Wisconsin Statutes Platting Lands (Ch. 236) § 236.025. Ordinary high water marks

(1) For purposes of ss. 236.15(1)(ag) and (d) and 236.20(2)(g), a professional land surveyor may do any of the following:

(2) For purposes of sub. (1)(b), the location of the approximate ordinary high water mark shall be the point on the bank of a navigable stream or on the shore of a lake up to which the presence and action of surface water is so continuous as to leave a distinctive mark by erosion, destruction of terrestrial vegetation, or other easily recognized characteristics. If the approximate location of the ordinary high water mark is difficult to determine, a professional land surveyor may consider other points on the bank or shore for purposes of approximating the location of the ordinary high water mark.

(3) For purposes of this section, a map, plat, or survey that shows an approximate ordinary high water mark shall state on its face that the mark is shown for reference only.