FEMA flood zones · Ohio

Allen County, Ohio Flood Zone Map

259 flood insurance claims·$4.1M paid

6% of Allen 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 Allen County, Ohio. 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

5% of Allen County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.

110 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 7 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 2015, with 47 claims and $1.2M paid.

1978: 3 claims1979: 10 claims1980: 2 claims1981: 26 claims1982: 4 claims1984: 1 claims1986: 4 claims1988: 1 claims1989: 1 claims1990: 2 claims1992: 9 claims1997: 10 claims2003: 1 claims2004: 2 claims2005: 3 claims2006: 1 claims2007: 25 claims2008: 10 claims2009: 7 claims2011: 33 claims2013: 5 claims2014: 1 claims2015: 47 claims2016: 3 claims2017: 11 claims2018: 3 claims2019: 27 claims2020: 2 claims2021: 1 claims2022: 2 claims2023: 2 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

3 NOAA storm reports from Allen County describe what happened, in the words of the forecasters who covered it. Read the Ohio flood stories →

Federal disasters

10 federal disaster declarations since 1965.

DisasterBegan
Severe StormsJun 29, 2012
Severe Storms And Straight-line WindsJun 29, 2012
Severe Storms, Flooding, And TornadoesAug 20, 2007
Hurricane Katrina EvacuationAug 29, 2005
Severe Winter Storms, Flooding, And MudslidesDec 22, 2004
Severe Storms And FloodingAug 27, 2004
Blizzards & SnowstormsJan 26, 1978
Tornadoes & Severe StormsApr 14, 1965

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

Recorded flood events

13 since 1996: 9 flash floods and 4 river or area floods.

EventDateDamage
Flash FloodJul 9, 2020—
FloodApr 26, 2019—
FloodJun 16, 2015—
Flash FloodMay 28, 2014$100,000
Flash FloodMay 14, 2011—
Flash FloodMay 11, 2011—
Flash FloodAug 22, 2007$500,000
Flash FloodSep 3, 2004—

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

From the storm reports

Flash Flood · Jul 9, 2020. Storms similar to previous day storms due to weak shear and strong instability. A few strong to severe storms over northwest Ohio with damaging wind gusts in the form of downbursts as well as torrential rainfall.

Flood · Apr 26, 2019. During the early morning hours of the 26th a large mesoscale complex moved from Indiana into western Ohio. Rainfall reports ranged from 2.5 to 3.5 inches, most of which fell over a 4 hour timeframe.

Flood · Jun 16, 2015. The edge of strong high pressure was situated over northwestern Ohio as a series of disturbances moved into the region. In addition, the remnants of a tropical system added to already abundant moisture to set the stage for isolated severe storms and several rounds of torrential rainfall for parts of northwestern Ohio. Rainfall rates of two to three inches per hour were common with the stronger cells, allowing 5 da…

Flash Flood · May 28, 2014. A weak trough was located across northwestern Ohio during the afternoon and evening hours. A moist, but marginally unstable atmosphere allowed for thunderstorms to develop and remain relatively stationary over the same areas. Local rainfall amounts of 2 to as much as over 6 inches fell across mainly Allen County, resulting in flash flooding. The flash flooding resulted in a small portion of Interstate 75 being clo…

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 Allen County

If a building in Allen 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.