Missouri has several large man made lakes and when they were built much of the timber was left standing in the water. These dead trees have been in the water for 30 plus years. I am amazed that most of these trees and branches are still solid and strong. My best guess is these are Oaks and Cedars and they are do not rot when kept underwater.
This is why I chose untreated cedar for my piers.
I really have no idea how long my untreated 6x6 cedar posts will last. I imagine they will first begin to decay at the water surface.
Does anyone know of any old wood pier docks? How long do certain types of wood piers last?

Jeff Gaines