New York Laws
Article 9 - Rivers and Streams as Public Highways
120 - Dams and Bridges.

§ 120. Dams and bridges. No dam shall be erected on any river or
stream in this state, recognized by law or use as a public highway for
the purpose of floating and running lumber, logs or other timber, over
or upon the same, unless there be built in such dam an apron, at least
fifteen feet in width, in the middle of the current of such river or
stream, of a proper slope for the safe passage of lumber, logs and other
timber. No bridge shall be built over any such river or stream in such a
manner as to obstruct or prevent the free and uninterrupted passage of
lumber, logs and other timber down and along such river or stream.

Structure New York Laws