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Flood in Johnson County, Nebraska
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.
Johnson County, Nebraska, has 13 flood events in the NCEI record since 1950, with at least one in 9 different years.
May is the busiest month, with 9 of the recorded events. The last 20 years account for 7 events against 6 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.6% of the 2,363 flood events recorded in Nebraska; its 3.5 per 100 square miles compares with 3.1 statewide.
Compared with Nebraska
| Measure | Johnson County | Nebraska | US |
|---|---|---|---|
| Flood events since 1950 | 13 | 2,363 | 183,559 |
| Per 100 square miles | 3.5 | 3.1 | 5.2 |
| Per 10,000 residents | 24.5 | 12.0 | 5.5 |
| Deaths recorded | 0 | 13 | 2,961 |
| Busiest month | May | June | June |
By year
Seasonality
0Feb
0Mar
0Apr
1May
9Jun
2Jul
0Aug
0Sep
0Oct
1Nov
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 |
|---|---|---|---|---|---|---|---|
| 18 May 2026 | Flash Flood | — | — | — | — | — | County |
| 16 May 2026 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2023 | Flood | — | — | — | — | — | County |
| 8 Oct 2018 | Flood | — | — | — | — | — | County |
| 4 Jun 2015 | Flash Flood | — | $20K | $25K | — | — | County |
| 25 Apr 2008 | Flood | — | $1.0M | — | — | — | County |
| 6 May 2007 | Flash Flood | — | $100K | — | — | — | County |
| 29 May 2004 | Flash Flood | — | — | — | — | — | County |
| 4 May 2001 | Flash Flood | — | — | — | — | — | County |
| 26 May 1996 | Flash Flood | — | — | — | — | — | County |
| 23 May 1996 | Flash Flood | — | $400K | $1.6M | — | — | County |
| 8 May 1996 | Flash Flood | — | — | — | — | — | County |
| 8 May 1996 | Flash Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Johnson 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 Johnson County?
18 May 2026 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Johnson County?
The flash flood of 23 May 1996, with property damage estimated by NCEI at $400K and crop damage at $1.6M.
How does Johnson County compare with Nebraska for flood?
3.5 events per 100 square miles against 3.1 statewide; the county holds 13 of the state's 2,363 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.