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FEMA flood zones · Oklahoma

Dewey County, Oklahoma Flood Zone Map

1 federal flood & hurricane disasters

Less than 1% of Dewey 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 Dewey County, Oklahoma. 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

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

DisasterBegan
Jumping Juniper FireMar 22, 2026
840 Road FireMar 14, 2025
Severe Winter StormFeb 8, 2021
Severe Winter StormsFeb 8, 2021
Severe Winter StormOct 26, 2020
Severe Storms, Straight-line Winds, Tornadoes, And FloodingMay 7, 2019
Rhea Fire ComplexApr 11, 2018
WildfiresApr 11, 2018

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

Recorded flood events

10 since 1996: 8 flash floods and 2 river or area floods.

EventDateDamage
Flash FloodSep 12, 2019—
Flash FloodSep 12, 2008—
Flash FloodSep 11, 2008—
Flash FloodSep 8, 2007—
Flash FloodAug 30, 2004—
FloodJul 1, 2004—
FloodOct 3, 2002—
Flash FloodOct 31, 1998—

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

From the storm reports

Flash Flood · Sep 12, 2019. A slow moving cold front brought numerous storms with severe wind gusts on the 12th.

Flash Flood · Sep 12, 2008. A prolonged area of southwest flow aloft developed over much of Oklahoma during the period from the 10th through the 12th. Numerous upper level disturbances moving through the flow, as well as a very moist air mass allowed for several rounds of showers and thunderstorms to develop and move northeast, much of the time moving over the same areas. Moisture associated with the remnants of Tropical Storm Lowell added t…

Flash Flood · Sep 11, 2008. A prolonged area of southwest flow aloft developed over much of Oklahoma during the period from the 10th through the 12th. Numerous upper level disturbances moving through the flow, as well as a very moist air mass allowed for several rounds of showers and thunderstorms to develop and move northeast, much of the time moving over the same areas. Moisture associated with the remnants of Tropical Storm Lowell added t…

Flash Flood · Sep 8, 2007. An upper level disturbance approached Oklahoma from the Texas panhandle during the afternoon and evening hours of the 7th. A stationary front was located over northwest Oklahoma and extended down into parts of the Texas panhandle. A stationary outflow boundary from previous convection was located near Interstate 44, with yet another smaller outflow boundary located a hundred miles to the south. Afternoon heating a…

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 Dewey County

If a building in Dewey 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.