Natural hazards · Mammoth

Mammoth, WY natural hazards

Most of the natural-hazard damage FEMA expects in Mammoth comes from inland flooding, and overall the risk is very high for a U.S. community.

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

Expected damage

How exposed is Mammoth?

Very high

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Mammoth to be higher than in 84% of U.S. communities, mostly from inland flooding and avalanches.

Inland flooding40%Avalanches24%Cold waves10%Earthquakes10%Wildfire7%Everything else10%

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.

Inland flooding

40% of expected damage

Well above average · higher than 91% of U.S. places

Recorded about once a year in the area

Avalanches

24% of expected damage

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

Recorded about once every 8 years in the area

Cold waves

10% of expected damage

Well above average · higher than 76% of U.S. places

Recorded about once every 2 years in the area

Earthquakes

10% of expected damage

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

Wildfire

7% of expected damage

Well above average · higher than 97% of U.S. places

Lower here

TornadoesHailIce stormsWinter weatherHeat wavesLandslidesStrong windLightningDroughtVolcanic activity

Not a risk here

Coastal floodingHurricanesTsunamis

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 homes in flood zones
are insured

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: Park County.

Disasters that hit Mammoth

Federal disasters declared here

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

Brought FEMA money into MammothDeclared for Park County only

Park County has had 2 natural disasters declared since 1953, most often floods.

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.