FEMA flood zones · Wisconsin

Buffalo County, Wisconsin Flood Zone Map

29 flood insurance claims·$302,613 paid·4 federal flood & hurricane disasters

14% of Buffalo County’s area is in FEMA’s high-risk flood zones.

Share of the whole county outline, rivers and lakes included; parts FEMA hasn’t mapped count as zero.

Coastal high risk (V, VE)FloodwayHigh risk (A, AE)Moderate (X, 500-year)Minimal (X)Undetermined (D)

Shaded areas are FEMA’s mapped flood hazard zones in and around Buffalo County, Wisconsin. Zoomed out they are simplified; at street level the map switches to FEMA’s exact layer. Tap anywhere to check that spot, or search an address above.

How Buffalo County floods

River overflow along the Mississippi and flash flooding from heavy rains characterize the flood risk in Buffalo County, supported by 21 flash flood events and 18 flood events recorded over the last 30 years. Recent historical impacts include an April 2023 event where a rapid snowmelt combined with rain resulted in significant flooding along the Mississippi River, with sites climbing to their third to fifth highest crests on record and prompting a State of Emergency by the Governor of Wisconsin. Additionally, heavy rains from Tropical Depression Cristobal in June 2020 caused flash flooding in Fountain City, where water entered a home as levels reached as high as a door.

Property owners in Zone A should pay the closest attention to these risks, as this zone accounts for the highest claim volume with 24 claims averaging a payout of $10,962 and an average recorded water depth of 12 inches. While fewer claims originated from Zone X_UNSHADED (3 claims averaging $9,994 with an average depth of 34 inches) and Zone X (2 claims averaging $53,400 with an average depth of 3 inches), residents across all zones face documented exposure to both riverine flooding and localized flash events.

Summary written from NOAA storm reports and NFIP claims for this county. Not a prediction.

Where the flood claims came from

11% of Buffalo County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.

27 NFIP claims with a recorded rated flood zone, 1978 to date. The zone is the one FEMA used to rate that policy, which may not match today’s map. Source: OpenFEMA NFIP claims.

How deep the water got

outlet80″ door12″24″36″48″60″72″84″

In flood insurance claims here that reported a flood depth, the average was 17 inches.

Drawn to scale against an 80-inch door. Even a few inches soaks flooring, the bottom of the drywall and anything plugged in near the floor.

Average of the depths reported on claims (zero and implausible values left out); FEMA’s record doesn’t say exactly where each depth was measured. Source: OpenFEMA NFIP claims.

Flood claims, year by year

The worst year was 2001, with 11 claims and $77,748 paid, the year of Flooding, Severe Storms and Tornadoes.

1978: 1 claims1993: 1 claims1996: 1 claims1997: 6 claims2001: 11 claims2002: 1 claims2010: 2 claims2011: 1 claims2015: 1 claims2016: 1 claims2023: 3 claims19801990200020102020

Bar height is scaled by square root so ordinary years stay visible next to the worst one. NFIP claims by year of loss. Source: OpenFEMA.

In their words

26 NOAA storm reports from Buffalo County describe what happened, in the words of the forecasters who covered it. Read the Wisconsin flood stories →

Federal disasters

15 federal disaster declarations since 1965, 4 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Storms, Straight-line Winds, Flooding, Landslides, And MudJul 19, 2017
Severe Storms And FloodingSep 22, 2010
Hurricane Katrina EvacuationAug 29, 2005
Flooding, Severe Storms And TornadoesApr 10, 2001
Severe Storms,straigh Line Winds, Tornadoes,rain,and FloodiJun 18, 1998
Severe Storms, Tornadoes & FloodingJun 7, 1993
Severe Storms & FloodingSep 14, 1992
Severe Storms, Flooding, Hail & TornadoesJul 7, 1978

Weather and water disasters only; most recent first. Source: OpenFEMA Disaster Declarations.

Recorded flood events

39 since 1996: 21 flash floods and 18 river or area floods.

EventDateDamage
FloodApr 20, 2023—
FloodApr 16, 2023—
FloodMay 1, 2023—
Flash FloodJun 9, 2020$10,000
FloodMar 14, 2019—
FloodJun 18, 2018$1,000
Flash FloodJun 18, 2018$2,000
FloodSep 5, 2018$20,000

— = no damage estimate in the record. Source: NOAA Storm Events Database.

From the storm reports

Flood · Apr 20, 2023. A deeper than average snow pack from northern Minnesota into northern Wisconsin underwent a rapid melt through much of April from unseasonably warm temperatures combined with multiple rain events. This resulted in increased water levels and significant flooding for the entire length of the local Mississippi River, with most sites climbing to their third to fifth highest crests on record. A significant mid-April ra…

Flood · Apr 16, 2023. A deeper than average snow pack from northern Minnesota into northern Wisconsin underwent a rapid melt through much of April from unseasonably warm temperatures combined with multiple rain events. This resulted in increased water levels and significant flooding for the entire length of the local Mississippi River, with most sites climbing to their third to fifth highest crests on record. A significant mid-April ra…

Flood · May 1, 2023. The combination of heavy rain and anomalously warm temperatures melting a deeper than average snowpack during April resulted in moderate to major flooding stages being reached at sites along the Upper Mississippi River in Wisconsin. Initial minor flood stage was reached in mid April with near record crests near the end of April. The flooding impacts resulted in a state of emergency being issued by the Governor of…

Flash Flood · Jun 9, 2020. Heavy rains from Tropical Depression Cristobal fell across western Wisconsin on June 9th. This heavy rain resulted in some flash flooding across portions of Buffalo, Trempealeau and Taylor Counties. In Fountain City (Buffalo County), water entered into a home when the levels reached as high as a door. High water covered some city streets in Arcadia (Trempealeau County) and up to a foot of water covered roads in an…

National Weather Service narratives, lightly trimmed. Source: NOAA Storm Events Database.

The zones you’ll see on the map

Every colour on the map above is a place on this drawing: where the ground sits relative to the flood FEMA plans for.

Cross-section of a river floodplainDiagram: a river valley. The floodway is the channel and the land beside it; the 1%-annual-chance flood surface (the base flood elevation) covers the valley floor as zone A or AE; a narrow band higher up is shaded X, the 0.2% floodplain; higher ground is X.0.2% CHANCE A YEAR (500-YEAR)BASE FLOOD ELEVATION · 1% A YEARXAEFloodwayAEX
  1. A / AE Inside the 1%-a-year floodplain: about a 26% chance of flooding over a 30-year mortgage. AE has a mapped base flood elevation; plain A does not.
  2. Floodway The channel and the land beside it that has to be kept clear enough to carry the flood. Building here is tightly limited.
  3. X shaded The 0.2% (500-year) floodplain, plus some levee-protected and very shallow flood areas.
  4. X Outside both lines. No federal requirement to insure, which is not the same as no risk.

Every flood zone code explained →

Flood insurance in Buffalo County

If a building in Buffalo County is in a high-risk zone (A or V) and its mortgage comes from a federally regulated or insured lender, or is federally backed, flood insurance is required.

Outside those zones it is optional, and often worth having: from 2014 to 2024 nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area. Since Risk Rating 2.0, NFIP premiums are set for each building, so the only reliable price is a quote: FloodSmart.gov or a local agent.