FEMA flood zone rules in Billings, MT — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Billings regulates construction within the FEMA-mapped Yellowstone River floodplain through floodplain permits, elevation requirements, and prohibitions on fill or structures that increase flood heights downstream.
Billings administers floodplain rules under Montana DNRC and FEMA NFIP standards. Properties along the Yellowstone River and tributary draws fall within Special Flood Hazard Areas mapped on the city FIRM panels. New residential structures must elevate the lowest floor at least one foot above base flood elevation. Substantial improvements exceeding fifty percent of structure value trigger full compliance. Floodway encroachments that raise water surface elevation are prohibited. Permits are reviewed by Billings Public Works floodplain administrator before any building permit issues.
Unpermitted floodplain construction triggers stop-work orders, mandatory removal, and loss of NFIP flood insurance eligibility for the structure.
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