USGS Streamgage 11069500
San Jacinto River near San Jacinto
San Jacinto River near San Jacinto is USGS streamgage 11069500 in California, monitoring river discharge in hydrologic subbasin 18070202. It drains a watershed of about 142 square miles. Discharge records at this site go back to 1920. Typical flow runs near 0 cfs in July and 10 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 142 sq mi
- Gauge elevation
- 1,925 ft
- Subbasin (HUC-8)
- 18070202
- Coordinates
- 33.73808, -116.83391
- USGS site number
- 11069500
- Records begin
- 1920-10-01 (106 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 106 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 | 2.1 | 42.8 | |
| February | 0 | 5.7 | 99 | |
| March | 0 | 11.2 | 159.4 | |
| April | 0 | 10 | 121.9 | |
| May | 0 | 1.1 | 70.4 | |
| June | 0 | 0.1 | 21.3 | |
| July | 0 | 0 | 2 | |
| August | 0 | 0 | 1.7 | |
| September | 0 | 0 | 1.2 | |
| October | 0 | 0 | 1.1 | |
| November | 0 | 0 | 3.6 | |
| December | 0 | 0.4 | 17.4 |
All values in cubic feet per second (cfs).
Common questions
- When does San Jacinto River near San Jacinto normally run highest?
- March, on the long-term record. The median daily flow that month is about 11.2 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 San Jacinto River near San Jacinto?
- It depends on the month. In January, half of days historically fall near 2.1 cfs, with the middle 80% of days between 0 and 42.8 cfs. The month-by-month table on this page gives the full range.
- How long has San Jacinto River near San Jacinto been measured?
- Discharge records at USGS site 11069500 begin in 1920, about 106 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 San Jacinto River near San Jacinto?
- The gauge sits at 33.73808, -116.83391, in California, in hydrologic subbasin 18070202, at an elevation of about 1,925 feet, draining roughly 142 square miles.
- Can I use San Jacinto River near San Jacinto 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.