Since my pond is drained right now the 6x6's will be set 3 feet deep and secured with some concrete and cross braces. I'm just building a plain dock with an 4'x10' approach ramp leading out to a 12'x16' dock. No railings. Pressure treated supports, beams and joists. I'll be using ProCell composite decking for the surface. There are some real nice decks posted on this site. Brettski has one. Ahvatsa too.