Natural hazards · Mammoth

Mammoth, MT natural hazards

Most of the natural-hazard damage FEMA expects in Mammoth comes from avalanches, 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 Mammoth?

High

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Mammoth to be higher than in 74% of U.S. communities, mostly from avalanches and inland flooding.

Avalanches67%Inland flooding20%Earthquakes6%Everything else8%

By hazard

What Mammoth faces

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

Avalanches

67% of expected damage

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

Recorded about once every 3 years in the area

Inland flooding

20% of expected damage

Well above average · higher than 83% of U.S. places

Recorded about once every 3 years in the area

Earthquakes

6% of expected damage

Well above average · higher than 83% of U.S. places

Lower here

TornadoesHailIce stormsWinter weatherCold wavesHeat wavesWildfireLandslidesStrong windLightningDrought

Not a risk here

Coastal floodingHurricanesTsunamisVolcanic 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 Mammoth flood?

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

of all homes
are insured

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

Insurance rates: Madison County.

Disasters that hit Mammoth

Federal disasters declared here

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

Brought FEMA money into MammothDeclared for Madison County only

Madison County has had 5 natural disasters declared since 1953, most often severe storms and fires.

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