FEMA flood zones · Missouri

Sullivan County, Missouri Flood Zone Map

2 flood insurance claims·$329 paid·1 federal flood & hurricane disasters

11% of Sullivan County’s area is in FEMA’s high-risk flood zones, and another 1% in shaded X (mostly the 0.2% floodplain and areas behind levees).

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 Sullivan County, Missouri. 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 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 1 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

1 NOAA storm reports from Sullivan County describe what happened, in the words of the forecasters who covered it. Read the Missouri flood stories →

Federal disasters

24 federal disaster declarations since 1973, 1 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Storms, Tornadoes, And FloodingApr 29, 2019
Severe Storms, Tornadoes, Straight-line Winds, And FloodingMay 15, 2015
Severe Storms, Tornadoes, Straight-line Winds, And FloodingSep 9, 2014
Severe Storms, Straight-line Winds, Tornadoes, And FloodingMay 29, 2013
Severe Winter StormJan 31, 2011
Severe Winter Storm And SnowstormJan 31, 2011
Severe Storms, Flooding, And TornadoesJun 12, 2010
Severe Storms, Tornadoes, And FloodingMay 8, 2009

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

Recorded flood events

13 since 1996: 10 flash floods and 3 river or area floods.

EventDateDamage
FloodJun 9, 2020—
FloodSep 29, 2019—
FloodApr 5, 2017—
Flash FloodMay 15, 2009—
Flash FloodJul 24, 2008—
Flash FloodSep 13, 2008$1,000
Flash FloodAug 28, 2004—
Flash FloodAug 27, 2004$100,000

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

From the storm reports

Flood · Jun 9, 2020. A brief tornado formed near I-29 close to the town of Oregon, Missouri. This tornado was filmed, so while video evidence exists, there was no reported damage from this brief tornado. Ongoing moderate to heavy rain caused some roads to be closed in central Missouri through most of the day.

Flood · Sep 29, 2019. Several areas had flash flooding after 3 to 5 inches of rain fell across the area. The worst of the flooding came from Harrisonville, where several business were inundated under several feet of water.

Flood · Apr 5, 2017. Widespread moderate to heavy rain resulted in numerous roads across northern Missouri to be flooded. Impacts were rather low, as most of these closures were soon resolved once the water receded.

Flash Flood · May 15, 2009. Thunderstorms produced heavy rains across portions of northwest Missouri on may 15, 2009. Numerous flash flood warnings were needed. There were also reports of large hail. Rainfall amounts were as high as 10 inches in spots. This caused several area rivers to go into flood.

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 Sullivan County

If a building in Sullivan 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.