USGS Streamgage 11027000
Guejito C near San Pasqual, CA
Guejito C near San Pasqual, CA is USGS streamgage 11027000 in California, monitoring river discharge in hydrologic subbasin 18070304. It drains a watershed of about 23 square miles. Discharge records at this site go back to 1946. Typical flow runs near 0 cfs in July and 0.4 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 23 sq mi
- Gauge elevation
- 568 ft
- Subbasin (HUC-8)
- 18070304
- Coordinates
- 33.11587, -116.95307
- USGS site number
- 11027000
- Records begin
- 1946-12-28 (80 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 80 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 | 0 | 0.4 | 6.1 | |
| February | 0 | 0.7 | 11.3 | |
| March | 0 | 0.7 | 16.1 | |
| April | 0 | 0.4 | 8.1 | |
| May | 0 | 0.2 | 2.6 | |
| June | 0 | 0.1 | 1.2 | |
| July | 0 | 0 | 0.4 | |
| August | 0 | 0 | 0.1 | |
| September | 0 | 0 | 0.1 | |
| October | 0 | 0 | 0.2 | |
| November | 0 | 0 | 0.7 | |
| December | 0 | 0.1 | 1.6 |
All values in cubic feet per second (cfs).
Common questions
- When does Guejito C near San Pasqual, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 0.7 cfs, against 0 cfs in July, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Guejito C near San Pasqual, CA?
- It depends on the month. In January, half of days historically fall near 0.4 cfs, with the middle 80% of days between 0 and 6.1 cfs. The month-by-month table on this page gives the full range.
- How long has Guejito C near San Pasqual, CA been measured?
- Discharge records at USGS site 11027000 begin in 1946, about 80 years, covering roughly 7,975 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Guejito C near San Pasqual, CA?
- The gauge sits at 33.11587, -116.95307, in California, in hydrologic subbasin 18070304, at an elevation of about 568 feet, draining roughly 23 square miles.
- Can I use Guejito C near San Pasqual, 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.