Any bridge, abutment, and approach or repair to a bridge required in any county of this state, shall be constructed in accordance with plans and specifications prepared by the department or a registered engineer retained by the board of county commissioners for such purpose. The plans and specifications shall show and describe the style and size thereof, the kind, weight, and quality of all materials to be used in the construction and the proper proportion of the ingredients for mixture and reinforcements.
SDCL 31-14-4