USGS Streamgage 11044300
Santa Margarita River A Fpud Sump near Fallbrook, CA
Santa Margarita River A Fpud Sump near Fallbrook, CA is USGS streamgage 11044300 in California, monitoring river discharge in hydrologic subbasin 18070302. It drains a watershed of about 620 square miles. Discharge records at this site go back to 1989. Typical flow runs near 4.4 cfs in July and 13.2 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 620 sq mi
- Gauge elevation
- 336 ft
- Subbasin (HUC-8)
- 18070302
- Coordinates
- 33.41364, -117.24114
- USGS site number
- 11044300
- Records begin
- 1989-10-01 (37 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 37 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 4.4 | 13.7 | 189 | |
| February | 5.7 | 16.1 | 307.6 | |
| March | 5.7 | 15.8 | 149.5 | |
| April | 6 | 13.2 | 50.3 | |
| May | 3.7 | 8.1 | 27.8 | |
| June | 2.9 | 6.5 | 16.7 | |
| July | 2.3 | 4.4 | 12.1 | |
| August | 2.2 | 4.1 | 10.1 | |
| September | 2.1 | 4.1 | 11 | |
| October | 2.8 | 5.2 | 13.4 | |
| November | 2.2 | 5.6 | 18.9 | |
| December | 2.6 | 7.2 | 58 |
All values in cubic feet per second (cfs).
Common questions
- When does Santa Margarita River A Fpud Sump near Fallbrook, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 16.1 cfs, against 4.1 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Santa Margarita River A Fpud Sump near Fallbrook, CA?
- It depends on the month. In January, half of days historically fall near 13.7 cfs, with the middle 80% of days between 4.4 and 189 cfs. The month-by-month table on this page gives the full range.
- How long has Santa Margarita River A Fpud Sump near Fallbrook, CA been measured?
- Discharge records at USGS site 11044300 begin in 1989, about 37 years, covering roughly 9,126 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Santa Margarita River A Fpud Sump near Fallbrook, CA?
- The gauge sits at 33.41364, -117.24114, in California, in hydrologic subbasin 18070302, at an elevation of about 336 feet, draining roughly 620 square miles.
- Can I use Santa Margarita River A Fpud Sump near Fallbrook, CA data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.