33 C.F.R. § 147.807

(a) Description. The West Delta 143 Platform is located at position 28°39′42″ N, 89°33′05″ W. The area within 500 meters (1640.4 feet) from each point on the structure's outer edge, not to extend into the adjacent Mississippi River Approach Fairway, is a safety zone.

(b) Regulation. No vessel may enter or remain in this safety zone except: (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 Heartland District.