New York Laws
Title 23 - River Improvement
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.

Structure New York Laws