FEMA Flood Zone Lookup in New Hampshire

New Hampshire faces flood risk from the Connecticut and Merrimack rivers, urban flash flooding in the southern tier, and coastal flooding along its 18-mile seacoast. The Connecticut River forms the state's western border and regularly floods its valley with the 1927, 1936, and 1987 floods causing significant damage. The Merrimack River floods through Concord and Manchester with the 2005 and 2008 events causing tens of millions in damage. The January 2024 winter storm brought record storm surge to the seacoast damaging Hampton Beach and other coastal communities. Flash flooding is an increasing concern in the southern part of the state where rapid development has increased impervious surfaces. The Souhegan, Piscataquog, and Exeter rivers have all experienced flash flood events. The state's mountainous terrain in the north creates concentrated runoff events. New Hampshire has approximately 120 NFIP-participating communities with high-risk zones concentrated along the Connecticut and Merrimack river valleys and the seacoast. Sea level rise is expected to increase coastal flood frequency along the short but vulnerable Atlantic coastline.