I bought a house last year with 200 ft of bog to get to the lake. After talking with the neighbors they said stay away from pier type docks. Everyone of them that build a permanent pier type dock was constantly dealing with heaving and having to redo the dock every year. Further, on years when the water got really high it pulled the dock up causing a bigger mess. Plus, if the ice comes in on a pier type dock you will watch the thing buckle and snap like twigs. I built my dock on top of plastic barrels. The first 200+ feet I set right on top of the bog and the last 35 ft is actually floating. Setting it on top of the bog eliminated the need for mobile connections between dock sections which saved big money as they are about $50/80 a pair. The dock on the bog is just screwed together from one section to the next as the bog does not move enough to matter. The remaining three sections are tied together with joints to allow the dock to move with waves. In the winter some neighbors leave everything in place, others just disconnect the floating sections and tie a rope to it so if the ice does come in the dock will move with the ice and they can just pull it back.
The other thing I did since it was going to be permanent is made the dock 6ft wide which allows me to drive the 4 wheeler right out to the boats!!
good luck
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