Natural hazards · Allison

Allison, IL natural hazards

Most of the natural-hazard damage FEMA expects in Allison comes from inland flooding, and overall the risk is high for a U.S. community.

FEMA National Risk Index, December 2025 · OpenFEMA claims, aid & declarations

Expected damage

How exposed is Allison?

High

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Allison to be higher than in 77% of U.S. communities, mostly from inland flooding and drought.

Inland flooding54%Drought18%Earthquakes11%Tornadoes6%Everything else12%

By hazard

What Allison faces

Each hazard’s share of the damage FEMA expects here, and how that compares with the rest of the country.

Inland flooding

54% of expected damage

Well above average · higher than 87% of U.S. places

Recorded about once a year in the area

Drought

18% of expected damage

Recorded about 4 times a year in the area

Earthquakes

11% of expected damage

Well above average · higher than 82% of U.S. places

Tornadoes

6% of expected damage

Well above average · higher than 77% of U.S. places

Recorded about once every 8 years in the area

Lower here

HurricanesHailIce stormsWinter weatherCold wavesHeat wavesWildfireLandslidesStrong windLightning

Not a risk here

Coastal floodingAvalanchesTsunamisVolcanic activity

Flood risk changes street by street. Check a specific address on FEMA’s flood map, and ask about flood insurance before you buy.

Flood insurance claims

Does Allison flood?

FEMA's records show no paid flood insurance claims in Allison.

of homes in flood zones
are insured

of all homes
are insured

No community discount. Allison isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.

Insurance rates: Lawrence County.

Disasters that hit Allison

Federal disasters declared here

None of the disasters declared for Lawrence County shows FEMA aid or repair money reaching Allison itself in FEMA’s records.

Brought FEMA money into AllisonDeclared for Lawrence County only

Lawrence County has had 7 natural disasters declared since 1953, most often severe storms and floods.

Around Allison

Allison and the towns around it

Very lowLowModerateHighVery high

Lawrencemostly inland floodingVery high

Denisonmostly inland floodingHigh

Allisonmostly inland floodingHigh

Russellmostly inland floodingHigh

Washingtonmostly inland floodingModerate

Vincennesmostly earthquakesModerate

About these numbers

How to read this page

An average, not a forecastFEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.

Compared by rate“Higher than N%” compares yearly damage as a share of what’s here, so a big city isn’t rated riskier just for having more buildings. Allison is smaller than a census tract, so it shares the figures of the tract around its center.

Money that reached townFlood claims are matched to Allison’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Township of Allison. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

Sources: FEMA National Risk Index (December 2025); 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. Census tracts: U.S. Census Bureau.