If you know anyone who has one of those expensive side-scan fish finders ($1000-$2500), they can paint the bottom and see protruding structure. It is amazing how much wood survives from old piers. I've seen late 18th to middle 19th century pier stubs at low tide and have seen one 1844 pier that's still above water, although it has been pickled nicely in fresh but polluted water.
Getting the layout of the piers would be a very good thing, although one would expect them to reflect the town layout to some extent and then perhaps joined by cross piers.
Lyle Browning
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