States › Missouri › Mercer County › Flood
Flood in Mercer County, Missouri
13 floods and flash floods events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
Mercer County, Missouri, has 13 flood events in the NCEI record since 1950, with at least one in 11 different years.
June is the busiest month, with 5 of the recorded events. The last 20 years account for 10 events against 3 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.1% of the 10,821 flood events recorded in Missouri; its 2.9 per 100 square miles compares with 15.7 statewide.
Compared with Missouri
| Measure | Mercer County | Missouri | US |
|---|---|---|---|
| Flood events since 1950 | 13 | 10,821 | 183,559 |
| Per 100 square miles | 2.9 | 15.7 | 5.2 |
| Per 10,000 residents | 37.3 | 17.5 | 5.5 |
| Deaths recorded | 0 | 159 | 2,961 |
| Busiest month | June | May | June |
By year
Seasonality
0Feb
0Mar
0Apr
0May
3Jun
5Jul
2Aug
2Sep
1Oct
0Nov
0Dec
0
Recorded events
All 13 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 4 Aug 2023 | Flash Flood | — | — | — | — | — | County |
| 24 Jun 2021 | Flash Flood | — | — | — | — | — | County |
| 24 Jun 2021 | Flash Flood | — | — | — | — | — | County |
| 24 Jun 2021 | Flash Flood | — | — | — | — | — | County |
| 28 May 2019 | Flash Flood | — | — | — | — | — | County |
| 9 Aug 2015 | Flash Flood | — | — | — | — | — | County |
| 3 Jun 2014 | Flood | — | — | — | — | — | County |
| 21 Sep 2010 | Flash Flood | — | — | — | — | — | County |
| 15 May 2009 | Flash Flood | — | — | — | — | — | County |
| 24 Jul 2008 | Flash Flood | — | — | — | — | — | County |
| 13 Jul 2006 | Flash Flood | — | — | — | — | — | County |
| 22 May 2005 | Flash Flood | — | — | — | — | — | County |
| 12 Jun 2004 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Mercer County had?
13 events in the NCEI Storm Events record between 1950 and 2026. Reporting of floods and flash floods became far more complete after 1996, so early decades undercount.
When was the last recorded flood event in Mercer County?
4 Aug 2023 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Mercer County?
NCEI records no damage estimate for events of this type in the county.
How does Mercer County compare with Missouri for flood?
2.9 events per 100 square miles against 15.7 statewide; the county holds 13 of the state's 10,821 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Flood hub and the county page.