Wisconsin Floodplain Zoning — Wis. Stat. § 87.30 + NR 116 (WI)

Tracked preemption from the Wisconsin overlay bundle.

Overview

Effective
1965-01-01
Sunset
Authority
state
Scope
state:WI

Trigger predicate

When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.

parcel.in_designated_floodplain == True

Preempted fields

3 fields on the base district schema are rewritten when the trigger fires.

FieldOpValueNote
review_typerequirelocal_floodplain_zoning_per_NR_116§87.30 requires counties, cities, and villages to adopt floodplain zoning consistent with NR 116 within one year of adequate hydraulic data. Once DNR adopts a floodplain ordinance for a non-compliant locality, local officials must administer it as if locally adopted; local modifications require DNR written consent.
base_districts[*].min_finished_floor_elevation_ftfloor_atbase_flood_elevation_plus_2_ft_freeboardNR 116 establishes a 2-ft freeboard requirement above the base flood elevation for residential construction in the floodway fringe; structures generally prohibited in the floodway.
base_districts[*].allowed_usesrestrictsubject_to_floodway_and_floodfringe_use_tables

Citation

Authority source
Wis. Stat. § 87.30; Wis. Admin. Code NR 116
https://docs.legis.wisconsin.gov/document/statutes/87.30

Research notes

State-mandated floodplain regime coordinated with FEMA NFIP. Local participation in NFIP is conditioned on adoption of an NR 116-compliant ordinance. DNR has a state-substitution remedy if a local unit fails to act (§87.30(1)(b)). Federal conflict check enabled for NFIP coordination.