36 Pa. Stat. § 3225
Upon the acquisition of any such bridge by the Commonwealth of Pennsylvania and the State of New York, the same shall remain in the charge and control of said joint commission or their successors. Such bridge shall thereafter be maintained jointly by the Commonwealth of Pennsylvania and the State of New York, shall be kept in constant repair, and shall be rebuilt when destroyed. The one-half of any and all expense connected with such maintenance, repair, or rebuilding of the bridge proper shall be paid by the Commonwealth of Pennsylvania; maintenance, repair or rebuilding of bridge approaches shall be paid entirely by the Commonwealth of Pennsylvania if the bridge approach is in Pennsylvania; if the bridge approach is in New York, the Commonwealth shall have no liability for payment of maintenance, repair or rebuilding costs thereof.
36 P.S. § 3225