Natural hazards · Twin Brooks

Twin Brooks, SD natural hazards

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

Moderate

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Twin Brooks to be higher than in 53% of U.S. communities, mostly from cold waves and inland flooding.

Cold waves36%Inland flooding36%Tornadoes9%Hail8%Everything else11%

By hazard

What Twin Brooks faces

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

Cold waves

36% of expected damage

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

Recorded about 14 times a year in the area

Inland flooding

36% of expected damage

Above average · higher than 67% of U.S. places

Recorded about once a year in the area

Tornadoes

9% of expected damage

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

Recorded about once every 3 years in the area

Hail

8% of expected damage

Above average · higher than 67% of U.S. places

Recorded about 4 times a year in the area

Lower here

Ice stormsWinter weatherHeat wavesWildfireEarthquakesLandslidesStrong windLightningDrought

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 Twin Brooks flood?

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

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Grant County.

Disasters that hit Twin Brooks

1 federal disaster brought FEMA money here

Disasters the President declared that paid out in Twin Brooks itself: aid to households, or repair grants to the Town of Twin Brooks.

Brought FEMA money into Twin BrooksDeclared for Grant County only

2019

Severe Winter Storm, Snowstorm, and Flooding

$6K to the Town of Twin Brooks for repairs

Grant County has had 20 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. Twin Brooks 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 Twin Brooks’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Town of Twin Brooks. 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.