The board of county commissioners, under limitations and restrictions as are prescribed by law, may:
(1) lay out, maintain, control, and manage county ferries within the county and, subject to 15-10-420, levy taxes for county ferries as provided by law;
(2) in the exercise of sound discretion, jointly with other counties, lay out, maintain, control, manage, and improve county ferries in adjacent counties, wholly or in part as may be agreed upon between the boards of the counties concerned, and subject to 15-10-420, levy taxes as provided by law.