Wis. Stat. § 94.26
Any person owning lands adapted to the culture of cranberries may build and maintain on any land owned by the person such dams upon any watercourse or ditch as shall be necessary for the purpose of flowing such lands, and construct and keep open upon, across and through any lands such drains and ditches as shall be necessary for the purpose of bringing and flooding or draining and carrying off the water from such cranberry growing lands, or for the purpose of irrigation, fertilization and drainage of any other lands owned by the person; provided, that no such dams or ditches shall injure any other dams or ditches theretofore lawfully constructed and maintained for a like purpose by any other person.
Wis. Stat. § 94.26
This section exempts cranberry growers from the permit requirements of s. 30.18 for diversion of water for agricultural purposes. State v. Zawistowski, 95 Wis. 2d 250, 290 N.W.2d 303 (1980).