FEMA flood zones · Oklahoma

Harmon County, Oklahoma Flood Zone Map

27 flood insurance claims·$195,378 paid

14% of Harmon 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 Harmon 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.

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 3 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 1987, with 5 claims and $9,711 paid.

1979: 3 claims1983: 2 claims1984: 1 claims1986: 3 claims1987: 5 claims1990: 1 claims1995: 4 claims2004: 1 claims2007: 4 claims2015: 1 claims2016: 2 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.

Federal disasters

20 federal disaster declarations since 1995.

DisasterBegan
Severe Winter StormFeb 8, 2021
Severe Winter StormsFeb 8, 2021
WildfiresApr 11, 2018
Severe Winter Storms And FloodingDec 26, 2015
Severe Storms, Tornadoes, Straight-line Winds, And FloodingMay 5, 2015
Severe Winter StormJan 31, 2011
Severe Winter StormJan 28, 2010
Severe Winter StormDec 24, 2009

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

Recorded flood events

5 since 1996: 4 flash floods and 1 river or area floods.

EventDateDamage
Flash FloodMay 22, 2016—
Flash FloodJun 14, 2015—
Flash FloodSep 11, 2008—
Flash FloodSep 9, 2007—
FloodSep 11, 2003—

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

From the storm reports

Flash Flood · May 22, 2016. Storms formed along a dryline in the panhandles on the 22nd. These storms slowly made their way into western Oklahoma and western north Texas late that evening. The southernmost storms eventually formed into an MCS and followed the Red River overnight into the early morning of the 23rd.

Flash Flood · Jun 14, 2015. With several boundaries floating around the area, storms erupted on the 14th and 15th as an upper level low moved by, producing some flash flooding.

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 9, 2007. September 9th saw yet another day of thunderstorms with very heavy rainfall. Thunderstorms developed over southwest Oklahoma and moved southeast to near the Red River. Flash flooding occurred as slow moving thunderstorms repeatedly affected the same areas. No damage was reported with the 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 Harmon County

If a building in Harmon 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.