As someone who has a severely handicapped relative (confined to a wheelchair and unable to walk at all) I think the only realistic way to make a dock, public or otherwise, truely handicapped accessable is with a piece of equipment like
THIS built into the dock designated as handicapped. Constructing more docks won't really help anyone confined to a wheelchair.
Do I think Wolfboro or any other community will do this? Nope, so putting a handicapped sign on a dock or two is only an attempt to try to show compliance to the ADA and avoid future lawsuits or federal compliance orders. IMHO