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Flood in Calhoun County, Iowa
61 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.
Calhoun County, Iowa, has 61 flood events in the NCEI record since 1950, with at least one in 15 different years.
June is the busiest month, with 23 of the recorded events. The last 20 years account for 20 events against 41 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.8% of the 7,383 flood events recorded in Iowa; its 10.7 per 100 square miles compares with 13.2 statewide.
Compared with Iowa
| Measure | Calhoun County | Iowa | US |
|---|---|---|---|
| Flood events since 1950 | 61 | 7,383 | 183,559 |
| Per 100 square miles | 10.7 | 13.2 | 5.2 |
| Per 10,000 residents | 61.5 | 23.1 | 5.5 |
| Deaths recorded | 0 | 18 | 2,961 |
| Busiest month | June | June | June |
By year
Seasonality
0Feb
1Mar
1Apr
8May
9Jun
23Jul
5Aug
12Sep
1Oct
0Nov
0Dec
1
Recorded events
All 61 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 |
|---|---|---|---|---|---|---|---|
| 21 Jun 2019 | Flash Flood | — | — | — | — | — | County |
| 20 Jun 2018 | Flash Flood | — | $50K | $50K | — | — | County |
| 15 Sep 2016 | Flash Flood | — | $15K | — | — | — | County |
| 14 Dec 2015 | Flood | — | $20K | — | — | — | County |
| 10 Aug 2010 | Flash Flood | — | $10K | — | — | — | County |
| 10 Aug 2010 | Flash Flood | — | $10K | — | — | — | County |
| 22 Jul 2010 | Flash Flood | — | $250K | — | — | — | County |
| 27 Jun 2010 | Flash Flood | — | $25K | — | — | — | County |
| 27 Jun 2010 | Flash Flood | — | $50K | — | — | — | County |
| 12 Jun 2010 | Flood | — | — | $20M | — | — | County |
| 28 Aug 2007 | Flash Flood | — | $75K | — | — | — | County |
| 28 Aug 2007 | Flash Flood | — | $10K | $10K | — | — | County |
| 28 Aug 2007 | Flash Flood | — | $50K | — | — | — | County |
| 20 Aug 2007 | Flash Flood | — | $5K | — | — | — | County |
| 20 Aug 2007 | Flash Flood | — | $50K | — | — | — | County |
| 20 Aug 2007 | Flash Flood | — | $25K | $5K | — | — | County |
| 20 Aug 2007 | Flash Flood | — | $25K | $10K | — | — | County |
| 4 Aug 2007 | Flash Flood | — | $10K | — | — | — | County |
| 4 Aug 2007 | Flash Flood | — | $15K | $10K | — | — | County |
| 25 Apr 2007 | Flood | — | $250K | — | — | — | County |
| 26 Jul 2005 | Flood | — | $10K | $30K | — | — | Forecast zone |
| 26 Jun 2005 | Flood | — | $50K | $10K | — | — | Forecast zone |
| 26 Jun 2005 | Flood | — | $74K | $50K | — | — | Forecast zone |
| 25 Jun 2005 | Flash Flood | — | $50K | $5K | — | — | County |
| 12 Jun 2005 | Flood | — | $25K | $10K | — | — | Forecast zone |
| 13 May 2005 | Flood | — | $30K | — | — | — | Forecast zone |
| 16 Jun 2004 | Flash Flood | — | $50K | $10K | — | — | County |
| 22 May 2004 | Flood | — | $100K | $298K | — | — | Forecast zone |
| 5 Jul 2003 | Flood | — | $10K | $25K | — | — | Forecast zone |
| 27 Jun 2003 | Flood | — | $5K | $10K | — | — | Forecast zone |
| 9 May 2003 | Flood | — | $5K | — | — | — | Forecast zone |
| 4 May 2003 | Flood | — | $5K | — | — | — | Forecast zone |
| 11 May 2002 | Flood | — | $10K | — | — | — | Forecast zone |
| 2 Aug 2001 | Flash Flood | — | $100K | $10K | — | — | County |
| 12 Jun 2001 | Flood | — | $25K | $50K | — | — | Forecast zone |
| 21 May 2001 | Flood | — | $30K | — | — | — | Forecast zone |
| 1 May 2001 | Flash Flood | — | $250K | — | — | 1 | County |
| 1 May 2001 | Flood | — | $75K | — | — | — | Forecast zone |
| 7 Apr 2001 | Flood | — | $150K | — | — | — | Forecast zone |
| 23 Mar 2001 | Flood | — | $8K | — | — | — | Forecast zone |
| 27 Jun 1999 | Flood | — | $5K | $5K | — | — | Forecast zone |
| 9 Jun 1999 | Flood | — | $50K | $75K | — | — | Forecast zone |
| 22 Apr 1999 | Flood | — | $10K | — | — | — | Forecast zone |
| 6 Apr 1999 | Flood | — | $7K | — | — | — | Forecast zone |
| 6 Jul 1998 | Flood | — | $50K | $100K | — | — | Forecast zone |
| 29 Jun 1998 | Flood | — | $50K | $10K | — | — | County |
| 24 Jun 1998 | Flood | — | $75K | $20K | — | — | Forecast zone |
| 23 Jun 1998 | Flash Flood | — | $75K | $10K | — | — | County |
| 14 Jun 1998 | Flood | — | $100K | $20K | — | — | Forecast zone |
| 16 May 1998 | Flood | — | $20K | $10K | — | — | Forecast zone |
| 21 Apr 1998 | Flood | — | $500 | — | — | — | Forecast zone |
| 16 Apr 1998 | Flood | — | $5K | — | — | — | Forecast zone |
| 7 Apr 1998 | Flood | — | $15K | — | — | — | Forecast zone |
| 6 Apr 1998 | Flood | — | $50K | — | — | — | County |
| 18 Feb 1997 | Flood | — | — | — | — | — | Forecast zone |
| 17 Jul 1996 | Flood | — | — | — | — | — | Forecast zone |
| 21 Jun 1996 | Flood | — | $30K | $5K | — | — | County |
| 20 Jun 1996 | Flood | — | — | — | — | — | Forecast zone |
| 17 Jun 1996 | Flood | — | — | — | — | — | Forecast zone |
| 16 Jun 1996 | Flash Flood | — | $150K | $20K | — | — | County |
| 16 Jun 1996 | Flood | — | $10K | — | — | — | County |
Questions and answers
How many flood events has Calhoun County had?
61 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 Calhoun County?
21 Jun 2019 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Calhoun County?
The flood of 12 Jun 2010, with property damage estimated by NCEI at $0 and crop damage at $20M.
How does Calhoun County compare with Iowa for flood?
10.7 events per 100 square miles against 13.2 statewide; the county holds 61 of the state's 7,383 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.