FEMA flood zones · South Dakota

Jones County, South Dakota Flood Zone Map

5 federal flood & hurricane disasters

Less than 1% of Jones 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 Jones County, South Dakota. 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 Jones County floods

River and standard flooding events dominate the historical flood record in Jones County, accounting for 24 out of 26 total events over the last 30 years, alongside two flash flood events.

Recent history demonstrates multiple flood mechanisms in the area. In March 2019, above-normal snowpack melt and ice jamming caused flooding along the Bad River and other regional waterways, inundating fields, damaging roads and culverts, and flooding some structures. Later, heavy rain brought additional flooding to Murdo and the surrounding area in April 2024. Summer thunderstorms have also produced heavy rainfall, such as an event in August 2024 when emergency management and trained spotters estimated approximately 3.5 inches of rain.

Properties situated near rivers, creeks, and low-lying areas—as well as residents in locations vulnerable to snowmelt, ice jams, and heavy localized rainfall—should pay the closest attention to flood risks in Jones County.

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

In their words

9 NOAA storm reports from Jones County describe what happened, in the words of the forecasters who covered it. Read the South Dakota flood stories →

Federal disasters

24 federal disaster declarations since 1976, 5 of them floods, coastal storms or hurricanes.

DisasterBegan
Severe Winter Storms And SnowstormDec 12, 2022
Severe Storm, Straight-line Winds, Tornadoes, And FloodingJun 11, 2022
Severe Storms And FloodingMay 21, 2019
Severe Winter Storm, Snowstorm, And FloodingMar 13, 2019
Severe Winter StormDec 24, 2016
Severe Storms, Tornadoes, Straight-line Winds, And FloodingJun 17, 2015
Severe Winter Storm And SnowstormDec 23, 2009
Hurricane Katrina EvacuationSep 6, 2005

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

Recorded flood events

26 since 1996: 2 flash floods and 24 river or area floods.

EventDateDamage
Flash FloodAug 21, 2024—
FloodApr 15, 2024—
FloodJun 18, 2020—
FloodMay 27, 2019—
FloodMar 27, 2019—
FloodMar 25, 2019—
FloodMay 23, 2019—
FloodMay 22, 2019—

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

From the storm reports

Flash Flood · Aug 21, 2024. Widespread, slow moving thunderstorms brought hail, gusty wnds and heavy rain to portions of central South Dakota on the afternoon and evening of August 21st. Hail to the size of tennis balls was observed by a trained spotter 4 miles northwest of Murdo. A peak wind speed of 65 mph was observed at a weather station 13 miles north northwest of Sansarc while the ASOS in Pierre peaked at 59 mph. Emergency management…

Flood · Apr 15, 2024. Low pressure south of the region helped generate isolated strong thunderstorms during the evening of April 15th into the early morning hours of April 16th. Two reported observations included wind gusts of 60 mph, one in Tolstoy as well as 3 miles southeast of Reliance. Additionally, hail to the size of quarters was observed in Gettysburg. Heavy rain was also responsible for flooding in parts of Murdo and the surro…

Flood · Jun 18, 2020. Heavy rains of 2 to 3 inches brought minor flooding of county roads around the Draper area.

Flood · May 27, 2019. A series of disturbances associated with a persistent area of low pressure over the western half of the U.S. produced several rounds of heavy rain. This rainfall, coupled with saturated soils from a wet early spring and flooding over the previous week, led to more flooding on the White River.

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 Jones County

If a building in Jones 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.