N.H. Rev. Stat. § 12-G:50-a

I. No person shall abandon any vessel at any time on or in state tidal waters. Any vessel found unattended in a sunken, beached, or drifting condition, or otherwise anchored and unattended in such a manner as to pose a threat to navigation or the safety of the public or other vessels shall be deemed abandoned by the owner. II. No person shall place any mooring in state tidal waters without a permit issued by the division pursuant to this chapter and any rules adopted pursuant to this chapter. III. No person shall moor, make fast, or otherwise secure a vessel to a mooring located in state tidal waters unless: (a) The owner of the vessel has secured a mooring permit from the division authorizing such vessel to be secured to such mooring; (b) The owner of the vessel has been directed by, or otherwise has secured the permission of, the chief harbor master, the deputy chief harbor master, a harbor master, or an assistant harbor master to secure such vessel to such mooring; or (c) Failure to secure such vessel to such mooring would otherwise present an imminent and substantial hazard to navigation or to the safety of any passenger on such vessel.