If a county bridge is destroyed or rendered impassable, the county commissioners may provide, at the expense of the county, ferries or other temporary ways as a substitute for the destroyed or impassable bridge, until the bridge has been rebuilt or rendered fit for public travel. If the bridge was maintained at the joint expense of two adjoining counties, the establishment and maintenance of the ferry or temporary way shall be by joint discretionary action of the boards of commissioners of both counties, and the expense shall be paid by the counties in the same proportions as the maintenance of the bridge was paid before it was destroyed or rendered impassable.
Pennsylvania Legal Code