Wis. Stat. § 76.16

After the property of a company is first valued as a whole, if any repair facilities, docks, ore yards, piers, wharves, grain elevators or car ferries used in transferring freight or passengers between cars and vessels or transfer of freight cars located on car ferries, or if any terminal storage facilities, docks, pipelines and pumping equipment used in transferring oil from pipelines to vessels shall be included in such valuation, then for the purpose of accounting to the proper taxation districts, the department shall make a separate valuation of each such repair facility, dock, ore yard, pier, wharf, grain elevator, including the approaches thereto, or car ferries and of each such terminal storage facility, dock, pipeline and pumping equipment. As used herein, an approach shall be an immediate access facility commencing at the switching point which leads primarily to the terminal facility. For the purpose of defining the pipeline terminal facilities affected by this section, such facilities shall begin where the incoming pipeline enters the terminal storage facility site used in the transfer of oil to vessels.