FEMA flood zones · Wisconsin

Green Lake County, Wisconsin Flood Zone Map

53 flood insurance claims·$440,717 paid·2 federal flood & hurricane disasters

19% of Green Lake 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 Green Lake 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.

Where the flood claims came from

21% of Green Lake County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.

39 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 4 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 2008, with 19 claims and $169,043 paid, the year of Severe Storms, Tornadoes, and Flooding.

1979: 2 claims1993: 4 claims2001: 1 claims2004: 12 claims2008: 19 claims2010: 1 claims2011: 1 claims2012: 6 claims2018: 6 claims2019: 1 claims1980199020002010

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

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

Federal disasters

9 federal disaster declarations since 1973, 2 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Storms, Tornadoes, Straight-line Winds, Flooding, And LandslidesAug 17, 2018
Severe Storms, Tornadoes, And FloodingJun 5, 2008
Hurricane Katrina EvacuationAug 29, 2005
Severe Storms And FloodingMay 7, 2004
Severe Storms, Tornadoes & FloodingJun 7, 1993
DroughtJun 17, 1976
Severe Storms & FloodingApr 27, 1973

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

Recorded flood events

14 since 1996: 3 flash floods and 11 river or area floods.

EventDateDamage
FloodMar 18, 2019$1,000
FloodMar 14, 2019$5,000
FloodApr 1, 2019$5,000
FloodSep 5, 2018$1,000
FloodSep 1, 2018$5,000
FloodOct 1, 2018$1,000
Flash FloodJun 7, 2008—
FloodMay 25, 2004$300,000

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

From the storm reports

Flood · Mar 18, 2019. A warm spell along with some rainfall led to the melting of 8-12 inches of snow on a frozen ground. Runoff led to long term river flooding on the Fox River of central WI.

Flood · Mar 14, 2019. Mild temperatures and some rainfall led to snow melt and excessive runoff on a frozen ground. Numerous rivers flooded including flooding in atypical areas due to ice jams. Evacuations were needed in some communities. The American Red Cross did respond in some cases to aid the flood victims.

Flood · Apr 1, 2019. Flooding from March continued into April although most rivers were declining during April.

Flood · Sep 5, 2018. River flooding was prevalent across southern WI during the month of September after receiving 12 to 20 inches of rain from August 16th to September 5th. Additional rains throughout the remainder of the month prolonged the flooding. Moderate to major flood stage was reached on the Baraboo and Fox Rivers of central WI, and the Rock River in Jefferson and Rock Counties. Flooding continued into early September on sect…

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 Green Lake County

If a building in Green Lake 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.