No county legislative body shall permit a bridge, milldam, fish trap, or other improvement to be so constructed as to interrupt or in any way injure or impair the navigation of the streams that are naturally navigable, or that have been declared to be so by law.
Navigable stream — Obstructions prohibited
Tenn. Code Ann. § 54-13-102, under Private and Local Improvements.
Tenn. Code Ann. § 54-13-102