Ind. Code § 8-1-23-1
Whenever, in the opinion of any board of county commissioners, the use of any public county highway or highways shall be or will become impracticable or unsafe because of obstructions or interruptions resulting from erosion, changes in natural or artificial drains, or any other cause of any kind or nature whatsoever, the said board of county commissioners of the county wherein such highway or highways is located, or the boards of county commissioners of adjoining counties acting together, if the obstructed or interrupted part thereof is located upon a county line or extends from one county to another, shall have the power to close said highway or highways, or the necessary parts thereof, and divert traffic therefrom by suitable detours, if in their judgment such detours are necessary, until such time as the conditions causing such obstruction or interruption no longer exists and the continued use of said highway or highways become practicable and safe.
IC 8-1-23-1