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| SANTA MARGARITA - YSIDORA (YDRC1) | ||||||||||||||||||
| Latitude: 33.31º N | Longitude: 117.35º W | Elevation: 75 Feet | ||||||||||||||||
| Location: San Diego County in CA | ||||||||||||||||||
| River Group: Southern California | ||||||||||||||||||
| Issuance Time: | Feb 19 2026 at 3:17 PM PST |
| Please Note: | Ensemble forecasts produced by CNRFC only consider meteorological uncertainty and do not account for hydrologic uncertainty. |
| 10-Day Accumulated Volume Plot |
| Tabular 10-Day Streamflow Volume Accumulation (1000s of Acre-Feet) Data Updated: Feb 19 2026 at 3:22 PM PST | ||||||||||
| Prob | Feb 20 | Feb 21 | Feb 22 | Feb 23 | Feb 24 | |||||
| 10% (Max) | 2.0 | 3.1 | 3.4 | 3.6 | 3.9 | |||||
| 25% | 1.0 | 1.6 | 1.8 | 1.9 | 2.0 | |||||
| 50% (Prob) | 0.5 | 1.0 | 1.1 | 1.2 | 1.2 | |||||
| 75% | 0.4 | 0.8 | 0.9 | 1.0 | 1.0 | |||||
| 90% (Min) | 0.2 | 0.5 | 0.6 | 0.6 | 0.7 | |||||
| RFC FCST | 0.8 | 1.4 | 1.5 | 1.6 | 1.7 | |||||
| Prob | Feb 25 | Feb 26 | Feb 27 | Feb 28 | Mar 01 | |||||
| 10% (Max) | 4.0 | 4.2 | 4.5 | 4.6 | 4.7 | |||||
| 25% | 2.1 | 2.3 | 2.6 | 2.7 | 3.0 | |||||
| 50% (Prob) | 1.3 | 1.4 | 1.5 | 1.5 | 1.6 | |||||
| 75% | 1.1 | 1.2 | 1.2 | 1.2 | 1.3 | |||||
| 90% (Min) | 0.7 | 0.8 | 0.8 | 0.9 | 0.9 | |||||
| Location Photographs | ||
| ESRI™ Locator Map |
| Flood Impacts | |
| 16.29 Feet | Major flood, 37,000 cfs. Widespread inundation of Camp Pendleton with evacuations likely. Flood of Record Jan 16, 1993. |
| 13.78 Feet | 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 Feet | 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 Feet | 2,500 cfs. The river has reached monitor stage. Personnel begin regular patrols along the levee. |