Santa Margarita River at Ysidora CA
USGS Site No: 11046000 • Santa Margarita River • San Diego County, CA
Santa Margarita River at Ysidora CA on the Santa Margarita River is currently at 0 cfs (Normal — 0th percentile for this date) . Gage height: 7.04 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for June 11 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.
| Percentile | Label | CFS Threshold | Today's Flow |
|---|---|---|---|
| 10th | Very Low threshold | 0 | Today: 0 cfs |
| 25th | Low threshold | 0 | |
| 50th (Median) | Normal (median) | 7 | |
| 75th | High threshold | 14 | |
| 95th | Very High threshold | 44 |
30-Day Hydrograph
Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.
30-Day Flow History
| Date | Discharge (CFS) | Gage Ht (ft) |
|---|---|---|
| May 28, 2026 | 0 | — |
| May 27, 2026 | 0 | — |
| May 26, 2026 | 0 | — |
| May 25, 2026 | 0 | — |
| May 24, 2026 | 0 | — |
| May 23, 2026 | 0 | — |
| May 22, 2026 | 0 | — |
| May 21, 2026 | 0 | — |
| May 20, 2026 | 0 | — |
| May 19, 2026 | 0 | — |
| May 18, 2026 | 0 | — |
| May 17, 2026 | 0 | — |
| May 16, 2026 | 0 | — |
| May 15, 2026 | 0 | — |
| Apr 20, 2026 | 5 | — |
| Apr 19, 2026 | 5 | — |
| Apr 18, 2026 | 6 | — |
| Apr 17, 2026 | 6 | — |
| Apr 16, 2026 | 7 | — |
| Apr 15, 2026 | 7 | — |
| Apr 14, 2026 | 7 | — |
| Apr 13, 2026 | 6 | — |
| Apr 12, 2026 | 5 | — |
| Apr 11, 2026 | 4 | — |
| Apr 10, 2026 | 6 | — |
| Apr 9, 2026 | 5 | — |
| Apr 8, 2026 | 5 | — |
| Apr 7, 2026 | 4 | — |
| Apr 6, 2026 | 4 | — |
| Apr 5, 2026 | 4 | — |
Station Information
- USGS Site No
- 11046000
- State
- CA
- County
- San Diego County
- Coordinates
- 33.3111, -117.3473
- Drainage Area
- 723 mi²
- Datum (ft)
- 70.4
- HUC Code
- 18070302
Flood Stage Thresholds
- Action Stage
- 10.9 ft
- Flood Stage
- 12.5 ft
- Moderate Flood
- 13.8 ft
- Major Flood
- 16.3 ft
Currently 5.46 ft below flood stage.
Recent Extremes
- Max discharge
-
456 cfsJan 1, 2026
- Min discharge
-
0 cfsMay 28, 2026
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
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Oneill Lake Outlet Ch near Fallbrook CANormal1.6 mi · 0 cfs
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Oneill Lake Spill Ch near Fallbrook CANormal1.7 mi · 0 cfs
-
Fallbrook C near Fallbrook CANormal3.0 mi · 0 cfs
-
San Luis Rey River at Oceanside CANormal6.5 mi · 2 cfs
-
DE Luz C near DE Luz CANormal7.6 mi · 0 cfs