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Flood in Delaware County, Oklahoma
44 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.
NCEI records 44 flood events in Delaware County, Oklahoma, between 1950 and 2026, spread over 18 years.
June is the busiest month, with 8 of the recorded events. The last 20 years account for 25 events against 19 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1% of the 4,346 flood events recorded in Oklahoma; its 6.0 per 100 square miles compares with 6.3 statewide.
NCEI attributes 1 death in the county to floods and flash floods.
Compared with Oklahoma
| Measure | Delaware County | Oklahoma | US |
|---|---|---|---|
| Flood events since 1950 | 44 | 4,346 | 183,559 |
| Per 100 square miles | 6.0 | 6.3 | 5.2 |
| Per 10,000 residents | 10.7 | 10.9 | 5.5 |
| Deaths recorded | 1 | 91 | 2,961 |
| Busiest month | June | May | June |
By year
Seasonality
1Feb
2Mar
4Apr
5May
6Jun
8Jul
4Aug
3Sep
6Oct
2Nov
1Dec
2
Recorded events
All 44 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 |
|---|---|---|---|---|---|---|---|
| 8 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 28 Apr 2021 | Flash Flood | — | — | — | — | — | County |
| 14 Aug 2020 | Flash Flood | — | — | — | — | — | County |
| 6 Oct 2019 | Flood | — | — | — | — | — | County |
| 23 Jun 2019 | Flash Flood | — | — | — | — | — | County |
| 30 Apr 2019 | Flash Flood | — | — | — | — | — | County |
| 29 Apr 2017 | Flood | — | — | — | — | — | County |
| 27 Dec 2015 | Flood | — | — | — | — | — | County |
| 27 Dec 2015 | Flood | — | — | — | — | — | County |
| 9 Jul 2015 | Flash Flood | — | $75K | — | — | — | County |
| 28 May 2015 | Flash Flood | — | — | — | — | — | County |
| 8 Aug 2013 | Flash Flood | — | — | — | — | — | County |
| 18 Apr 2013 | Flash Flood | — | — | — | — | — | County |
| 18 Apr 2013 | Flood | — | — | — | — | — | County |
| 20 Mar 2012 | Flash Flood | — | — | — | — | — | County |
| 9 Sep 2010 | Flash Flood | — | $50K | — | — | — | County |
| 25 Mar 2010 | Flash Flood | — | — | — | — | — | County |
| 10 Sep 2009 | Flash Flood | — | — | — | — | — | County |
| 9 Sep 2009 | Flash Flood | — | — | — | — | — | County |
| 1 May 2009 | Flash Flood | — | — | — | — | — | County |
| 7 May 2008 | Flash Flood | — | — | — | — | — | County |
| 31 Mar 2008 | Flash Flood | — | — | — | — | — | County |
| 18 Mar 2008 | Flash Flood | — | $50K | — | — | — | County |
| 16 Feb 2008 | Flash Flood | — | — | — | 1 | — | County |
| 7 Jan 2008 | Flash Flood | — | — | — | — | — | County |
| 13 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 3 Jul 2004 | Flood | — | — | — | — | — | Forecast zone |
| 13 May 2004 | Flash Flood | — | — | — | — | — | County |
| 7 Aug 2001 | Flood | — | — | — | — | — | County |
| 24 Jul 2001 | Flash Flood | — | — | — | — | — | County |
| 3 Jun 2001 | Flash Flood | — | $5K | — | — | — | County |
| 28 Jun 2000 | Flash Flood | — | — | — | — | — | County |
| 21 Jun 2000 | Flood | — | — | — | — | — | Forecast zone |
| 21 Jun 2000 | Flash Flood | — | $75K | — | — | — | County |
| 16 Jun 2000 | Flash Flood | — | — | — | — | — | County |
| 9 May 2000 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 1999 | Flood | — | — | — | — | — | Forecast zone |
| 4 May 1999 | Flash Flood | — | — | — | — | — | County |
| 6 Feb 1999 | Flash Flood | — | — | — | — | — | County |
| 5 Oct 1998 | Flash Flood | — | $5K | — | — | — | County |
| 14 Sep 1998 | Flash Flood | — | — | — | — | — | County |
| 6 Nov 1996 | Flash Flood | — | — | — | — | — | County |
| 26 Sep 1996 | Flash Flood | — | — | — | — | — | County |
| 26 Sep 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Delaware County had?
44 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 Delaware County?
8 Jun 2026 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Delaware County?
The flash flood of 21 Jun 2000, with property damage estimated by NCEI at $75K.
How does Delaware County compare with Oklahoma for flood?
6.0 events per 100 square miles against 6.3 statewide; the county holds 44 of the state's 4,346 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.