Natural hazards · Merton

Merton, SD natural hazards

Most of the natural-hazard damage FEMA expects in Merton comes from cold waves, and overall the risk is low for a U.S. community.

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

Expected damage

How exposed is Merton?

Low

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Merton to be higher than in 39% of U.S. communities, mostly from cold waves and inland flooding.

Cold waves42%Inland flooding26%Hail11%Tornadoes10%Everything else11%

By hazard

What Merton faces

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

Cold waves

42% of expected damage

Above average · higher than 69% of U.S. places

Recorded about 12 times a year in the area

Inland flooding

26% of expected damage

Below average · higher than 49% of U.S. places

Recorded about once a year in the area

Hail

11% of expected damage

Well above average · higher than 75% of U.S. places

Recorded about 4 times a year in the area

Tornadoes

10% of expected damage

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

Recorded about once every 2 years in the area

Lower here

Ice stormsWinter weatherHeat wavesWildfireEarthquakesLandslidesStrong windLightning

Not a risk here

Coastal floodingHurricanesDroughtAvalanchesTsunamisVolcanic 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 Merton flood?

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

of all homes
are insured

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

Insurance rates: Clark County.

Disasters that hit Merton

Federal disasters declared here

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

Brought FEMA money into MertonDeclared for Clark County only

Clark County has had 20 natural disasters declared since 1953, most often floods and severe storms.

Around Merton

Merton and the towns around it

Very lowLowModerateHighVery high

Mertonmostly cold wavesLow

Foxtonmostly cold wavesLow

Daymostly cold wavesLow

Lakemostly cold wavesLow

Darlingtonmostly cold wavesLow

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