South Dakota, 2023Flash Flood and Flooding in South Dakota, May 11 to 16, 2023
May 11 to 16, 2023 · NWS UNR · 7 events in 5 counties and zones
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.
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- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 7
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
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, Oglala Lakota
- When
- May 11, 6:30 PM MST to 10:00 PM MST
- Where
- Oglala Lakota County, 3.67 mi SW of Pine Ridge to 5.43 mi S of Batesland
- Cause
- Heavy Rain
- Reported by
- Emergency Manager
- Coordinates
- 43.000, -102.620
Flooding along Potato Creek inundated the bridge on BIA2. The heavy rain washed gravel off several tribal roads and water inundated several fields and low-lying areas.
Flood, Oglala Lakota
- When
- May 11, 10:00 PM MST to May 13, 7:00 AM MST
- Where
- Oglala Lakota County, 3.67 mi SW of Pine Ridge to 1.22 mi S of Batesland
- Cause
- Heavy Rain
- Reported by
- Emergency Manager
- Coordinates
- 43.000, -102.620
Minor flooding continued along Potato Creek and along several other smaller streams across the area. Normally dry creeks and low-lying areas were inundated.
Flood, Ziebach
- When
- May 12, 11:45 AM MST to May 16, 6:00 PM MST
- Where
- Ziebach County, 7.21 mi NE of Cherry Creek to 8.08 mi ENE of Cherry Creek
- Cause
- Heavy Rain
- Reported by
- River/Stream Gage
- Coordinates
- 44.660, -101.380
Minor flooding of agricultural land along the Cheyenne River occurred. The river gage crested at 22.65 feet on May 15 at 500 AM MDT.
Flood, Haakon
- When
- May 12, 11:45 AM MST to May 16, 6:00 PM MST
- Where
- Haakon County, 8.98 mi NNW of Kirley to 10.44 mi NNE of Kirley
- Cause
- Heavy Rain
- Reported by
- River/Stream Gage
- Coordinates
- 44.640, -101.370
Minor flooding of agricultural land along the Cheyenne river occurred. The river gage crested at 22.65 feet on May 15 at 500 AM MDT.
Flood, Oglala Lakota
- When
- May 12, 3:45 PM MST
- Where
- Oglala Lakota County, 11.37 mi ENE of Rockyford to 18.03 mi ENE of Rockyford
- Cause
- Heavy Rain
- Reported by
- River/Stream Gage
- Coordinates
- 43.590, -102.310
Minor flooding of agricultural land along the White River occurred.
Flood, Pennington
- When
- May 12, 3:45 PM MST to May 13, 2:45 AM MST
- Where
- Pennington County, 18.33 mi ESE of Scenic to 18.66 mi SSE of Quinn
- Cause
- Heavy Rain
- Reported by
- River/Stream Gage
- Coordinates
- 43.680, -102.210
Minor flooding of agricultural land along the White River occurred.
Flood, Jackson
- When
- May 12, 3:45 PM MST to May 13, 2:45 AM MST
- Where
- Jackson County, 8.58 mi WSW of Interior to 8.11 mi NNW of Wanblee
- Cause
- Heavy Rain
- Reported by
- River/Stream Gage
- Coordinates
- 43.675, -102.140
Minor flooding of agricultural land along the White River occurred. The river gage crested at 15.1 feet on May 12 at 1115 PM MDT.
- Flash Flood
- Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
- Flood
- Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
After NWS Directive 10-1605, the rules offices file Storm Data by.
- Tornadoes and Hail in Oklahoma, May 11, 2023$319,000 · EF1 · 22 events
- Hail and Damaging Winds in Mississippi, May 11, 2023$253,000 · 1.75 in hail · 33 events
- Tornadoes and Flash Flooding in Louisiana, May 11, 2023$80,000 · EF1 · 15 events
- Tornado and Hail in Texas, May 11, 2023$36,000 · EF1 · 10 events
- Tornado in Arkansas, May 11, 2023$40,000 · EF1 · 1 event
- Tornadoes and Flash Flooding in Kansas, May 11 to 12, 2023$10,000 · EF1 · 20 events
- Damaging Winds in Louisiana, May 11, 2023$40,000 · 56 kt wind · 10 events
- Damaging Winds and Lightning Strike in Mississippi, May 11, 2023$40,000 · 50 kt wind · 3 events
- Tornadoes and Hail in Colorado, May 11, 2023EF1 · 5 events
- Flash Flooding and Damaging Winds in Nebraska, May 11, 2023$30,000 · 52 kt wind · 4 events
- Damaging Winds and High Wind in Texas, May 11, 2023$20,000 · 70 kt wind · 4 events
- Hail and Damaging Winds in Georgia, May 11 to 12, 20232.5 in hail · 16 events
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1093361, 1093363, 1093488, 1093489, 1093365, 1093366, 1093367.