1. All bridges contemplated by sections 242.010 to 242.690 and all enlargements of bridges already in existence shall be built and enlarged according to and in compliance with the plans, specifications and orders made or approved by the chief engineer of the district.

2. If any such bridge shall belong to any corporation, or be needed over a public highway or right-of-way of any corporation, the secretary of said board of supervisors shall give such corporation notice by delivering to its agent or officer, in any county wherein said district is situate, the order of the board of supervisors of said district declaring the necessity for the construction or enlargement of said bridge. A failure to construct or enlarge such bridge within the time specified in such order shall be taken as a refusal to do said work by said corporation, and thereupon the said board of supervisors shall proceed to let the work of constructing or enlarging the same at the expense of the corporation for the cost thereof, which costs shall be collected by said board of supervisors from said corporation, by suit therefor, if necessary. But before said board of supervisors shall let such work, it shall give some agent or officer of said corporation, now authorized by the laws of this state to accept service of summons for said corporation, at least twenty days’ actual notice of the time and place of letting such work.

3. Any owner of land within or without the district may, at his own expense, and in compliance with the terms and provisions of sections 242.010 to 242.690, construct a bridge across any drain, ditch, canal or excavation in or out of said district.

4. All drainage districts shall have full authority to construct and maintain any ditch or lateral provided in its plan for reclamation, across any of the public highways of this state, without proceedings for the condemnation of the same, or being liable for damages therefor. Within ten days after a dredge boat or any other excavating machine shall have completed a ditch across any public highway, a bridge adjudged sufficient by the county commission of said county or counties shall be constructed over such drainage ditch where the same crosses such highway, and after such bridge has been constructed it shall become a part of the road over which it is constructed and shall be maintained by the authority authorized by law to maintain the road of which it becomes a part.

5. When any drainage district has heretofore constructed or shall hereafter construct a bridge over a drainage ditch where the same crosses any public highway, said drainage district shall not be under obligation thereafter to further maintain or reconstruct any such bridge or bridges for more than twenty years after it first constructed or constructs such bridge at said place. If said bridge has been constructed by the drainage district and has become a part of said road and is then destroyed the authorities having control of the road are authorized, if they desire, to reconstruct such bridge, provided, however, the word corporation as used in this section shall not apply to the state or any political or civil subdivision thereof.