If it is necessary to pass any dredge boat or other equipment through a bridge or grade of any railroad company or other corporation, county, township, or municipal corporation, the board of directors of the conservancy district shall give twenty days’ notice to the owner of said bridge or grade that the same shall be removed temporarily to allow the passage of such equipment or that an agreement be immediately entered into in regard thereto. The owner of said bridge or grade shall keep an itemized account of the cost of the removal, and, if necessary, of the replacing of said bridge or grade, and said actual cost shall be paid by the district. If the owner of said bridge or grade refuses to provide for the passage of said equipment, the board may remove such bridge or grade at its own expense, interrupting traffic in the least degree consistent with good work and without delay or unnecessary damage. If the board is prevented from doing so, the owner of said bridge or grade shall be liable for damage for the resulting delay.