Natural hazards · Big Rock

Big Rock, IA natural hazards

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

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

Expected damage

How exposed is Big Rock?

Moderate

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Big Rock to be higher than in 46% of U.S. communities, mostly from inland flooding and drought.

Inland flooding59%Drought19%Tornadoes5%Hail5%Everything else12%

By hazard

What Big Rock faces

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

Inland flooding

59% of expected damage

Above average · higher than 66% of U.S. places

Recorded about 3 times a year in the area

Drought

19% of expected damage

Recorded about 9 times a year in the area

Tornadoes

5% of expected damage

Above average · higher than 56% of U.S. places

Recorded about once every 8 years in the area

Hail

5% of expected damage

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

Recorded about 4 times a year in the area

Lower here

HurricanesIce stormsWinter weatherCold wavesHeat wavesWildfireEarthquakesLandslidesStrong windLightning

Not a risk here

Coastal floodingAvalanchesTsunamisVolcanic 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 Big Rock flood?

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

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Scott County.

Disasters that hit Big Rock

Federal disasters declared here

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

Brought FEMA money into Big RockDeclared for Scott County only

Scott County has had 17 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. Big Rock 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 Big Rock’s own flood-insurance community; household aid to the registrant’s city; repair grants to Big Rock. 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.