Unauthorized structures

Wis. Stat. § 30.122
in effect
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All permanent alterations, deposits or structures affecting navigable waters, other than boathouses, which were constructed before December 9, 1977 and which did not require a permit at the time of construction, shall be presumed in conformity with the law, unless a written complaint is filed within 180 days of December 9, 1977. Upon the filing of a complaint, the department shall proceed with an action to enforce the applicable statutes.
Source: WI Statutes (Official Site)URL: https://docs.legis.wisconsin.gov/document/statutes/30.122Fetched: 10/7/2026