2006 New York Code - Unlawful Interference With Improvement Works.

 
  § 15-2315. Unlawful interference with improvement works.
    It  shall  be  unlawful  for  any  person  to damage, alter, change or
  interfere with any works constructed under the provisions of title 23 or
  to open or close, or cause to be opened or closed, a gate  or  gates  in
  any  dam  or  dike  or  a  gate in any head race or obstruct any channel
  constructed  under  title  23  so  far  as  the  same  relates  to  such
  improvements,   without   the  consent  of  the  department.  After  the
  improvement of any channel or watercourse has been authorized  it  shall
  be  unlawful  for any person or public authority to construct any dam or
  other structure on the bed of such stream or any bridge across it  until
  the  department  has  found  that  such  construction or bridge will not
  unduly affect the projected or completed improvement.