FEMA flood zones · Kansas

Atchison County, Kansas Flood Zone Map

3 flood insurance claims·$31,391 paid·5 federal flood & hurricane disasters

13% of Atchison 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 Atchison County, Kansas. 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 Atchison County floods

Riverine flooding from long-duration high-water events dominates the flood profile of Atchison County, KS, supported by 44 recorded flood events compared to 18 flash flood events over the last 30 years.

Significant historical impacts include major flooding along the Missouri River in March 2019, driven by melting snowpack and heavy rain with impacts aggravated by levee failures. Consistent heavy rains caused this Missouri River flooding to continue through June 2019, keeping some locations in major flood for several weeks.

National Flood Insurance Program records show claims concentrated in specific zones, with Zone A recording 2 claims averaging a $15,696 payout and an average recorded water depth of 2 inches, alongside 1 claim in Zone X_UNSHADED with a $0 payout and an average recorded water depth of 0 inches. Properties near rivers and levees should pay the most attention to flood risk in this county.

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 2001, with 1 claims and $16,000 paid.

1982: 1 claims2001: 1 claims2011: 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

7 NOAA storm reports from Atchison County describe what happened, in the words of the forecasters who covered it. Read the Kansas flood stories →

Federal disasters

19 federal disaster declarations since 1967, 5 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Storms, Straight-line Winds, Tornadoes, Flooding,landslides,and MudslidesApr 28, 2019
Severe Storms, Tornadoes, Straight-line Winds, And FloodingMay 4, 2015
FloodingJun 1, 2011
Severe Storms, Flooding, And TornadoesJun 7, 2010
Severe Winter Storms And SnowstormDec 22, 2009
Severe Winter StormsDec 6, 2007
Severe Storms And FloodingOct 1, 2005
Hurricane Katrina EvacuationSep 1, 2005

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

Recorded flood events

62 since 1996: 18 flash floods and 44 river or area floods.

EventDateDamage
FloodApr 30, 2019—
Flash FloodMay 28, 2019—
FloodMar 13, 2019$100,000
FloodMay 1, 2019—
FloodJun 1, 2019—
FloodApr 1, 2019—
Flash FloodJun 30, 2018—
FloodJun 30, 2017—

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

From the storm reports

Flood · Apr 30, 2019. After a relatively wet month, another round of thunderstorms moved into the region, causing some flooding on area roads.

Flash Flood · May 28, 2019. In the evening of May 28 a strong tornado formed in Douglas County and grew to a wide EF-4 tornado. This is the same storm that caused the storm chasing group to fly off the road just south of Lawrence, Kansas. Once the tornado crossed into Leavenworth County it impacted mainly rural residences, but also impact the city of Linwood. It was here that isolated EF-3 and EF-4 damage was noted. The tornado continued on…

Flood · Mar 13, 2019. Several months of heavy snow across the Northern Plains set the stage for a significant and catastrophic flooding event when temperatures warmed and heavy rain fell across Nebraska and the Dakotas. While the more significant damage occurred across eastern Nebraska several counties along the Missouri River in parts of northeast Kansas saw some high impacts as well. Numerous locations along the Missouri River receiv…

Flood · May 1, 2019. Heavy late winter and spring precipitation, mixed with a loaded snow pack caused the Missouri River to flood in March. Consistent heavy rains continued the Missouri River flooding into and through May. Some locations along the Missouri River were in major flood for several weeks as heavy rains continued.

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 Atchison County

If a building in Atchison 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.