FEMA flood zones · Oklahoma

Custer County, Oklahoma Flood Zone Map

19 flood insurance claims·$184,084 paid·3 federal flood & hurricane disasters

10% of Custer 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 Custer 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 Custer County floods

Flash flooding from severe summer thunderstorms dominates the flood profile of Custer County, accounting for the vast majority of historical flood events over the last 30 years compared to standard riverine floods. NOAA storm records document multiple instances of this hazard, including a mesoscale convective system that produced urban flash flooding on June 23, 2023, and slow-moving storms along a stationary boundary that caused heavy rainfall and flooding between May 31 and June 1, 2022.

National Flood Insurance Program records show claims filed across multiple zones, indicating that flood risk extends beyond designated high-risk areas. Properties located in FEMA Zone A recorded 7 claims with an average payout of $18,303 and an average recorded water depth of 3 inches. Meanwhile, properties in Zone X recorded 6 claims with an average payout of $15,728 and an average recorded water depth of 1 inch, and Zone X_UNSHADED recorded 5 claims with an average payout of $2,728 and an average water depth of 1 inch. Zone X_SHADED recorded 1 claim with an average payout of $292 and an average water depth of 0 inches.

Homeowners, real estate agents, and journalists should pay the closest attention to properties located within FEMA Zone A, as well as lower-lying parcels in Zone X that have historically experienced property damage and insurance payouts from localized flash flooding.

Summary written from NOAA storm reports and NFIP claims for this county. Not a prediction.

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 2 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 2019, with 4 claims and $52,005 paid, the year of Severe Storms, Straight-line Winds, Tornadoes, and Flooding.

1982: 3 claims1983: 1 claims1986: 1 claims1987: 1 claims1988: 1 claims2000: 1 claims2007: 1 claims2008: 2 claims2013: 2 claims2018: 2 claims2019: 4 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.

In their words

7 NOAA storm reports from Custer County describe what happened, in the words of the forecasters who covered it. Read the Oklahoma flood stories →

Federal disasters

32 federal disaster declarations since 1982, 3 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Storms, Straight-line Winds, Tornadoes, And FloodingMay 19, 2024
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
WildfiresApr 11, 2018
Severe Winter Storms And FloodingDec 26, 2015
Severe Winter Storms And FloodingNov 27, 2015

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

Recorded flood events

22 since 1996: 19 flash floods and 3 river or area floods.

EventDateDamage
Flash FloodJun 23, 2023$5,000
Flash FloodJul 9, 2023—
FloodJun 8, 2022—
Flash FloodJun 8, 2022—
Flash FloodJun 1, 2022—
Flash FloodMay 25, 2019$10,000
Flash FloodMay 7, 2019—
Flash FloodJul 3, 2019—

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

From the storm reports

Flash Flood · Jun 23, 2023. Convection during the early morning hours of the 23rd, centered across the Texas Panhandle, organized into a small mesoscale convective system (MCS) as it entered into portions of western Oklahoma by the mid-morning time frame. Severe wind gusts, a report of large hail and urban flash flooding were noted from western into central Oklahoma through the early afternoon hours.

Flash Flood · Jul 9, 2023. An impactful severe weather event occurred across portions of western into central Oklahoma during the early morning hours of the 9th. Initially, a broken line of strong to severe thunderstorms entered northwestern Oklahoma and slowly organized into a quasi-linear convective system (QLCS). Additional organized/severe storms developed across central Oklahoma owing to an increasing low-level jet/isentropic ascent. S…

Flood · Jun 8, 2022. A complex of storms moved into western Oklahoma from the Texas panhandle during the early morning hours of the 8th, with reports of large hail and severe wind gusts received.

Flash Flood · Jun 8, 2022. A complex of storms moved into western Oklahoma from the Texas panhandle during the early morning hours of the 8th, with reports of large hail and severe wind gusts received.

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 Custer County

If a building in Custer 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.