into bottom. My issue with floating docks is stability. I like being anchored when on a dock without movement. Obviously I’d rather have a dock that moves around a little vs messing up my pond.

While I’m typing this. There are several old standing timber in the pond. Would that mean no clay liner and they just flooded bottom land with a levee?