Wash. Rev. Code § 77.15.310
(1) A person is guilty of unlawful failure to use or maintain an approved fish guard on a diversion device if the person owns, controls, or operates a device used for diverting or conducting water from a lake, river, or stream and:
[ 2009 c 333 s 3; 2003 c 39 s 38; 2000 c 107 s 240; 1998 c 190 s 53.]