and I'm sure you found this link.
http://www.nh.gov/safety/divisions/n...rings/faq.html
How does a property owner get approval for a mooring?
The individual or group needs to show there is a demonstrated need, such as no other docking facilities for their boat(s).
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ATTENTION ALL LOT OWNERS WITH LESS THAN FIFTY (50) FEET OF FRONTAGE:
RSA 270:59 VIII(b) requires that lot owners with less than 50 feet of frontage must obtain written consent of the abutting property owners stating that the abutting property may be included in the frontage calculation.
Such consent shall be signed by both parties, notarized and filed with the mooring application.