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Flood in Grainger County, Tennessee
15 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 15 flood events in Grainger County, Tennessee, between 1950 and 2026, spread over 11 years.
February is the busiest month, with 6 of the recorded events. The last 20 years account for 6 events against 9 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.3% of the 4,414 flood events recorded in Tennessee; its 5.3 per 100 square miles compares with 10.7 statewide.
NCEI attributes 1 death in the county to floods and flash floods.
Compared with Tennessee
| Measure | Grainger County | Tennessee | US |
|---|---|---|---|
| Flood events since 1950 | 15 | 4,414 | 183,559 |
| Per 100 square miles | 5.3 | 10.7 | 5.2 |
| Per 10,000 residents | 6.3 | 6.3 | 5.5 |
| Deaths recorded | 1 | 121 | 2,961 |
| Busiest month | February | February | June |
By year
Seasonality
0Feb
6Mar
3Apr
1May
1Jun
0Jul
2Aug
1Sep
1Oct
0Nov
0Dec
0
Recorded events
All 15 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 |
|---|---|---|---|---|---|---|---|
| 14 Aug 2023 | Flash Flood | — | — | — | — | — | County |
| 24 Feb 2022 | Flood | — | — | — | — | — | County |
| 18 Mar 2021 | Flood | — | — | — | — | — | County |
| 23 Feb 2019 | Flood | — | $700K | — | — | — | County |
| 28 Feb 2011 | Flood | — | $80K | — | — | — | County |
| 26 Sep 2009 | Flood | — | — | — | — | — | County |
| 10 Apr 2003 | Flood | — | — | — | — | — | Forecast zone |
| 21 Feb 2003 | Flood | — | — | — | — | — | Forecast zone |
| 16 Feb 2003 | Flash Flood | — | — | — | — | — | County |
| 14 Feb 2003 | Flood | — | $536K | — | — | — | Forecast zone |
| 18 Mar 2002 | Flash Flood | — | — | — | — | — | County |
| 17 Mar 2002 | Flood | — | — | — | — | — | Forecast zone |
| 11 Jul 1999 | Flash Flood | — | — | — | — | — | County |
| 7 May 1998 | Flood | — | — | — | — | — | County |
| 1 Jul 1997 | Flash Flood | — | — | — | 1 | — | County |
Questions and answers
How many flood events has Grainger County had?
15 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 Grainger County?
14 Aug 2023 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Grainger County?
The flood of 23 Feb 2019, with property damage estimated by NCEI at $700K.
How does Grainger County compare with Tennessee for flood?
5.3 events per 100 square miles against 10.7 statewide; the county holds 15 of the state's 4,414 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.