Not sure if standard auger pipes would work for you but they are designed for a full pond (search on "pole auger" and "dock post" at Menards website for examples). Even if nothing breaks, I expect the cables or chains will allow quite a bit of sway to the dock when folks are moving about near the end (based on my dock. I tend to try things my way first and gloat when it works or hang my head and fess up when it does not. My foray with a small blue catfish pond may end up the latter:) Good luck!