Enter any address in Oglala Lakota County, South Dakota to see its FEMA flood zone
Flash flooding from heavy rainfall events is a significant flood character in Oglala Lakota County. Between 2003 and 2023, NOAA Storm Events data recorded 18 flood events and 9 flash flood events. Recent examples include flash flooding in Porcupine in August 2022, where heavy rain from thunderstorms caused water to run over roads. In May 2023, prolonged rainfall over several days led to minor flooding in larger rivers following heavy downpours in the Cheyenne and White River basins.
Residents in Oglala Lakota County should be aware of their proximity to waterways and the potential for heavy rainfall. Those residing in areas prone to rapid water accumulation or near the Cheyenne and White River basins may face a higher risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
8 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Oglala Lakota County, South Dakota has recorded 27 flood-related events since 1996 according to NOAA's Storm Events Database, including 9 flash floods and 18 river or area floods. Enter any address above to check its FEMA flood zone designation.
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flood | May 12, 2023 | 0.00K |
| Flood | May 11, 2023 | 0.00K |
| Flash Flood | May 11, 2023 | 0.00K |
| Flash Flood | Aug 24, 2022 | 0.00K |
| Flash Flood | Jul 29, 2020 | 0.00K |
| Flood | May 28, 2019 | 0.00K |
| Flood | May 26, 2019 | 0.00K |
| Flood | May 21, 2019 | 100.00K |
| Flood | Mar 17, 2019 | 500.00K |
| Flood | Aug 11, 2019 | 0.00K |
Flood — May 12, 2023
A prolonged rain event over several days led to flooding and flash flooding over the Cheyenne and White River basins. Three to five inches of rain fell, with some locations receiving nearly four inches of rain within six hours on the evening of May 11. As the water flowed into larger rivers, minor flooding was observed.
Flood — May 11, 2023
A prolonged rain event over several days led to flooding and flash flooding over the Cheyenne and White River basins. Three to five inches of rain fell, with some locations receiving nearly four inches of rain within six hours on the evening of May 11. As the water flowed into larger rivers, minor flooding was observed.
Flash Flood — May 11, 2023
A prolonged rain event over several days led to flooding and flash flooding over the Cheyenne and White River basins. Three to five inches of rain fell, with some locations receiving nearly four inches of rain within six hours on the evening of May 11. As the water flowed into larger rivers, minor flooding was observed.
Flash Flood — Aug 24, 2022
A supercell thunderstorm developed over the southern Black Hills and tracked southeast, weakening on the adjacent plains. The storm produced large hail and heavy rain over the area. Other strong thunderstorms produced heavy rain and localized flash flooding over far southwestern South Dakota. Rain amounts of three to four inches were estimated in some areas. In Oglala Lakota County, flash flood...
Flash Flood — Jul 29, 2020
Slow moving and stationary thunderstorms with heavy rain resulted in flash flooding over portions of southwestern South Dakota.
Source: NOAA National Weather Service Storm Events Database.
FEMA assigns flood zone designations to areas in Oglala Lakota County, South Dakota:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Oglala Lakota County, South Dakota that are in FEMA-designated Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
Even outside high-risk zones, flood insurance is recommended. From 2014 to 2024, nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area.
Visit FloodSmart.gov to find an agent and get a quote.