Can a marina operator or lakeside landowner keep boaters away from his docks?
Not on public water. If a lake is public water, the public has the right to boat the entire lake, and to fish from a boat (subject to regulation by government entities).31 A person who interferes with a lawful boater may be committing the crime of obstructing a waterway and/or harassment. Both are Class B misdemeanors.32 By the same token, a boater who unreasonably obstructs access to or from a dock or boat slip may be guilty of obstructing a waterway.
