R.I. Gen. Laws § 24-5-20: Bridges on boundary lines.

All public bridges, except such as are part of the state highway system, on the dividing lines between towns shall be established and kept in repair at the expense of the towns adjoining the bridges; and every public bridge except such as are part of the state highway system on the dividing line between this state and the adjoining states shall be established and kept in repair, on the part of this state, at the expense of the town adjoining the bridge.