98
Recorded events
0
Direct deaths
0
Direct injuries
$232K
Property damage
Flood in Mariposa County, California: 98 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #57 nationally and #13 statewide for this hazard.
Decade by decade
Flood in Mariposa County, California: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flood in Mariposa County is the 2020s, when 49 of the county's 98 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.
Within the Mariposa County archive, flood makes up 39.0% of all recorded severe weather across 11 hazard types. Nationally the county sits at #57 for this hazard and #13 within California, putting it in the 98.1 percentile of all U.S. counties.
Seasonality
Events by month
Jan is the peak month for flood in Mariposa County with 36 recorded events, while Jul is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Mar 18, 2025 | BRICEBURG | 0 | $0 |
| Feb 14, 2025 | MORMON BAR | 0 | $0 |
| Feb 14, 2025 | CATHEYS VLY | 0 | $0 |
| Feb 14, 2025 | HORNITOS | 0 | $0 |
| Jan 22, 2024 | BRICEBURG | 0 | $0 |
| Jun 1, 2023 | YOSEMITE NATL PARK | 0 | $0 |
| May 16, 2023 | CAMP CURRY | 0 | $0 |
| Mar 15, 2023 | HORNITOS | 0 | $0 |
| Mar 10, 2023 | DARRAH | 0 | $0 |
| Mar 10, 2023 | SUMMIT INN | 0 | $0 |
Other hazards here
More from Mariposa County
- Heavy Rain 56
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
After the much delayed spring warming, snowmelt runoff finally began in earnest with the Merced River reaching a height of 10.5 feet in the wee hours of the morning of Monday, June 16th, with a flow of 7111CFS at the Pohono Bridge Gauge in lower Yosemite Valley. The warning stage is 9.5 feet with flood stage at 12.0 feet. Per WSOM definition the flow was contained pretty much within the Merced riverbanks with some low-lying meadows flooded near the river and precautionary evacuations of 20 campsites right on the river by the Park Service. No damage reported on the Yosemite Valley floor from the flooding although a repair in State Highway 140 just downstream of the Pohono Bridge from the January 1997 floods again failed due to the increase in water pressure from the rise in the river.
From about mid June on, the Merced river in Yosemite National Park peaked very close to flood stage, and on a few occasions rose above flood stage, and forced several campgrounds to close because of minor flooding problems.
Yosemite National Park Rangers reported that the Merced River exceeded its flood stage of 10 feet at Pohono Bridge between June 1 and June 7, June 10 and June 12 and June 14 and 18. The Merced River exceeded its flood stage of 8 feet at Happy Isles between June 14 and 18.
Quick answers
Frequently asked
How many flood events are on record in Mariposa County, California?
98 flood events are recorded in Mariposa County between 1996 and 2025, causing 0 direct deaths.
What is the strongest flood recorded in Mariposa County?
The strongest flood on record in Mariposa County measured 0.
Where does the flood data for Mariposa County come from?
All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.
Cite this page
“Flood in Mariposa County, California.” Severe Weather History. severeweatherhistory.com/county/california/mariposa-county/flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.