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Flood in Delta County, Colorado
18 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.
Delta County, Colorado, has 18 flood events in the NCEI record since 1950, with at least one in 11 different years.
July is the busiest month, with 8 of the recorded events. The last 20 years account for 11 events against 7 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.9% of the 1,956 flood events recorded in Colorado; its 1.6 per 100 square miles compares with 1.9 statewide.
Compared with Colorado
| Measure | Delta County | Colorado | US |
|---|---|---|---|
| Flood events since 1950 | 18 | 1,956 | 183,559 |
| Per 100 square miles | 1.6 | 1.9 | 5.2 |
| Per 10,000 residents | 5.7 | 3.4 | 5.5 |
| Deaths recorded | 0 | 47 | 2,961 |
| Busiest month | July | July | June |
By year
Seasonality
0Feb
0Mar
1Apr
1May
5Jun
0Jul
8Aug
2Sep
1Oct
0Nov
0Dec
0
Recorded events
All 18 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 |
|---|---|---|---|---|---|---|---|
| 24 May 2023 | Flood | — | $10K | — | — | — | County |
| 21 May 2023 | Flood | — | $5K | — | — | — | County |
| 20 May 2023 | Flood | — | $3K | — | — | — | County |
| 20 May 2023 | Flood | — | $3K | — | — | — | County |
| 13 Apr 2023 | Flood | — | $1K | — | — | — | County |
| 23 Jul 2021 | Flood | — | $2K | — | — | — | County |
| 26 Jul 2019 | Flash Flood | — | — | — | — | — | County |
| 29 Jul 2014 | Flash Flood | — | — | — | — | — | County |
| 18 Jul 2013 | Flash Flood | — | — | — | — | — | County |
| 18 Jul 2013 | Flash Flood | — | $150K | — | — | — | County |
| 10 Jul 2011 | Flash Flood | — | — | — | — | — | County |
| 20 Jul 2006 | Flash Flood | — | $40K | — | — | — | County |
| 12 Aug 2003 | Flash Flood | — | $5K | — | — | — | County |
| 11 Sep 2002 | Flash Flood | — | $25K | — | — | — | County |
| 22 Aug 2001 | Flood | — | — | $100K | — | — | County |
| 26 Jul 2001 | Flood | — | — | — | — | — | County |
| 12 Mar 2001 | Flood | — | $2K | — | — | — | County |
| 2 May 1998 | Flash Flood | — | $1.4M | $100K | — | — | County |
Questions and answers
How many flood events has Delta County had?
18 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 Delta County?
24 May 2023 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Delta County?
The flash flood of 2 May 1998, with property damage estimated by NCEI at $1.4M and crop damage at $100K.
How does Delta County compare with Colorado for flood?
1.6 events per 100 square miles against 1.9 statewide; the county holds 18 of the state's 1,956 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.