Photo: Ascended Dreamer · CC BY-SA 4.0Less hazard damage per building is expected in Dunbarton than in 76% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Dunbarton gets an A− for hazard risk: lower expected damage per building than 76% of U.S. towns, #11 of 126 in New Hampshire. Most of that expected damage is river and rain flooding (69%), then hurricanes (18%). FEMA’s files show no paid flood insurance claims here.
Graded on FEMA’s expected yearly building damage per dollar of building value (NRI v1.20, December 2025), weighted by where residents live; flood claims are shown, not graded. How hazard risk is graded
What Dunbarton faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
River and rain flooding
Hurricanes
Shares are of FEMA’s expected building damage, the measure the grade uses; ranks compare each hazard’s building-damage rate with all 85,154 U.S. census tracts. In FEMA’s terms, river and rain flooding is FEMA’s “Inland Flooding” (rivers and streams overflowing their banks, or rain overwhelming drainage). FEMA defines coastal flooding as high or rising tides and storm surge, so surge damage is counted there. Drought isn’t listed: FEMA counts its losses in crops only.
What’s behind Dunbarton’s grade
River and rain flooding is 69% of the building damage FEMA expects in Dunbarton, and Dunbarton’s rate of river and rain flooding damage is lower than 67% of U.S. census tracts. Ice storms add 4%, at a rate in the top 7% of U.S. census tracts.
A− #11 of 126 in New Hampshire; lower expected damage per building than 76% of U.S. towns (21,298).
All of Dunbarton’s residents live in one census tract; the figures are that tract’s.
The typical New Hampshire town has higher expected damage than 58% of U.S. towns; within the state, Dunbarton has less expected damage per building than 92% of New Hampshire towns.
In dollars, FEMA expects about $607K a year in losses across Dunbarton: $473K to buildings, the rest to people and crops.
Does Dunbarton flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Dunbarton. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Dunbarton isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Merrimack County.9 federal disasters brought FEMA money to Dunbarton
Disasters that paid out in Dunbarton itself (aid to households or repair grants to the Town of Dunbarton), newest first, with that year’s flood claims.
- 2013Severe Winter Storm and Snowstorm$12K to the Town of Dunbarton for repairs
- 2012Hurricane Sandy$4K to the Town of Dunbarton for repairs
- 2011Tropical Storm Irene$3K to the Town of Dunbarton for repairs
- 2010Severe Winter Storm$10K to the Town of Dunbarton for repairs
- 2008Severe Winter Storm$28K to the Town of Dunbarton for repairs
- 2006Severe Storms and Flooding13 households applied for aid$7K aid approved$36K to the Town of Dunbarton for repairs
Show all 9
- 2005Record And/or Near Record Snow$5K to the Town of Dunbarton for repairs
- 2003Snow$8K to the Town of Dunbarton for repairs
- 2001Snow$5K to the Town of Dunbarton for repairs
Merrimack County has had 24 natural disasters declared by the President since 1953, most often severe storms, then winter storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Old photos of Dunbarton after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Dunbarton archive →Dunbarton and its neighbors
Dunbarton has the lowest expected damage per building of the 6 graded towns here. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Dunbarton | A−less damage than 76% | river and rain flooding | 0 |
| Hooksett | Bless damage than 63% | river and rain flooding | 21 |
| Bow | Bless damage than 62% | river and rain flooding | 7 |
| Goffstown | B−more damage than 52% | river and rain flooding | 119 |
| Weare | Cmore damage than 66% | river and rain flooding | 7 |
| Hopkinton | Cmore damage than 75% | river and rain flooding | 3 |
Hazard risk = FEMA’s expected yearly building damage per dollar of building value, vs. the 21,298 U.S. towns we grade; the map is shaded by fifths of the same scale. Flood claims = paid federal flood insurance claims on record.
Get ready for what Dunbarton faces
A short kit for the hazards that drive the building damage here, what to check before you buy, and where neighbors get alerts.
- Turn around at flooded roads: a foot of moving water can carry off a car.
- Flood insurance usually takes 30 days to start, so buy it before the forecast.
- Keep papers and medicines up high, in a grab-and-go bag.
- The season runs June through November and peaks from mid-August to mid-October.
- Bring in porch furniture and anything the wind can throw.
- Fill the gas tank and charge phones before the storm arrives.
- Look up the address on FEMA’s flood map.
- Ask the seller or landlord whether it has ever flooded, and what flood insurance costs there.
- Get a flood insurance quote early: policies usually start 30 days after you buy.
Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.
Questions about natural hazards in Dunbarton
Is Dunbarton at risk for natural disasters?
On FEMA’s National Risk Index, Dunbarton has lower expected damage per building than 76% of U.S. towns: A− for hazard risk, #11 of 126 in New Hampshire. Most of the expected damage is river and rain flooding (69%) and hurricanes (18%). The figures are for the one census tract the town shares with its neighbors. This is FEMA’s model of an average year for today’s buildings, not a forecast.
Is Dunbarton in a flood zone?
Flood zones are drawn street by street, so the answer depends on the address: look it up on FEMA’s flood map. In Merrimack County, 20% of homes in mapped flood zones carry federal flood insurance, and 0.8% of all homes do.
How much is flood insurance in Dunbarton?
FEMA’s Community Rating System list shows no discount for Dunbarton’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
What was the biggest storm in Dunbarton?
By FEMA money that reached Dunbarton, Severe Storms and Flooding (2006): 13 households applied for aid, $7K approved, and $36K to the Town of Dunbarton for repairs.
Is Dunbarton at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (69%), and Dunbarton’s rate for it is lower than 67% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Dunbarton.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Dunbarton’s residents lived in the 2020 census; OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Homes: Census ACS 2020–24. Preparedness tips: Ready.gov. FEMA’s model is an average of expected damage, not a forecast. How hazard risk is graded.