The State of South Dakota, by and through the department, may accept title to and responsibility for the repair, maintenance, and ownership of that portion of any existing toll bridge situated within the boundaries of the State of South Dakota, if:
(1) That portion of the bridge is offered to this state by its owners free of existing bonded indebtedness and current costs of operation; and
(2) Any adjoining state in which the remainder of the bridge is situated signifies its intention, by and through its proper governmental instrumentality, having control and supervision over state bridges, of accepting title to and responsibility for the repair, maintenance, and ownership of the portion of the bridge situated in the adjoining state.