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FEMA flood zones · Kansas

Hamilton County, Kansas Flood Zone Map

1 federal flood & hurricane disasters

Less than 1% of Hamilton 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 Hamilton 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.

Federal disasters

11 federal disaster declarations since 1965, 1 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Storms, Straight-line Winds, Tornadoes, And FloodingJun 26, 2024
Severe Storms And Straight Line WindsDec 15, 2021
Severe Winter Storm, Snowstorm, Straight-line Winds, And FloodingApr 28, 2017
Severe Storms, Straight-line Winds, Tornadoes, And FloodingJul 22, 2013
Severe Storms, Straight-line Winds, Tornadoes, And FloodingMay 19, 2011
Severe Winter StormsDec 6, 2007
Severe Winter StormDec 28, 2006
Hurricane Katrina EvacuationSep 1, 2005

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

Recorded flood events

8 since 1996: 4 flash floods and 4 river or area floods.

EventDateDamage
Flash FloodJun 1, 2019—
FloodAug 17, 2015—
Flash FloodAug 26, 2014—
FloodMar 1, 2007—
FloodAug 13, 2006—
Flash FloodJun 11, 2003—
Flash FloodJul 15, 2001—

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

From the storm reports

Flash Flood · Jun 1, 2019. An isolated severe thunderstorm produced large hail and subsequently flash flooding.

Flood · Aug 17, 2015. Around midnight there was some flooding across the highway.

Flash Flood · Aug 26, 2014. Thunderstorms producing very heavy rain caused flooding across local roads.

Flood · Mar 1, 2007. A continued problem from February where runoff from snow melt caused extensive flooding across the area.

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 Hamilton County

If a building in Hamilton 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.