Where any public ditch or drain constructed under the provisions of this article crosses a public highway or the right- of-way of any railroad, tramway, or any public utility, the cost of constructing such ditch or drain across such highway, railroad, tramway or other public utility shall be paid by the drainage district. When, in crossing such highway or right-of- way, the ditch or drain follows a natural water course or the natural flow of the water, and it becomes necessary to construct, enlarge or reconstruct any bridge, culvert, aqueduct or other structure, such structures shall be constructed so as to conform to the plans and specifications of the chief engineer as provided for in "the plan for reclamation," at the expense of the county in the case of crossing public highways, and at the expense of the railroad, tramway or other public utility when public utilities are involved. In all cases where the ditch or drain does not follow a natural watercourse but the water is diverted from its natural flow by the improvements, all necessary bridges, culverts, aqueducts and other structures across public highways, rights-of-way of railroads, tramways and other public utilities shall be constructed at the expense of the district, but such structures shall thereafter be maintained by and at the expense of the county or public utilities as the case may be.

Whenever it becomes necessary for any county or any public utility to construct, enlarge or reconstruct any bridge, culvert, aqueduct or other structure under the provisions in the paragraph immediately preceding, such changes shall be made within the time directed by the circuit court either in term or vacation. In case such changes or adjustments are not made within the prescribed time, the board of supervisors may proceed to make such necessary changes at the expense of the county or public utility.

In case it is necessary to pass any dredge boat or other equipment through a bridge, aqueduct, trestle or other structure of any railroad company or other public utility, county, district, or municipality, the board of supervisors shall give twenty days' notice to the owner of said structure that the same shall be removed temporarily by a certain date to allow the passage of such equipment, or that an agreement be immediately entered into in regard thereto. The owner of such structure shall keep an itemized account of the cost of the removal, and, if necessary, of the replacing of such structure, and such actual cost shall be paid by the district. In case the owner of such structure shall refuse to provide for the passage of such equipment, the board of supervisors may remove such structure at its own expense, interrupting traffic in the least degree consistent with good work and without delay or unnecessary damage. In case they shall be prevented from doing so, the owner of such structure shall be liable for damages for the resulting delay.