USGS Streamgage 11157500
Tres Pinos C near Tres Pinos, CA
Tres Pinos C near Tres Pinos, CA is USGS streamgage 11157500 in California, monitoring river discharge in hydrologic subbasin 18060002. It drains a watershed of about 208 square miles. Discharge records at this site go back to 1922. Typical flow runs near 2.3 cfs in July and 2.5 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 208 sq mi
- Gauge elevation
- 514 ft
- Subbasin (HUC-8)
- 18060002
- Coordinates
- 36.76575, -121.29961
- USGS site number
- 11157500
- Records begin
- 1922-12-08 (104 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 104 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 | 2.5 | 65.8 | |
| February | 0.1 | 3.3 | 120.5 | |
| March | 0.3 | 3.7 | 80 | |
| April | 0 | 2.5 | 34.6 | |
| May | 0 | 2.2 | 11 | |
| June | 0 | 2.1 | 11.8 | |
| July | 0 | 2.3 | 10.7 | |
| August | 0 | 1.7 | 10.4 | |
| September | 0 | 1.3 | 8.5 | |
| October | 0 | 1.2 | 5.7 | |
| November | 0 | 1.5 | 5.2 | |
| December | 0 | 1.8 | 13.9 |
All values in cubic feet per second (cfs).
Common questions
- When does Tres Pinos C near Tres Pinos, CA normally run highest?
- March, on the long-term record. The median daily flow that month is about 3.7 cfs, against 1.2 cfs in October, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Tres Pinos C near Tres Pinos, CA?
- It depends on the month. In January, half of days historically fall near 2.5 cfs, with the middle 80% of days between 0 and 65.8 cfs. The month-by-month table on this page gives the full range.
- How long has Tres Pinos C near Tres Pinos, CA been measured?
- Discharge records at USGS site 11157500 begin in 1922, about 104 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 Tres Pinos C near Tres Pinos, CA?
- The gauge sits at 36.76575, -121.29961, in California, in hydrologic subbasin 18060002, at an elevation of about 514 feet, draining roughly 208 square miles.
- Can I use Tres Pinos C near Tres Pinos, 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.