Indiana Code Title 8. Utilities and Transportation § 8-14-9-2.5

(1) other than a bridge where construction improvements have been made in the stream, river, or lake bed to provide a firm surface for vehicles to travel across the water course;  and

(2) that is designed and constructed to be passable to traffic most of the year during periods of ordinary stream flow but is impassable to traffic during periods of high water.

(1) Installing appropriate road signs to warn vehicle drivers as they approach a low water crossing.

(2) Replacing damaged, undersized, perched, and blocked road structures in a low water crossing with structures that will accommodate a greater quantity of stream flow under the road.

(3) Replacing a low water crossing with a bridge.