USGS Streamgage 10251335
Willow Creek at China Ranch, CA
Willow Creek at China Ranch, CA is USGS streamgage 10251335 in California, monitoring river discharge in hydrologic subbasin 18090202. It drains a watershed of about 35 square miles. Discharge records at this site go back to 2013. Typical flow runs near 0.1 cfs in July and 0.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 35 sq mi
- Gauge elevation
- 1,237 ft
- Subbasin (HUC-8)
- 18090202
- Coordinates
- 35.80094, -116.19442
- USGS site number
- 10251335
- Records begin
- 2013-02-20 (13 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 14 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 | 0.1 | 0.2 | 0.4 | |
| February | 0.2 | 0.3 | 0.5 | |
| March | 0.2 | 0.3 | 0.4 | |
| April | 0.1 | 0.3 | 0.3 | |
| May | 0.1 | 0.2 | 0.2 | |
| June | 0 | 0.1 | 0.2 | |
| July | 0 | 0.1 | 0.1 | |
| August | 0 | 0.1 | 0.2 | |
| September | 0 | 0.1 | 0.2 | |
| October | 0 | 0.1 | 0.1 | |
| November | 0 | 0.1 | 0.2 | |
| December | 0.1 | 0.1 | 0.2 |
All values in cubic feet per second (cfs).
Common questions
- When does Willow Creek at China Ranch, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 0.3 cfs, against 0.1 cfs in June, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Willow Creek at China Ranch, CA?
- It depends on the month. In January, half of days historically fall near 0.2 cfs, with the middle 80% of days between 0.1 and 0.4 cfs. The month-by-month table on this page gives the full range.
- How long has Willow Creek at China Ranch, CA been measured?
- Discharge records at USGS site 10251335 begin in 2013, about 13 years, covering roughly 4,730 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Willow Creek at China Ranch, CA?
- The gauge sits at 35.80094, -116.19442, in California, in hydrologic subbasin 18090202, at an elevation of about 1,237 feet, draining roughly 35 square miles.
- Can I use Willow Creek at China Ranch, 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.