16 Pa. Stat. § 2635
he commissioners may enter into a contract or lease with any street railway, telegraph or telephone company or other public utility, their successors or assigns, desiring to use a county bridge and its approaches for other than ordinary public foot or vehicular traffic for the concurrent use of such portion of said public bridge and approaches as will not substantially impair or restrict the public use and enjoyment thereof, upon such terms and conditions as shall be agreed upon, and may charge tolls or rentals for such special use. No such contract or lease shall be entered into for a longer period than twenty years nor shall any such contract or lease be entered into unless approved by the Public Utility Commission or become effective except in accordance with the provisions of the Public Utility Law.
16 P.S. § 2635