Photo: Paul Sableman · CC BY 2.0On FEMA’s figures, Gahanna faces about as much hazard damage per building as the typical U.S. town, mostly from river and rain flooding
On FEMA’s National Risk Index, Gahanna gets a B for hazard risk: lower expected damage per building than 56% of U.S. towns, #768 of 993 in Ohio. Most of that expected damage is river and rain flooding (87%). Flood insurance has paid 28 claims here since 1978.
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 stands out about Gahanna’s natural hazards
From FEMA’s model and FEMA’s records, below.
What Gahanna 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
Tornadoes
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 Gahanna’s grade
River and rain flooding is 87% of the building damage FEMA expects in Gahanna, and Gahanna’s rate of river and rain flooding damage is higher than 67% of U.S. census tracts. Next is tornadoes at 7% (higher than 64% of U.S. census tracts).
B #768 of 993 in Ohio; lower expected damage per building than 56% of U.S. towns (21,298).
Gahanna’s residents live in 10 census tracts; FEMA’s figures are combined by where they live.
The typical Ohio town has lower expected damage than 79% of U.S. towns; within the state, Gahanna has more expected damage per building than 77% of Ohio towns.
In dollars, FEMA expects about $10.5M a year in losses across Gahanna: $8.2M to buildings, the rest to people and crops.
Does Gahanna flood? Sometimes: 28 flood claims since 1978
Every paid claim on a federal flood insurance policy in Gahanna, from FEMA’s records: 1.9 per 1,000 homes, fewer than 63% of the 13,809 U.S. towns with a flood insurance record.
Gahanna isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Franklin County.7 federal disasters brought FEMA money to Gahanna
Disasters that paid out in Gahanna itself (aid to households or repair grants to the City of Gahanna), newest first, with that year’s flood claims.
- 2012Severe Storms and Straight-line Winds$46K to the City of Gahanna for repairs
- 2008Severe Wind Storm Associated with Tropical Depression Ike$91K to the City of Gahanna for repairs
- 2008Record Snow and Near Record Snow$44K to the City of Gahanna for repairs
- 2004Severe Winter Storms, Flooding, and Mudslides45 households applied for aid$12K aid approved$43K to the City of Gahanna for repairs
- 2004Snow$34K to the City of Gahanna for repairs
- 2003Tornadoes, Flooding, Severe Storms, and High Winds50 households applied for aid$82K aid approved
Show all 7
- 2003Severe Winter Storm and Record/near Record Snow$21K to the City of Gahanna for repairs
Franklin County has had 17 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 Gahanna after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Gahanna archive →Gahanna and its neighbors
Gahanna is 4th of the 4 graded towns here, from least expected damage per building to most. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Jefferson Township | A−less damage than 85% | river and rain flooding | 1 |
| Columbus | B+less damage than 67% | river and rain flooding | 429 |
| Mifflin Township | Bless damage than 58% | river and rain flooding | 12 |
| Gahanna | Bless damage than 56% | river and rain flooding | 28 |
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 Gahanna 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.
- Pick your spot now: the lowest floor, an inside room, no windows.
- A watch means be ready; a warning means take cover now.
- Keep shoes and a flashlight by the bed.
- 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 Gahanna
Is Gahanna at risk for natural disasters?
On FEMA’s National Risk Index, Gahanna has lower expected damage per building than 56% of U.S. towns: B for hazard risk, #768 of 993 in Ohio. Most of the expected damage is river and rain flooding (87%) and tornadoes (7%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Gahanna flood?
Flood insurance has paid 28 claims in Gahanna since 1978, $139K in all, or 1.9 per 1,000 homes, fewer than 63% of U.S. towns with a flood insurance record. 3 properties have flooded more than once.
Is Gahanna 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 Franklin County, 17% of homes in mapped flood zones carry federal flood insurance, and 0.3% of all homes do.
How much is flood insurance in Gahanna?
FEMA’s Community Rating System list shows no discount for Gahanna’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 Gahanna?
By FEMA money that reached Gahanna, Severe Wind Storm Associated with Tropical Depression Ike (2008): $91K to the City of Gahanna for repairs.
Is Gahanna at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (87%), and Gahanna’s rate for it is higher than 67% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Gahanna.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Gahanna’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.