(a) Before the district may construct a levee, bridge, or other improvement across or under any railroad improvement or right-of-way, any road, or any improvement of another district, the board must notify the proper railroad authorities, or other authorities of the additions or changes to result from the improvements planned by the district.
(b) The railroad authorities, or other authorities shall have 30 days from the day they receive the notice to agree or not to agree to do the work at their own expense to construct the improvements in their own manner.

(c) If a railroad or other authority undertakes to construct an improvement for the district, the design or manner of construction must be satisfactory to the district and must be approved by the commission.