33 C.F.R. § 147.1116

(a) Description: The area within a line 500 meters from each point on the structure's outer edge. The position of the center of the structure is 34°-36′-37.5″ N, 120°-43′-46″ W.

(b) Regulation: No vessel may enter or remain in this safety zone except the following: (1) An attending vessel; (2) a vessel under 100 feet in length overall not engaged in towing; or (3) a vessel authorized by the Commander, USCG Southwest District.