No owner or occupant of premises on which a pier/dock, bulkhead, boat hoist, mooring buoy, or other waterfront structure has deteriorated or fallen into disrepair or has been damaged by fire, ice, or other casualty shall permit the use thereof, and the owner or occupant shall either remove the unsafe structure or place it in a safe and sound condition. Until removed or placed in a safe and sound condition, the owner or occupant shall post a warning notice and block access thereto.