FEMA flood zones · Wisconsin

Adams County, Wisconsin Flood Zone Map

32 flood insurance claims·$89,665 paid·3 federal flood & hurricane disasters

10% of Adams 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 Adams 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 Adams County floods

River flooding and flash flooding from summer thunderstorms dominate Adams County, supported by NOAA records showing 14 flood events and 7 flash flood events over the last 30 years. Heavy rainfall during June and July led to events such as the Lemonwier River at New Lisbon rising into flood stage during the first two weeks of July 2024. Additionally, a slow-moving cluster of thunderstorms on August 1, 2024, brought heavy rainfall across Adams County that resulted in localized roadway flooding.

National Flood Insurance Program records indicate historical claims across multiple zones. Properties in Zone X recorded 21 claims with an average payout of $2,844 and an average recorded water depth of 1 inch. Properties in Zone A recorded 10 claims with an average payout of $8,687 and an average recorded water depth of 3 inches. One claim was recorded in Zone UNKNOWN, with an average payout of $572 and an average recorded water depth of 1 inch.

Homeowners, real estate agents, and journalists should pay the most attention to properties near rivers and those situated in designated flood zones, as both Zone A and Zone X have experienced documented claims and water accumulations.

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

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 2 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 2020, with 9 claims and $18,327 paid.

1986: 1 claims1993: 5 claims2002: 1 claims2010: 2 claims2011: 1 claims2013: 1 claims2014: 1 claims2016: 2 claims2017: 1 claims2019: 5 claims2020: 9 claims2021: 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

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

Federal disasters

12 federal disaster declarations since 1976, 3 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Storms, Tornadoes, Straight-line Winds, Flooding, And LandslidesAug 17, 2018
Severe Storms, Flooding, And MudslidesSep 21, 2016
Severe Storms, Tornadoes, And FloodingJun 5, 2008
Hurricane Katrina EvacuationAug 29, 2005
Severe Storms And FloodingMay 7, 2004
Severe Storms And FloodingJun 21, 2002
Flooding, Severe Storms And TornadoesApr 10, 2001
Severe Storms, Tornadoes, And FloodingMay 26, 2000

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

Recorded flood events

21 since 1996: 7 flash floods and 14 river or area floods.

EventDateDamage
FloodJul 15, 2024—
FloodJul 3, 2024—
Flash FloodAug 1, 2024—
FloodJun 24, 2021—
FloodAug 28, 2020$4,000
Flash FloodAug 28, 2020$5,000
FloodApr 18, 2019—
FloodMar 14, 2019$750,000

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

From the storm reports

Flood · Jul 15, 2024. Rounds of thunderstorms during the middle of July led to increased runoff across portions of western Wisconsin. As a result, several river basins rose into flood stage with the passage of these storms. Most notably, the Kickapoo River at Ontario entered major flood stage with a river stage of just under 20 feet.

Flood · Jul 3, 2024. Above normal rainfall throughout June in addition to locally heavy rainfall at the start of July allowed the Grant River at Burton and Lemonwier River at New Lisbon to rise into flood stage during the first two weeks of July.

Flash Flood · Aug 1, 2024. During the afternoon and evening hours on August 1st, a slow moving cluster of thunderstorms brought heavy rainfall across Adams County. This resulted in localized roadway flooding.

Flood · Jun 24, 2021. An area of storms moved across portions of western Wisconsin during the late afternoon and evening of June 24th. These storms produced some minor roof damage to a barn southeast of Riplinger (Clark County). A few trees were blown down near West Salem (La Crosse County). Some of these storms also dropped hail and the largest reported hail was half dollar sized near Willard (Clark County).

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 Adams County

If a building in Adams 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.