Photo: IvoShandor · CC BY-SA 3.0FEMA expects more hazard damage per building in Seneca than in 69% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Seneca gets a C for hazard risk: higher expected damage per building than 69% of U.S. towns. Most of that expected damage is river and rain flooding (90%). Flood insurance has paid 21 claims here since 1979.
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 Seneca 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
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 Seneca’s grade
River and rain flooding is 90% of the building damage FEMA expects in Seneca, and Seneca’s rate of river and rain flooding damage is higher than 83% of U.S. census tracts.
C higher expected damage per building than 69% of U.S. towns (21,298).
Seneca’s residents live in 3 census tracts; FEMA’s figures are combined by where they live.
In dollars, FEMA expects about $1.7M a year in losses across Seneca: $1.3M to buildings, the rest to people and crops.
Does Seneca flood? Sometimes: 21 flood claims since 1979
Every paid claim on a federal flood insurance policy in Seneca, from FEMA’s records: 21.7 per 1,000 homes, more than 85% of the 13,809 U.S. towns with a flood insurance record.
- Hurricane Ike5 claims · $207K
- The Mid-spring storms3 claims · $102K
Seneca isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: La Salle County.4 federal disasters brought FEMA money to Seneca
Disasters that paid out in Seneca itself (aid to households or repair grants to the Village of Seneca), newest first, with that year’s flood claims.
- 2013Severe Storms, Straight-line Winds, and Flooding15 households applied for aid$35K aid approved3 flood claims paid that year
- 2008Severe Storms and Flooding3 households applied for aid$11K aid approved5 flood claims paid that year
- 2007Severe Storms and Flooding57 households applied for aid$98K aid approved1 flood claim paid that year
- 1999Il-winter Storm 1/1/99$5K to the Village of Seneca for repairs
La Salle County has had 17 natural disasters declared by the President since 1953, most often severe storms, then floods. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Old photos of Seneca after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Seneca archive →Seneca and its neighbors
Seneca is 2nd of the 3 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 |
|---|---|---|---|
| Manlius Township | C+more damage than 64% | river and rain flooding | 8 |
| Seneca | Cmore damage than 69% | river and rain flooding | 21 |
| Brookfield Township | C−more damage than 79% | river and rain flooding | 21 |
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 Seneca 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.
- 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 Seneca
Is Seneca at risk for natural disasters?
On FEMA’s National Risk Index, Seneca has higher expected damage per building than 69% of U.S. towns: C for hazard risk. Most of the expected damage is river and rain flooding (90%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Seneca flood?
Flood insurance has paid 21 claims in Seneca since 1979, $519K in all, or 21.7 per 1,000 homes, more than 85% of U.S. towns with a flood insurance record. 1 properties have flooded more than once. The most claims came from Hurricane Ike (5).
Is Seneca 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 La Salle County, 20% of homes in mapped flood zones carry federal flood insurance, and 0.5% of all homes do.
How much is flood insurance in Seneca?
FEMA’s Community Rating System list shows no discount for Seneca’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 Seneca?
By FEMA money that reached Seneca, Severe Storms and Flooding (2007): 57 households applied for aid, $98K approved. By flood claims, Hurricane Ike: 5 paid, $207K.
Is Seneca at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (90%), and Seneca’s rate for it is higher than 83% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Seneca.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Seneca’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.