http://www.swl.usace.army.mil/ Contact the Corps for more info., but 50 “commercial zone” around any dock structure in a marina. That means any rented dock,. gas pump or not, period. NOR can the owner of the dock fish, swim, dive, etc,,,in that zone ! Any law enforcement div. can cite according to my info., sherrif, corps, AGFC, etc,,,, If they so desire to do so ! But this is true in the Little Rock district, and you should contact them for more information, please ! D.