USGS Streamgage 11055000
Mill C near Mentone, CA
Mill C near Mentone, CA is USGS streamgage 11055000 in California, monitoring river discharge in hydrologic subbasin 18070203. It drains a watershed of about 49 square miles. Discharge records at this site go back to 1939. Typical flow runs near 0 cfs in July and 0.1 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 49 sq mi
- Gauge elevation
- 2,010 ft
- Subbasin (HUC-8)
- 18070203
- Coordinates
- 34.07779, -117.0992
- USGS site number
- 11055000
- Records begin
- 1939-02-01 (87 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 27 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 | 4.9 | |
| February | 0 | 0.1 | 9.5 | |
| March | 0 | 0 | 16.5 | |
| April | 0 | 0.1 | 27.9 | |
| May | 0 | 0 | 36.6 | |
| June | 0 | 0 | 8.8 | |
| July | 0 | 0 | 2.1 | |
| August | 0 | 0 | 1 | |
| September | 0 | 0 | 0.5 | |
| October | 0 | 0 | 0.7 | |
| November | 0 | 0 | 1.3 | |
| December | 0 | 0 | 2.7 |
All values in cubic feet per second (cfs).
Common questions
- When does Mill C near Mentone, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 0.1 cfs, against 0 cfs in January, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Mill C near Mentone, CA?
- It depends on the month. In January, half of days historically fall near 0 cfs, with the middle 80% of days between 0 and 4.9 cfs. The month-by-month table on this page gives the full range.
- How long has Mill C near Mentone, CA been measured?
- Discharge records at USGS site 11055000 begin in 1939, about 87 years. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Mill C near Mentone, CA?
- The gauge sits at 34.07779, -117.0992, in California, in hydrologic subbasin 18070203, at an elevation of about 2,010 feet, draining roughly 49 square miles.
- Can I use Mill C near Mentone, 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.