USGS Streamgage 11381500
Mill C near Los Molinos, CA
Mill C near Los Molinos, CA is USGS streamgage 11381500 in California, monitoring river discharge in hydrologic subbasin 18020156. It drains a watershed of about 131 square miles. Discharge records at this site go back to 1928. Typical flow runs near 148 cfs in July and 373.4 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 131 sq mi
- Gauge elevation
- 384 ft
- Subbasin (HUC-8)
- 18020156
- Coordinates
- 40.0546, -122.02415
- USGS site number
- 11381500
- Records begin
- 1928-10-01 (98 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 98 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 | 115.6 | 220.2 | 997.3 | |
| February | 137.6 | 281.8 | 1,043.1 | |
| March | 181.8 | 329.5 | 855.6 | |
| April | 215.9 | 373.4 | 717.2 | |
| May | 203.5 | 401.1 | 729.2 | |
| June | 135.4 | 289.4 | 574.3 | |
| July | 93.6 | 148 | 292.6 | |
| August | 78 | 109.7 | 163.5 | |
| September | 75.5 | 102.7 | 135.5 | |
| October | 80.2 | 106.5 | 153.4 | |
| November | 89.6 | 126.2 | 309.3 | |
| December | 99.3 | 158.9 | 813.2 |
All values in cubic feet per second (cfs).
Common questions
- When does Mill C near Los Molinos, CA normally run highest?
- May, on the long-term record. The median daily flow that month is about 401.1 cfs, against 102.7 cfs in September, 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 Los Molinos, CA?
- It depends on the month. In January, half of days historically fall near 220.2 cfs, with the middle 80% of days between 115.6 and 997.3 cfs. The month-by-month table on this page gives the full range.
- How long has Mill C near Los Molinos, CA been measured?
- Discharge records at USGS site 11381500 begin in 1928, about 98 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 Mill C near Los Molinos, CA?
- The gauge sits at 40.0546, -122.02415, in California, in hydrologic subbasin 18020156, at an elevation of about 384 feet, draining roughly 131 square miles.
- Can I use Mill C near Los Molinos, 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.