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FEMA flood zones · Nebraska

Grant County, Nebraska Flood Zone Map

1 federal flood & hurricane disasters

Less than 1% of Grant 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 Grant County, Nebraska. 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

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

Federal disasters

5 federal disaster declarations since 2005, 1 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Storms And Straight-line WindsJul 9, 2021
Severe Winter Storm, Straight-line Winds, And FloodingMar 9, 2019
Hurricane Katrina EvacueesAug 29, 2005

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

Recorded flood events

2 since 1996: 2 flash floods.

EventDateDamage
Flash FloodAug 4, 2011$10,000
Flash FloodAug 26, 2002$25,000

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

From the storm reports

Flash Flood · Aug 4, 2011. A line of thunderstorms developed from the southern Nebraska panhandle into central Nebraska on the afternoon of August 4th and remained fairly stationary before evolving into a north to south oriented line of storms and progressing into eastern Nebraska. Heavy rains were produced from these thunderstorms, with amounts exceeding 3.00 inches in portions of Arthur and McPherson counties. These heavy rains caused fl…

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 Grant County

If a building in Grant 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.