313.12  Supervision and inspection.
  The department is expressly charged with the duty of supervision, inspection and direction of the work of construction of primary roads on behalf of the state, and of supervising the expenditure of all funds paid on account of such work by the state or the county on the primary system and it shall do and perform all other matters and things necessary to the faithful completion of the work herein authorized.
[C24, §4701; C27, 31, 35, §4755-b12; C39, §4755.12; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §313.12]