Santa Margarita River at Ysidora
Critical Stages
10.85' - Action
12.5' - Flood
13.78' - Moderate
16.29' - Major
Latest Observation
Updated: 6:15 PM PST 12/8/25
Status: No Flooding
Stage: 7.08 ft
Flow: 0.019 kcfs
Forecast
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 7 PM 12/8 | 7.06 | 0.017 |
| 8 PM 12/8 | 7.06 | 0.017 |
| 9 PM 12/8 | 7.06 | 0.017 |
| 10 PM 12/8 | 7.06 | 0.017 |
| 11 PM 12/8 | 7.06 | 0.017 |
| 12 AM 12/9 | 7.05 | 0.017 |
| 1 AM 12/9 | 7.05 | 0.017 |
| 2 AM 12/9 | 7.05 | 0.017 |
| 3 AM 12/9 | 7.05 | 0.017 |
| 4 AM 12/9 | 7.05 | 0.017 |
| 5 AM 12/9 | 7.05 | 0.017 |
| 6 AM 12/9 | 7.05 | 0.017 |
| 7 AM 12/9 | 7.05 | 0.017 |
| 8 AM 12/9 | 7.05 | 0.017 |
| 9 AM 12/9 | 7.05 | 0.017 |
| 10 AM 12/9 | 7.05 | 0.017 |
| 11 AM 12/9 | 7.05 | 0.017 |
| 12 PM 12/9 | 7.05 | 0.017 |
| 1 PM 12/9 | 7.05 | 0.017 |
| 2 PM 12/9 | 7.05 | 0.017 |
| 3 PM 12/9 | 7.05 | 0.017 |
| 4 PM 12/9 | 7.05 | 0.017 |
| 5 PM 12/9 | 7.05 | 0.017 |
| 6 PM 12/9 | 7.05 | 0.017 |
| 7 PM 12/9 | 7.05 | 0.017 |
| 8 PM 12/9 | 7.05 | 0.017 |
| 9 PM 12/9 | 7.05 | 0.017 |
| 10 PM 12/9 | 7.05 | 0.017 |
| 11 PM 12/9 | 7.04 | 0.016 |
| 12 AM 12/10 | 7.04 | 0.016 |
| 1 AM 12/10 | 7.04 | 0.016 |
| 2 AM 12/10 | 7.04 | 0.016 |
| 3 AM 12/10 | 7.04 | 0.016 |
| 4 AM 12/10 | 7.04 | 0.016 |
| 5 AM 12/10 | 7.04 | 0.016 |
| 6 AM 12/10 | 7.04 | 0.016 |
| 7 AM 12/10 | 7.04 | 0.016 |
| 8 AM 12/10 | 7.04 | 0.016 |
| 9 AM 12/10 | 7.04 | 0.016 |
| 10 AM 12/10 | 7.04 | 0.016 |
| 11 AM 12/10 | 7.04 | 0.016 |
| 12 PM 12/10 | 7.04 | 0.016 |
| 1 PM 12/10 | 7.04 | 0.016 |
| 2 PM 12/10 | 7.04 | 0.016 |
| 3 PM 12/10 | 7.04 | 0.016 |
| 4 PM 12/10 | 7.04 | 0.016 |
| 5 PM 12/10 | 7.04 | 0.016 |
| 6 PM 12/10 | 7.04 | 0.016 |
| 7 PM 12/10 | 7.04 | 0.016 |
| 8 PM 12/10 | 7.04 | 0.016 |
| 9 PM 12/10 | 7.04 | 0.016 |
| 10 PM 12/10 | 7.04 | 0.016 |
| 11 PM 12/10 | 7.04 | 0.016 |
| 12 AM 12/11 | 7.04 | 0.016 |
| 1 AM 12/11 | 7.04 | 0.016 |
| 2 AM 12/11 | 7.04 | 0.016 |
| 3 AM 12/11 | 7.03 | 0.015 |
| 4 AM 12/11 | 7.03 | 0.015 |
| 5 AM 12/11 | 7.03 | 0.015 |
| 6 AM 12/11 | 7.03 | 0.015 |
| 7 AM 12/11 | 7.03 | 0.015 |
| 8 AM 12/11 | 7.03 | 0.015 |
| 9 AM 12/11 | 7.03 | 0.015 |
| 10 AM 12/11 | 7.03 | 0.015 |
| 11 AM 12/11 | 7.03 | 0.015 |
| 12 PM 12/11 | 7.03 | 0.015 |
| 1 PM 12/11 | 7.03 | 0.015 |
| 2 PM 12/11 | 7.03 | 0.015 |
| 3 PM 12/11 | 7.03 | 0.015 |
| 4 PM 12/11 | 7.03 | 0.015 |
| 5 PM 12/11 | 7.03 | 0.015 |
| 6 PM 12/11 | 7.03 | 0.015 |
| 7 PM 12/11 | 7.03 | 0.015 |
| 8 PM 12/11 | 7.03 | 0.015 |
| 9 PM 12/11 | 7.03 | 0.015 |
| 10 PM 12/11 | 7.03 | 0.015 |
| 11 PM 12/11 | 7.03 | 0.015 |
| 12 AM 12/12 | 7.03 | 0.015 |
| 1 AM 12/12 | 7.03 | 0.015 |
| 2 AM 12/12 | 7.03 | 0.015 |
| 3 AM 12/12 | 7.03 | 0.015 |
| 4 AM 12/12 | 7.03 | 0.015 |
| 5 AM 12/12 | 7.02 | 0.015 |
| 6 AM 12/12 | 7.02 | 0.015 |
| 7 AM 12/12 | 7.02 | 0.015 |
| 8 AM 12/12 | 7.02 | 0.015 |
| 9 AM 12/12 | 7.02 | 0.015 |
| 10 AM 12/12 | 7.02 | 0.015 |
| 11 AM 12/12 | 7.02 | 0.015 |
| 12 PM 12/12 | 7.02 | 0.015 |
| 1 PM 12/12 | 7.02 | 0.015 |
| 2 PM 12/12 | 7.02 | 0.015 |
| 3 PM 12/12 | 7.02 | 0.015 |
| 4 PM 12/12 | 7.02 | 0.015 |
| 5 PM 12/12 | 7.02 | 0.015 |
| 6 PM 12/12 | 7.02 | 0.015 |
| 7 PM 12/12 | 7.02 | 0.015 |
| 8 PM 12/12 | 7.02 | 0.015 |
| 9 PM 12/12 | 7.02 | 0.015 |
| 10 PM 12/12 | 7.02 | 0.015 |
| 11 PM 12/12 | 7.02 | 0.015 |
| 12 AM 12/13 | 7.02 | 0.015 |
| 1 AM 12/13 | 7.02 | 0.015 |
| 2 AM 12/13 | 7.02 | 0.015 |
| 3 AM 12/13 | 7.01 | 0.014 |
| 4 AM 12/13 | 7.01 | 0.014 |
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 6:15 PM 12/8 | 7.08 | 0.019 |
| 6:00 PM 12/8 | 7.09 | 0.02 |
| 5:45 PM 12/8 | 7.1 | 0.021 |
| 5:30 PM 12/8 | 7.08 | 0.019 |
| 5:15 PM 12/8 | 7.08 | 0.019 |
| 5:00 PM 12/8 | 7.07 | 0.018 |
| 4:45 PM 12/8 | 7.1 | 0.021 |
| 4:30 PM 12/8 | 7.11 | 0.021 |
| 4:15 PM 12/8 | 7.09 | 0.02 |
| 4:00 PM 12/8 | 7.09 | 0.02 |
| 3:45 PM 12/8 | 7.09 | 0.02 |
| 3:30 PM 12/8 | 7.09 | 0.02 |
| 3:15 PM 12/8 | 7.1 | 0.021 |
| 3:00 PM 12/8 | 7.12 | 0.022 |
| 2:45 PM 12/8 | 7.09 | 0.02 |
| 2:30 PM 12/8 | 7.06 | 0.017 |
| 2:15 PM 12/8 | 7.1 | 0.021 |
| 2:00 PM 12/8 | 7.09 | 0.02 |
| 1:45 PM 12/8 | 7.09 | 0.02 |
| 1:30 PM 12/8 | 7.08 | 0.019 |
| 1:15 PM 12/8 | 7.09 | 0.02 |
| 1:00 PM 12/8 | 7.09 | 0.02 |
| 12:45 PM 12/8 | 7.06 | 0.017 |
| 12:30 PM 12/8 | 7.09 | 0.02 |
| 12:15 PM 12/8 | 7.07 | 0.018 |
| 12:00 PM 12/8 | 7.08 | 0.019 |
| 11:45 AM 12/8 | 7.08 | 0.019 |
| 11:30 AM 12/8 | 7.08 | 0.019 |
| 11:15 AM 12/8 | 7.07 | 0.018 |
| 11:00 AM 12/8 | 7.06 | 0.017 |
16.29' -
Major flood, 37,000 cfs. Widespread inundation of Camp Pendleton with evacuations likely. Flood of Record Jan 16, 1993.
13.78' -
Moderate 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.
12.5' -
Minor flood stage, 8,000 cfs. Vandegrift Road has begun to flood downstream of the gage. Stuart Mesa Road closures can be expected.
10.85' -
2,500 cfs. The river has reached monitor stage. Personnel begin regular patrols along the levee.
| Date | Stage (ft) |
|---|---|
| Jan 16, 1993 | 20.47 |
| Feb 18, 1980 | 18.8 |
| Mar 1, 1978 | 18.12 |
| Feb 16, 1927 | 18 |
| Feb 25, 1969 | 15.89 |
| Feb 14, 2019 | 15.07 |
| Jan 22, 2017 | 14.6 |
| Jan 23, 1943 | 14.05 |
| Mar 3, 1938 | 12.7 |
| Jan 10, 1995 | 12.68 |
| Feb 23, 1998 | 12.41 |
| Jan 16, 2023 | 11.73 |
| Mar 1, 1991 | 11.2 |
| Feb 7, 1937 | 10.5 |
| Mar 2, 1983 | 10.4 |
Data provided by the National Weather Service.
