Aluminum docks
You should be able to get a 40 X 4 aluminum frame built for about $7,000. There are at least two aluminum fabricators in the Gilford area who will custom build the frame to meet your needs. They will look at your situation and how your dock will attach and pivot for raising and build just what you need.
I am on open water with considerable wave action so I opted for a heavy frame and 4 X 6 posts. I prefer them to the pipe docks. I have put in two aluminum docks over the last 10 years so my pricing is not real recent.
If you are handy at all you can build the decking yourself.
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