Lynn, MA Environmental Rules: Flood Elevation Requirements (2026)

11 uses whichever number is less, 50 lots or 5 acres, so a compact but dense subdivision can trigger the requirement before a sprawling but sparse one does. 10's broader review standard for all subdivision and development proposals in the district, which the city assesses to confirm the project minimizes flood damage, that public utilities and facilities are sited and built to minimize flood damage, and that adequate drainage is provided. 8 directs the building department to obtain, review and reasonably use base flood elevation and floodway data from any federal, state or other source as the criteria for elevating residential structures to or above base flood level, floodproofing or elevating nonresidential structures, and prohibiting floodway encroachments.

15 further obligates the city to notify FEMA, the NFIP State Coordinator, the Massachusetts Department of Conservation and Recreation and the NFIP Program Specialist within six months whenever the city acquires data that changes a mapped base flood elevation, submitting the supporting technical or scientific data with that notice.