USGS Streamgage 11044350
Sandia C near Fallbrook, CA
Sandia C near Fallbrook, CA is USGS streamgage 11044350 in California, monitoring river discharge in hydrologic subbasin 18070302. It drains a watershed of about 21 square miles. Discharge records at this site go back to 1989. Typical flow runs near 1.9 cfs in July and 5.9 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 21 sq mi
- Gauge elevation
- 383 ft
- Subbasin (HUC-8)
- 18070302
- Coordinates
- 33.42448, -117.24919
- USGS site number
- 11044350
- 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 | 2.5 | 4.8 | 42.3 | |
| February | 2.9 | 7.3 | 50.8 | |
| March | 2.9 | 8.5 | 35 | |
| April | 2.1 | 5.9 | 21.6 | |
| May | 1.6 | 4.5 | 12.4 | |
| June | 1 | 3 | 8.5 | |
| July | 0.4 | 1.9 | 4.8 | |
| August | 0.2 | 1.5 | 3.3 | |
| September | 0.4 | 1.2 | 3.7 | |
| October | 0.8 | 1.6 | 3.9 | |
| November | 1.2 | 2.3 | 5.7 | |
| December | 1.9 | 3.6 | 10.4 |
All values in cubic feet per second (cfs).
Common questions
- When does Sandia C near Fallbrook, CA normally run highest?
- March, on the long-term record. The median daily flow that month is about 8.5 cfs, against 1.2 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Sandia C near Fallbrook, CA?
- It depends on the month. In January, half of days historically fall near 4.8 cfs, with the middle 80% of days between 2.5 and 42.3 cfs. The month-by-month table on this page gives the full range.
- How long has Sandia C near Fallbrook, CA been measured?
- Discharge records at USGS site 11044350 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 Sandia C near Fallbrook, CA?
- The gauge sits at 33.42448, -117.24919, in California, in hydrologic subbasin 18070302, at an elevation of about 383 feet, draining roughly 21 square miles.
- Can I use Sandia C 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.