Natural hazards · Allen

Allen, SD natural hazards

Most of the natural-hazard damage FEMA expects in Allen comes from wildfires, and overall the risk is very high for a U.S. community. 1 federal disaster brought FEMA money into town.

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

Expected damage

How exposed is Allen?

Very high

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Allen to be higher than in 83% of U.S. communities, mostly from wildfires and cold waves.

Wildfire33%Cold waves19%Inland flooding19%Drought8%Hail5%Everything else15%

By hazard

What Allen faces

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

Wildfire

33% of expected damage

Well above average · among the top 1% of U.S. places

Cold waves

19% of expected damage

Above average · higher than 61% of U.S. places

Recorded about 5 times a year in the area

Inland flooding

19% of expected damage

Above average · higher than 56% of U.S. places

Recorded about once every 2 years in the area

Drought

8% of expected damage

Recorded about 48 times a year in the area

Hail

5% of expected damage

Well above average · higher than 90% of U.S. places

Recorded about 4 times a year in the area

Lower here

TornadoesIce stormsWinter weatherHeat wavesEarthquakesLandslidesStrong windLightning

Not a risk here

Coastal floodingHurricanesAvalanchesTsunamisVolcanic 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 Allen flood?

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

Disasters that hit Allen

1 federal disaster brought FEMA money here

Disasters the President declared that paid out in Allen itself: aid to households, or repair grants to Allen.

Brought FEMA money into AllenDeclared for Bennett County only

2019

Severe Winter Storm, Snowstorm, and Flooding

28 households applied for aid $7K aid approved

Bennett County has had 12 natural disasters declared since 1953, most often floods and severe storms.

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. Allen 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 Allen’s own flood-insurance community; household aid to the registrant’s city; repair grants to Allen. 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.