No person shall, by means of rack, screen, weir or other obstruction, in any stream or river, or the inlet or outlet of a public pond, prevent the passage of fish except as provided in RSA 211:8-c.
N.H. Rev. Stat. Ann. § 211:8
Obstructions
Source
Official source: New Hampshire General Court. Reproduced from public-domain New Hampshire statutes; confirm against the official source for the current text. Not legal advice.