Ind. Code § 36-9-27.4-25
(a) For the purposes of this chapter:
(3) an authorized representative of a county surveyor or drainage board;
has a right of entry over and upon a tract of land containing a drain or natural surface watercourse that is the subject of a petition filed under this chapter.
(b) The right of entry granted by this section is limited to the land lying within seventy-five (75) feet of the drain or natural surface watercourse. The seventy-five (75) feet must be measured at right angles to:
(3) the edge of any natural surface watercourse;
as determined by the county surveyor.
(c) A person exercising a right of entry under this section shall, to the extent possible, use due care to avoid damage to:
As added by P.L.239-1996, SEC.3 and P.L.240-1996, SEC.2.