Natural hazards · Dellona

Dellona, WI natural hazards

Most of the natural-hazard damage FEMA expects in Dellona comes from inland flooding, and overall the risk is high for a U.S. community. Flood insurance has paid 40 claims here since 1992. 1 federal disaster brought FEMA money into town.

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

Expected damage

How exposed is Dellona?

High

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Dellona to be higher than in 68% of U.S. communities, mostly from inland flooding.

Inland flooding63%Cold waves15%Tornadoes10%Hail6%Everything else6%

By hazard

What Dellona faces

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

Inland flooding

63% of expected damage

Well above average · higher than 84% of U.S. places

Recorded about 2 times a year in the area

Cold waves

15% of expected damage

Below average · higher than 35% of U.S. places

Recorded about 6 times a year in the area

Tornadoes

10% of expected damage

Well above average · higher than 75% of U.S. places

Recorded about once every 16 years in the area

Hail

6% of expected damage

Well above average · higher than 92% of U.S. places

Recorded about 3 times a year in the area

Lower here

HurricanesIce stormsWinter weatherHeat wavesWildfireEarthquakesLandslidesStrong 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 Dellona flood?

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

40paid claims since 1992

$2.3Mpaid to owners

0homes flooded more than once

19922026

Biggest named events

Storm: 18 claims, $1.1M

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Sauk County.

Disasters that hit Dellona

1 federal disaster brought FEMA money here

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

Brought FEMA money into DellonaDeclared for Sauk County only

2008

Severe Storms, Tornadoes, and Flooding

$16K to the Town of Dellona for repairs

Sauk County has had 13 natural disasters declared since 1953, most often severe storms and floods.

Around Dellona

Dellona and the towns around it

Very lowLowModerateHighVery high

Dellonamostly inland floodingHigh

Excelsiormostly inland floodingHigh

Winfieldmostly inland floodingHigh

Lyndonmostly inland floodingModerate

Deltonmostly 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. Dellona covers 1 census tract, combined by population.

Money that reached townFlood claims are matched to Dellona’s own flood-insurance community (here, the census tracts inside it); household aid to the registrant’s city; repair grants to the Town of Dellona. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

FEMA’s expected losses across Dellona total about $3.2M a year, counting buildings, people and crops.

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.