I built my dock with telephone poles,and 5/4x6" lumber for the flooring and added a roof to shade it over twenty-five yrs ago.It's U shaped so I can pull in my 15 ft. flat bottom boat in. I need to replace some of the 5/4 but other than that,no problem with the integrity of the dock. These were the old creosote treated poles and I've never had a problem with leaching,etc. Go fot it.
