36 Pa. Stat. § 670-501
The department shall not assume for the Commonwealth any obligation to maintain, construct, or reconstruct any structure of any kind or character whatsoever situate upon or forming part of any township road taken over or designated as a part of the rural State highway system, except only drainage structures with a total spanned length not exceeding ten (10) feet, measured along the center line of the highway, and which were the sole obligation of the townships prior to the taking over of such road by the Commonwealth. Responsibility for the construction, reconstruction, and maintenance of any other structures shall remain with the county, township, person, association or corporation responsible therefor at the date of the approval of the act taking over the road.
36 P.S. § 670-501