I built mine using concrete pads (about 50lbs each) with 4x4 preformed concrete holders like used for decks with 4x4 treated posts attached. It has been in-place for 5 years now, and the pond regularly freezes deeper than 6" in winter. Absolutely no problems, and it does not lift. I believe the weight is enough that it stays pinned down. No chew marks on the posts from ice, just skate marks on the top of the dock!

Since pond ice < 4 acres is not subjected to too much of a wind load like a lake or river, ice pressure is minimal. You will be fine with 4x4s and up. Just make sure to purchase lumber treated for 100% soil contact and complete water immersion. The Home Depot variety is not suitable.

Dock In Winter

Last edited by liquidsquid; 05/30/17 01:28 PM.