FEMA flood zones · Illinois

Cumberland County, Illinois Flood Zone Map

2 flood insurance claims·$12,611 paid·1 federal flood & hurricane disasters

8% of Cumberland 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 Cumberland County, Illinois. 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 Cumberland County floods

Flash flooding from summer thunderstorms dominates the flood risk profile in Cumberland County, Illinois, accounting for 29 out of 38 recorded flood events over the last 30 years alongside 9 general flood events.

Recent history illustrates this pattern. On August 9, 2022, thunderstorms fueled by a slow-moving cold front produced rainfall rates exceeding 2 inches per hour near the I-70 corridor, leading to isolated flash flooding. Earlier, on January 11, 2020, waves of low pressure along a stationary front dropped 3 to 6 inches of rain across a heavy rainfall corridor that included Cumberland County, causing widespread flooding.

NFIP claim records show minimal historical payouts across zones, consisting of a single claim in Zone A with an average payout of $5,726 and an average recorded water depth of 1 inch, and a single claim in Zone X with an average payout of $6,885 and an average recorded water depth of 5 inches. Homeowners and real estate agents should pay the closest attention to properties situated within designated flood hazard zones, particularly Zone A locations where riverine overflow and intense rainfall accumulation present direct flood exposure.

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 3 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.

In their words

16 NOAA storm reports from Cumberland County describe what happened, in the words of the forecasters who covered it. Read the Illinois flood stories →

Federal disasters

9 federal disaster declarations since 1974, 1 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Storms And FloodingJun 29, 2023
Severe Winter Storm And SnowstormJan 31, 2011
Severe Storms And FloodingJun 1, 2008
Hurricane Katrina EvacuationAug 29, 2005
Severe Storms, Tornadoes And FloodingApr 21, 2002
Severe Storms And FloodingApr 28, 1996
Severe Storms & FloodingJun 10, 1974

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

Recorded flood events

38 since 1996: 29 flash floods and 9 river or area floods.

EventDateDamage
Flash FloodAug 9, 2022—
Flash FloodAug 2, 2022—
FloodJan 11, 2020—
Flash FloodMay 29, 2019—
Flash FloodJun 12, 2018—
FloodApr 29, 2017—
Flash FloodApr 29, 2017—
FloodMay 4, 2017—

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

From the storm reports

Flash Flood · Aug 9, 2022. A cluster of thunderstorms developed in the evening near the I-70 corridor ahead of a slow moving cold front. These thunderstorms produced heavy rain and isolated flash flooding across southeast Illinois, with some locations observing rainfall rates that exceeded 2 inches per hour. An additional cluster of thunderstorms moved across the same areas early on the morning of August 9th, producing more flooding.

Flash Flood · Aug 2, 2022. A persistent frontal boundary draped across central Illinois continued to be the focus for strong to severe thunderstorm development during the morning of August 2nd. A low-level jet interacting with the boundary triggered the first cluster of storms across portions of Sangamon and Logan counties during the pre-dawn hours, with additional cells forming from Galesburg to near Lawrenceville as the morning progresse…

Flood · Jan 11, 2020. Several waves of low pressure tracking along a nearly stationary frontal boundary brought periods of locally heavy rainfall to central Illinois on January 10th and 11th. The front gradually shifted eastward into the Ohio River Valley and brought an end to the rain by the evening of January 11th. Storm total rainfall was heaviest in a corridor including Shelby, Moultrie, Douglas, Coles, Cumberland, Effingham, and…

Flash Flood · May 29, 2019. Several clusters of thunderstorms developed along a nearly stationary frontal boundary draped across central Illinois during the late afternoon and evening of May 29th. Four landspout type tornadoes touched down beneath developing cells across portions of Christian and Macon counties. Other storms produced isolated wind damage and hail as large as quarters. In addition, numerous cells training over the same loc…

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 Cumberland County

If a building in Cumberland 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.