More hazard damage per building is expected in Manlius Township than in 64% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Manlius Township gets a C+ for hazard risk: higher expected damage per building than 64% of U.S. towns, #499 of 768 in Illinois. Most of that expected damage is river and rain flooding (90%). Flood insurance has paid 8 claims here since 1992.
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 Manlius Township 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 Manlius Township’s grade
River and rain flooding is 90% of the building damage FEMA expects in Manlius Township, and Manlius Township’s rate of river and rain flooding damage is higher than 80% of U.S. census tracts. Next is tornadoes at 5% (higher than 63% of U.S. census tracts).
C+ #499 of 768 in Illinois; higher expected damage per building than 64% of U.S. towns (21,298).
Manlius Township’s residents live in 2 census tracts; FEMA’s figures are combined by where they live.
The typical Illinois town has higher expected damage than 54% of U.S. towns; within the state, Manlius Township has more expected damage per building than 65% of Illinois towns.
In dollars, FEMA expects about $4.2M a year in losses across Manlius Township: $3.0M to buildings, the rest to people and crops.
Does Manlius Township flood? Rarely: 8 flood claims since 1992
Every paid claim on a federal flood insurance policy in Manlius Township, from FEMA’s records: 2.8 per 1,000 homes, fewer than 53% of the 13,809 U.S. towns with a flood insurance record.
- The Mid-spring storms2 claims · $23K
Manlius Township 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.The storms Manlius Township remembers
None of the 17 disasters declared for La Salle County shows FEMA aid or repair money reaching Manlius Township itself in FEMA’s records, so these are its biggest flood-claim years.
- 20132 flood claims paidThe year of Severe Storms, Straight-line Winds, and Tornadoes, declared for La Salle County
- 19921 flood claims paidThe year of Flooding, declared for La Salle County
- 20111 flood claims paidThe year of Severe Winter Storm and Snowstorm, declared for La Salle County
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 Manlius Township after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Manlius Township archive →Manlius Township and its neighbors
Manlius Township 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 |
|---|---|---|---|
| Manlius Township | C+more damage than 64% | river and rain flooding | 8 |
| Seneca | Cmore damage than 69% | river and rain flooding | 21 |
| Marseilles | C−more damage than 76% | river and rain flooding | 11 |
| Brookfield Township | C−more damage than 79% | river and rain flooding | 21 |
| Rutland Township | C−more damage than 80% | river and rain flooding | 8 |
| Erienna Township | Dmore damage than 87% | river and rain flooding | 34 |
| Miller Township | — | 590 residents; we grade 1,000+ | |
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 Manlius Township 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 Manlius Township
Is Manlius Township at risk for natural disasters?
On FEMA’s National Risk Index, Manlius Township has higher expected damage per building than 64% of U.S. towns: C+ for hazard risk, #499 of 768 in Illinois. Most of the expected damage is river and rain flooding (90%) and tornadoes (5%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Manlius Township flood?
Flood insurance has paid 8 claims in Manlius Township since 1992, $122K in all, or 2.8 per 1,000 homes, fewer than 53% of U.S. towns with a flood insurance record. The most claims came from Mid-spring storms (2).
Is Manlius Township 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 Manlius Township?
FEMA’s Community Rating System list shows no discount for Manlius Township’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 Manlius Township?
By flood claims, Mid-spring storms: 2 paid, $23K.
Is Manlius Township at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (90%), and Manlius Township’s rate for it is higher than 80% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Manlius Township.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Manlius Township’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.