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Natural hazards · Merrimac

Merrimac, WI natural hazards

Most of the natural-hazard damage FEMA expects in Merrimac comes from inland flooding, and overall the risk is very high for a U.S. community. 5 federal disasters brought FEMA money into town.

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

How exposed is Merrimac?

80
Very high
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Merrimac to be higher than in 80% of U.S. communities, mostly from inland flooding.

Inland flooding70%Cold waves11%Tornadoes9%Hail5%Everything else5%
By hazard

What Merrimac faces

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

Inland flooding

70% of expected damage
Well above average · higher than 92% of U.S. places
Recorded about 2 times a year in the area

Cold waves

11% of expected damage
Below average · higher than 35% of U.S. places
Recorded about 6 times a year in the area

Tornadoes

9% of expected damage
Well above average · higher than 80% of U.S. places
Recorded about once every 14 years in the area

Hail

5% of expected damage
Well above average · higher than 92% of U.S. places
Recorded about 4 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 Merrimac flood?

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

of homes in flood zones
are insured
of all homes
are insured
No community discount. Merrimac 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 Merrimac

5 federal disasters brought FEMA money here

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

Brought FEMA money into MerrimacDeclared for Sauk County only
2026

Severe Storms, Tornadoes, and Flooding

3 households applied for aid $3K aid approved
2008

Severe Storms, Tornadoes, and Flooding

51 households applied for aid $88K aid approved $3K to the Village of Merrimac for repairs
2007

Severe Storms and Flooding

2 households applied for aid $3K aid approved
2004

Severe Storms and Flooding

1 household applied for aid $1K aid approved
2000

Severe Storms, Tornadoes, and Flooding

$4K to the Village of Merrimac for repairs
Sauk County has had 13 natural disasters declared since 1953, most often severe storms and floods.
Around Merrimac

Merrimac and the towns around it

Merrimac: Very high, mostly inland floodingWest Point: Very high, mostly inland floodingSumpter: Very high, mostly inland floodingGreenfield: Moderate, mostly inland floodingCaledonia: Very high, mostly inland floodingBaraboo: Low, mostly inland floodingPrairie du Sac: High, mostly inland floodingRoxbury: Low, mostly inland floodingLodi: Very high, mostly inland floodingPrairie du Sac: High, mostly inland floodingDane: Very low, mostly inland floodingDekorra: Very high, mostly inland floodingMerrimac: Very high, mostly inland flooding MerrimacMerrimacWest Point
Very lowLowModerateHighVery high
West Pointmostly inland floodingVery high
Merrimacmostly inland floodingVery high
Merrimacmostly inland floodingVery high
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. Merrimac 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 Merrimac’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Village of Merrimac. 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.

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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/18 · 2025-01-01
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