53 Pa. Stat. § 16863
The owners and lessees of the wharf on the south side of Queen street, in the district of Southwark, Philadelphia, and of the two docks on each side of it now occupied by the Pennsylvania Steamship Company, shall have the exclusive right to use and occupy the same for the purposes of any steamship or other vessel owned or chartered by, or consigned to them, or of any barge or barges, or other vessels used in the loading and unloading thereof; and at the request of such owner or lessee, it shall be the duty of the harbor master of the port of Philadelphia forthwith to remove or cause to be removed any vessel or vessels which shall be so moored or laying as to obstruct the free ingress and egress to or from or the use and occupancy as aforesaid of either the said wharf, docks, or berth or berths, opposite the river front, owned or leased as aforesaid: Provided, That the usual charge for occupancy in such cases be paid by said steamship company, to the owner or owners of such side wharves.
53 P.S. § 16863