On FEMA’s figures, Aux Sable Township 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, Aux Sable Township gets a B for hazard risk: lower expected damage per building than 58% of U.S. towns, #244 of 768 in Illinois. Most of that expected damage is river and rain flooding (78%), then tornadoes (13%). Flood insurance has paid 66 claims here since 1981.
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 Aux Sable 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
Strong wind
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 Aux Sable Township’s grade
River and rain flooding is 78% of the building damage FEMA expects in Aux Sable Township, and Aux Sable Township’s rate of river and rain flooding damage is higher than 57% of U.S. census tracts. Strong wind adds 5%, at a rate in the top 7% of U.S. census tracts.
B #244 of 768 in Illinois; lower expected damage per building than 58% of U.S. towns (21,298).
Aux Sable Township’s residents live in 3 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, Aux Sable Township has less expected damage per building than 68% of Illinois towns.
In dollars, FEMA expects about $11.9M a year in losses across Aux Sable Township: $5.0M to buildings, the rest to people and crops.
Does Aux Sable Township flood? Sometimes: 66 flood claims since 1981
Every paid claim on a federal flood insurance policy in Aux Sable Township, from FEMA’s records: 12.2 per 1,000 homes, more than 77% of the 13,809 U.S. towns with a flood insurance record.
- The Mid-spring storms19 claims · $963K
- Hurricane Ike8 claims · $318K
Aux Sable 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: Grundy County.2 federal disasters brought FEMA money to Aux Sable Township
Disasters that paid out in Aux Sable Township itself (aid to households or repair grants to Aux Sable Township), newest first, with that year’s flood claims.
- 2011Severe Winter Storm and Snowstorm$10K to Aux Sable Township for repairs
- 1999Il-winter Storm 1/1/99$4K to Aux Sable Township for repairs
Grundy County has had 12 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 Aux Sable Township after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Aux Sable Township archive →Aux Sable Township and its neighbors
Aux Sable 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 |
|---|---|---|---|
| Aux Sable Township | Bless damage than 58% | river and rain flooding | 66 |
| Minooka | C+more damage than 57% | river and rain flooding | 7 |
| Seward Township | C+more damage than 58% | river and rain flooding | — |
| Channahon Township | C+more damage than 59% | river and rain flooding | 60 |
| Goose Lake Township | Cmore damage than 75% | river and rain flooding | 105 |
| Saratoga Township | C−more damage than 78% | river and rain flooding | 14 |
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 Aux Sable 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.
- Trim dead limbs over the house and driveway.
- Tie down trash cans and outdoor furniture.
- Stay clear of downed lines and call the utility.
- 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 Aux Sable Township
Is Aux Sable Township at risk for natural disasters?
On FEMA’s National Risk Index, Aux Sable Township has lower expected damage per building than 58% of U.S. towns: B for hazard risk, #244 of 768 in Illinois. Most of the expected damage is river and rain flooding (78%) and tornadoes (13%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Aux Sable Township flood?
Flood insurance has paid 66 claims in Aux Sable Township since 1981, $2.2M in all, or 12.2 per 1,000 homes, more than 77% of U.S. towns with a flood insurance record. The most claims came from Mid-spring storms (19).
Is Aux Sable 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 Grundy County, 17% of homes in mapped flood zones carry federal flood insurance, and 0.8% of all homes do.
How much is flood insurance in Aux Sable Township?
FEMA’s Community Rating System list shows no discount for Aux Sable 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 Aux Sable Township?
By FEMA money that reached Aux Sable Township, Severe Winter Storm and Snowstorm (2011): $10K to Aux Sable Township for repairs. By flood claims, Mid-spring storms: 19 paid, $963K.
Is Aux Sable Township at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (78%), and Aux Sable Township’s rate for it is higher than 57% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Aux Sable Township.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Aux Sable 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.