Natural hazards · Lyon

Lyon, SD natural hazards

Most of the natural-hazard damage FEMA expects in Lyon comes from cold waves, and overall the risk is 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 Lyon?

High

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Lyon to be higher than in 65% of U.S. communities, mostly from cold waves and inland flooding.

Cold waves60%Inland flooding22%Drought6%Everything else13%

By hazard

What Lyon faces

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

Cold waves

60% of expected damage

Above average · higher than 63% of U.S. places

Recorded about 6 times a year in the area

Inland flooding

22% of expected damage

Well above average · higher than 78% of U.S. places

Recorded about once a year in the area

Drought

6% of expected damage

Recorded about 26 times a year in the area

Lower here

TornadoesHailIce stormsWinter weatherHeat wavesWildfireEarthquakesLandslidesStrong 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 Lyon flood?

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

Disasters that hit Lyon

1 federal disaster brought FEMA money here

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

Brought FEMA money into LyonDeclared for Brule County only

2008

Severe Storms and Flooding

$3K to the Township of Lyon for repairs

Brule County has had 17 natural disasters declared since 1953, most often severe storms and floods.

Around Lyon

Lyon and the towns around it

Very lowLowModerateHighVery high

Lyonmostly cold wavesHigh

Plummermostly cold wavesHigh

Unionmostly cold wavesHigh

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