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Montana Statewide Rule

Montana Floodplain Management Statewide Requirements

Heavy RestrictionsApplies statewide across Montana (2026)

Key Facts

Statewide framework
DNRC oversees
Permit required
100-year floodplain
Elevation rule
Above base flood
Statute
MCA 76-5-101
Federal alignment
NFIP minimums
Last verified: August 21, 2026Source: Montana Legislature

Summary

The Montana Floodplain and Floodway Management Act (Title 76, Ch. 5, MCA) requires DNRC-approved local floodplain regulations meeting NFIP standards. State minimum standards apply uniformly; local governments may exceed but not weaken them.

(1) Upon transmittal of the flood plain information to officials of a political subdivision, the political subdivision has 6 months from the date of transmittal to adopt land use regulations that meet or exceed the minimum standards of the department. The regulations may include, for the purposes of flood plain management only, flood plain management regulations within sheetflood areas as determined by the federal emergency management agency.

Source: Montana LegislatureView official code

Full Breakdown

Under MCA 76-5-101 et seq., Montana requires every community participating in the National Flood Insurance Program to adopt floodplain regulations approved by the Department of Natural Resources and Conservation (DNRC). State law establishes minimum standards for development in mapped 100-year floodplains: residential structures must be elevated above the base flood elevation, and certain uses (like hospitals or storage of toxic materials) are prohibited in the floodway. Municipalities and counties administer permits but cannot adopt regulations less restrictive than DNRC rules. Permits are required before construction, fill, or substantial improvements within mapped floodplains.

Violations & Penalties

Construction without a floodplain permit may result in civil penalties up to $500 per day, mandatory removal, and loss of NFIP flood insurance eligibility for the property.

Frequently Asked Questions

Who issues floodplain permits in Montana?
Local governments (cities and counties) issue floodplain development permits, but they must apply DNRC-approved standards consistent with state and federal NFIP minimums under MCA 76-5-301.
Can a Montana city allow building below base flood elevation?
No. State minimums require residential structures to be elevated above base flood elevation. Local governments may impose stricter freeboard requirements but cannot weaken the standard.

Sources

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