Indiana Code Title 8. Utilities and Transportation § 8-21-10-7

(1) an existing public use airport;  and

(2) a public use heliport.

(1) A height that is five hundred (500) feet above ground level at the site of the object anywhere in the state.

(2) A height that is two hundred (200) feet above ground level or above the established airport elevation, whichever is higher, within three (3) nautical miles of the established reference point of a public-use airport, excluding heliports, and that height increases in the proportion of one hundred (100) feet for each additional nautical mile of distance from the airport up to a maximum of five hundred (500) feet.

(3) A height within a terminal obstacle clearance area, including an initial approach segment, a departure area, and a circling approach area, as defined by federal law and regulations, which would result in the vertical distance between any point on the object and an established minimum instrument flight altitude within that area or segment to be less than the required obstacle clearance.

(4) A height within an enroute obstacle clearance area, as defined by federal law and regulations, including turn and termination areas of a federal airway or approved off-airway route that would increase the minimum obstacle clearance altitude.

(5) The surface of a takeoff and landing area of a public-use airport or heliport or any imaginary surface as established under section 8 of this chapter.  However, no part of the takeoff or landing area itself will be considered to be an obstruction.

(1) Seventeen (17) feet for an interstate highway where overcrossings are designed for a minimum of seventeen (17) feet vertical distance.

(2) Fifteen (15) feet for any other public roadway.

(3) Ten (10) feet or the height of the highest mobile object that would normally traverse the road, whichever is greater, for a private road.

(4) Twenty-three (23) feet for a railroad.

(5) For a waterway or any other traverse way not covered by subdivisions (1) through (4), an amount equal to the height of the highest mobile object that would normally traverse it.