Natural hazards · Clarkson Valley

Clarkson Valley, MO natural hazards

Most of the natural-hazard damage FEMA expects in Clarkson Valley comes from inland flooding, and overall the risk is moderate for a U.S. community. Flood insurance has paid 1 claim here since 1993.

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

Expected damage

How exposed is Clarkson Valley?

Moderate

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Clarkson Valley to be higher than in 57% of U.S. communities, mostly from inland flooding and heat waves.

Inland flooding43%Heat waves29%Earthquakes11%Hail6%Everything else10%

By hazard

What Clarkson Valley faces

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

Inland flooding

43% of expected damage

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

Recorded about 3 times a year in the area

Heat waves

29% of expected damage

Above average · higher than 64% of U.S. places

Recorded about 15 times a year in the area

Earthquakes

11% of expected damage

Well above average · higher than 80% of U.S. places

Hail

6% of expected damage

Well above average · higher than 93% of U.S. places

Recorded about 5 times a year in the area

Lower here

HurricanesTornadoesIce stormsWinter weatherCold wavesWildfireLandslidesStrong windLightningDrought

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 Clarkson Valley flood?

Every paid claim on a federal flood insurance policy in Clarkson Valley, from FEMA’s records.

1paid claims since 1993

$11Kpaid to owners

0homes flooded more than once

19932026

Biggest named events

Midwest Flooding: 1 claim, $11K

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: St. Louis County.

Disasters that hit Clarkson Valley

Federal disasters declared here

None of the disasters declared for St. Louis County shows FEMA aid or repair money reaching Clarkson Valley itself in FEMA’s records.

Brought FEMA money into Clarkson ValleyDeclared for St. Louis County only

St. Louis County has had 29 natural disasters declared since 1953, most often severe storms and floods.

Around Clarkson Valley

Clarkson Valley and the towns around it

Very lowLowModerateHighVery high

Clarkson Valleymostly inland floodingModerate

Ballwinmostly heat wavesModerate

Wildwoodmostly inland floodingModerate

Ellisvillemostly heat wavesModerate

Chesterfieldmostly inland floodingModerate

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. Clarkson Valley 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 Clarkson Valley’s own flood-insurance community; household aid to the registrant’s city; repair grants to the City of Clarkson Valley. 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.