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FEMA flood zones · Kansas

Trego County, Kansas Flood Zone Map

1 federal flood & hurricane disasters

Less than 1% of Trego 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 Trego 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.

In their words

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

Federal disasters

13 federal disaster declarations since 1993, 1 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Winter StormJan 8, 2024
Severe Winter Storms And Straight-line WindsMar 17, 2022
Severe Storms And Straight Line WindsDec 15, 2021
Severe Winter StormJan 13, 2017
Severe Storms, Flooding And TornadoesMay 22, 2008
Severe Winter StormsDec 6, 2007
Severe Winter StormDec 28, 2006
Severe Winter StormNov 27, 2005

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

Recorded flood events

13 since 1996: 8 flash floods and 5 river or area floods.

EventDateDamage
Flash FloodAug 28, 2025—
Flash FloodSep 16, 2024—
FloodMay 29, 2018—
FloodSep 8, 2009—
FloodJul 1, 2004—
Flash FloodSep 13, 2001—
Flash FloodJun 23, 2000—
FloodJul 20, 2000—

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

From the storm reports

Flash Flood · Aug 28, 2025. An upper-level trough was positioned in northern Kansas with a 700 mb temperature gradient stretching into SW Kansas with a wedge of high moisture. On the afternoon of the 27th, supercells initiated and produced severe hail and winds. Into the evening, it became a more multicellular regime with widespread heavy rainfall. This produced flash flooding in multiple counties.

Flash Flood · Sep 16, 2024. As a shortwave trough moved into Kansas, thunderstorms developed along the dryline over western Kansas. These were training cells in two clusters. The northern storms dropped large hail (2.25 IN) and large quantities of rain in Trego county. The southern storm generated strong winds (63 MPH) in Gray county and thunderstorm wind damage in Finney county.

Flood · May 29, 2018. A residual outflow boundary and a warm front interacted with an unstable atmosphere to produce severe thunderstorms.

Flood · Sep 8, 2009. Runoff from heavy rain that fell on the 7th and 8th produced some minor flooding.

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 Trego County

If a building in Trego 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.