In counties of the third through eighth classes, when such bridge is to take the place of an existing bridge, the viewers may change the location thereof so that it may be located and built in the most suitable place, or at the least expense, or in the best manner, and, in the case of the change of location of such bridge, they shall also report what change in the course or bed of the road to be connected therewith will be necessary, and shall also report the vacation of the old or existing bridge, and the vacation of such portion of the road connecting therewith as they may deem proper.
16 P.S. § 2651