Section 455

Any person who-

(1) wilfully and unlawfully removes or disturbs any fixed objects or materials used for securing a bank or wall of a river, canal, aqueduct, reservoir, or inland water, or for securing any work which appertains to a dock, canal, aqueduct, reservoir, or inland water, or which Is used for purposes of navigation or lading or unlading goods; or

(2) unlawfully does any act with intent to obstruct the carrying on, completion, or maintenance of the navigation of a navigable river or canal, and thereby obstructs such carrying on, completion, or maintenance;

is guilty of a felony, and is liable to imprisonment for seven years.