Rivers in California
Santa Margarita River at Ysidora
Below flood stage
6.87ftStage
Observed Sun, Sep 27, 6:15 AM PDT
- Flood stage
- 12.50 ft
- Forecast crest
- 7.18 ftSun, Sep 27, 7:00 AM PDT
- Record crest
- 20.47 ft1993
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 16.29 ft |
| Moderate flood | 13.78 ft |
| Minor flood | 12.50 ft |
| Action | 10.85 ft |
- 16.29 ftMajor flood, 37,000 cfs. Widespread inundation of Camp Pendleton with evacuations likely. Flood of Record Jan 16, 1993.
- 13.78 ftModerate flood stage, 17,000 cfs. Vandegrift Road is flooded for several miles downstream of the gage site. Stuart Mesa Road is flooded near the bridge.
- 12.50 ftMinor flood stage, 8,000 cfs. Vandegrift Road has begun to flood downstream of the gage. Stuart Mesa Road closures can be expected.
- 10.85 ft2,500 cfs. The river has reached monitor stage. Personnel begin regular patrols along the levee.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | Under 5% |
| Moderate flooding | Under 5% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 27, 2024.
Crest history
15 crests on NOAA’s list since 1927.
| # | Date | Stage |
|---|---|---|
| 1 | January 16, 1993 | 20.47 ft |
| 2 | February 18, 1980 | 18.80 ft |
| 3 | March 1, 1978 | 18.12 ft |
| 4 | February 16, 1927 | 18.00 ft |
| 5 | February 25, 1969 | 15.89 ft |
| 6 | February 14, 2019 | 15.07 ft |
| 7 | January 22, 2017 | 14.60 ft |
| 8 | January 23, 1943 | 14.05 ft |
| 9 | March 3, 1938 | 12.70 ft |
| 10 | January 10, 1995 | 12.68 ft |
| 11 | February 23, 1998 | 12.41 ft |
| 12 | January 16, 2023 | 11.73 ft |
| 13 | March 1, 1991 | 11.20 ft |
| 14 | February 7, 1937 | 10.50 ft |
| 15 | March 2, 1983 | 10.40 ft |
Most recent crests
- January 16, 2023: 11.73 ft
- February 14, 2019: 15.07 ft
- January 22, 2017: 14.60 ft
- February 23, 1998: 12.41 ft
- January 10, 1995: 12.68 ft
- January 16, 1993: 20.47 ft
- March 1, 1991: 11.20 ft
- March 2, 1983: 10.40 ft
- February 18, 1980: 18.80 ft
- March 1, 1978: 18.12 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the California Nevada River Forecast Center. Forecasts are issued routinely year-round.
Sources
Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.