USGS Streamgage 11374000
Cow C near Millville, CA
Cow C near Millville, CA is USGS streamgage 11374000 in California, monitoring river discharge in hydrologic subbasin 18020151. It drains a watershed of about 425 square miles. Discharge records at this site go back to 1937. Typical flow runs near 42.4 cfs in July and 568.8 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 425 sq mi
- Gauge elevation
- 388 ft
- Subbasin (HUC-8)
- 18020151
- Coordinates
- 40.50487, -122.23306
- USGS site number
- 11374000
- Records begin
- 1937-01-01 (89 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 77 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 | 145.4 | 636.1 | 4,518.4 | |
| February | 191.9 | 745.2 | 4,169.3 | |
| March | 240.1 | 807 | 3,201.9 | |
| April | 212 | 568.8 | 1,736.3 | |
| May | 121.5 | 361.7 | 1,017.1 | |
| June | 38 | 133.8 | 444 | |
| July | 10.4 | 42.4 | 132.4 | |
| August | 3.8 | 26.6 | 76.5 | |
| September | 9.4 | 36.2 | 78.2 | |
| October | 25.8 | 70.9 | 187.2 | |
| November | 69.6 | 143.7 | 955.6 | |
| December | 98.5 | 314.3 | 3,524.8 |
All values in cubic feet per second (cfs).
Common questions
- When does Cow C near Millville, CA normally run highest?
- March, on the long-term record. The median daily flow that month is about 807 cfs, against 26.6 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Cow C near Millville, CA?
- It depends on the month. In January, half of days historically fall near 636.1 cfs, with the middle 80% of days between 145.4 and 4,518.4 cfs. The month-by-month table on this page gives the full range.
- How long has Cow C near Millville, CA been measured?
- Discharge records at USGS site 11374000 begin in 1937, about 89 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 Cow C near Millville, CA?
- The gauge sits at 40.50487, -122.23306, in California, in hydrologic subbasin 18020151, at an elevation of about 388 feet, draining roughly 425 square miles.
- Can I use Cow C near Millville, 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.