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Flood in Mono County, California
24 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 24 flood events in Mono County, California, between 1950 and 2026, spread over 15 years.
July is the busiest month, with 9 of the recorded events. The last 20 years account for 18 events against 6 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.3% of the 7,136 flood events recorded in California; its 0.8 per 100 square miles compares with 4.6 statewide.
Compared with California
| Measure | Mono County | California | US |
|---|---|---|---|
| Flood events since 1950 | 24 | 7,136 | 183,559 |
| Per 100 square miles | 0.8 | 4.6 | 5.2 |
| Per 10,000 residents | 18.1 | 1.8 | 5.5 |
| Deaths recorded | 0 | 121 | 2,961 |
| Busiest month | July | January | June |
By year
Seasonality
1Feb
0Mar
3Apr
0May
3Jun
5Jul
9Aug
1Sep
1Oct
1Nov
0Dec
0
Recorded events
All 24 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 |
|---|---|---|---|---|---|---|---|
| 25 Jun 2024 | Flood | — | — | — | — | — | County |
| 3 May 2023 | Flood | — | — | — | — | — | County |
| 9 Mar 2023 | Flood | — | — | — | — | — | County |
| 9 Mar 2023 | Flood | — | — | — | — | — | County |
| 9 Mar 2023 | Flood | — | — | — | — | — | County |
| 15 Jul 2022 | Flash Flood | — | — | — | — | — | County |
| 6 May 2019 | Flood | — | — | — | — | — | County |
| 19 Jul 2018 | Flood | — | — | — | — | — | County |
| 18 Oct 2015 | Flash Flood | — | $300K | — | — | — | County |
| 1 Sep 2013 | Flash Flood | — | $40K | — | — | — | County |
| 3 Jul 2013 | Flash Flood | — | $100K | — | — | — | County |
| 28 Jun 2011 | Flood | — | $25K | — | — | — | County |
| 24 Jun 2011 | Flood | — | $5K | — | — | — | County |
| 24 Jun 2011 | Flood | — | $1K | — | — | — | County |
| 24 Jun 2011 | Flood | — | $500 | — | — | — | County |
| 16 Jul 2010 | Flash Flood | — | $1K | — | — | — | County |
| 15 Jul 2010 | Flash Flood | — | $5K | — | — | — | County |
| 25 Jul 2007 | Flash Flood | — | $10K | — | — | — | County |
| 18 Jul 2006 | Flash Flood | — | $5K | — | — | — | County |
| 19 May 2006 | Flood | — | $20K | — | — | — | County |
| 30 Jul 2003 | Flash Flood | — | $10K | — | — | — | County |
| 18 Jul 2002 | Flash Flood | — | $1K | — | — | — | County |
| 30 Aug 2000 | Flood | — | — | — | — | — | County |
| 1 Jan 1997 | Flood | — | — | — | — | — | Forecast zone |
Questions and answers
How many flood events has Mono County had?
24 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 Mono County?
25 Jun 2024 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Mono County?
The flash flood of 18 Oct 2015, with property damage estimated by NCEI at $300K.
How does Mono County compare with California for flood?
0.8 events per 100 square miles against 4.6 statewide; the county holds 24 of the state's 7,136 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.