(1) Under the direction and supervision of the board of county commissioners, the superintendent shall furnish plans and specifications for highway or bridge work. The superintendent is the presiding officer of all boards of road viewers.
(2) Under direction and supervision, the superintendent shall:
(a) take charge of all roads, bridges, and causeways under the jurisdiction of the county;
(b) open all new roads when they are established and ordered to be opened by the board;
(c) perform, at the time and in the manner directed by the board, whatever is lawfully directed by the board concerning the public highways under the jurisdiction of the county.