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Flood in Washington County, Missouri
27 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.
Washington County, Missouri, has 27 flood events in the NCEI record since 1950, with at least one in 18 different years.
April is the busiest month, with 9 of the recorded events. The last 20 years account for 22 events against 5 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.2% of the 10,821 flood events recorded in Missouri; its 3.6 per 100 square miles compares with 15.7 statewide.
Compared with Missouri
| Measure | Washington County | Missouri | US |
|---|---|---|---|
| Flood events since 1950 | 27 | 10,821 | 183,559 |
| Per 100 square miles | 3.6 | 15.7 | 5.2 |
| Per 10,000 residents | 11.5 | 17.5 | 5.5 |
| Deaths recorded | 0 | 159 | 2,961 |
| Busiest month | April | May | June |
By year
Seasonality
1Feb
1Mar
3Apr
9May
4Jun
4Jul
2Aug
2Sep
0Oct
0Nov
1Dec
0
Recorded events
All 27 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 |
|---|---|---|---|---|---|---|---|
| 7 Mar 2026 | Flash Flood | — | — | — | — | — | County |
| 4 Apr 2025 | Flash Flood | — | — | — | — | — | County |
| 4 Nov 2024 | Flash Flood | — | — | — | — | — | County |
| 16 Jul 2021 | Flash Flood | — | — | — | — | — | County |
| 29 Apr 2021 | Flash Flood | — | — | — | — | — | County |
| 29 Apr 2017 | Flash Flood | — | — | — | — | — | County |
| 15 Aug 2016 | Flash Flood | — | — | — | — | — | County |
| 11 May 2016 | Flash Flood | — | — | — | — | 4 | County |
| 10 Aug 2015 | Flash Flood | — | — | — | — | — | County |
| 16 Jun 2015 | Flood | — | — | — | — | — | County |
| 8 Apr 2015 | Flash Flood | — | — | — | — | — | County |
| 7 Apr 2015 | Flash Flood | — | — | — | — | — | County |
| 3 Apr 2014 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2013 | Flash Flood | — | — | — | — | — | County |
| 31 May 2013 | Flash Flood | — | — | — | — | — | County |
| 13 Jul 2011 | Flash Flood | — | — | — | — | — | County |
| 26 Jun 2011 | Flash Flood | — | — | — | — | — | County |
| 24 Apr 2011 | Flash Flood | — | — | — | — | — | County |
| 8 May 2009 | Flash Flood | — | — | — | — | — | County |
| 18 Mar 2008 | Flash Flood | — | — | — | — | — | County |
| 5 Feb 2008 | Flash Flood | — | — | — | — | — | County |
| 13 Jan 2007 | Flood | — | — | — | — | — | County |
| 12 Mar 2006 | Flash Flood | — | — | — | — | — | County |
| 21 Apr 2005 | Flash Flood | — | — | — | — | — | County |
| 12 May 2002 | Flash Flood | — | — | — | — | — | County |
| 22 Jun 1997 | Flash Flood | — | — | — | — | — | County |
| 19 Apr 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Washington County had?
27 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 Washington County?
7 Mar 2026 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Washington County?
NCEI records no damage estimate for events of this type in the county.
How does Washington County compare with Missouri for flood?
3.6 events per 100 square miles against 15.7 statewide; the county holds 27 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.