USGS Streamgage 11401920
Spanish C A Quincy, CA
Spanish C A Quincy, CA is USGS streamgage 11401920 in California, monitoring river discharge in hydrologic subbasin 18020122. It drains a watershed of about 80 square miles. Discharge records at this site go back to 2009. Typical flow runs near 17.7 cfs in July and 235.7 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 80 sq mi
- Gauge elevation
- 3,394 ft
- Subbasin (HUC-8)
- 18020122
- Coordinates
- 39.94583, -120.9425
- USGS site number
- 11401920
- Records begin
- 2009-11-10 (17 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 17 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 | 24.5 | 101 | 671.8 | |
| February | 41.4 | 117.3 | 1,141.1 | |
| March | 52 | 236.9 | 943.4 | |
| April | 64.8 | 235.7 | 778.3 | |
| May | 26.3 | 112.6 | 434.5 | |
| June | 9.3 | 38.3 | 206.5 | |
| July | 4.2 | 17.7 | 56.7 | |
| August | 3.2 | 9.9 | 26.4 | |
| September | 3.7 | 10.3 | 23.5 | |
| October | 7.2 | 16.8 | 63.5 | |
| November | 15.6 | 26.5 | 137.4 | |
| December | 20.8 | 57.6 | 509.1 |
All values in cubic feet per second (cfs).
Common questions
- When does Spanish C A Quincy, CA normally run highest?
- March, on the long-term record. The median daily flow that month is about 236.9 cfs, against 9.9 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 Spanish C A Quincy, CA?
- It depends on the month. In January, half of days historically fall near 101 cfs, with the middle 80% of days between 24.5 and 671.8 cfs. The month-by-month table on this page gives the full range.
- How long has Spanish C A Quincy, CA been measured?
- Discharge records at USGS site 11401920 begin in 2009, about 17 years, covering roughly 6,108 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Spanish C A Quincy, CA?
- The gauge sits at 39.94583, -120.9425, in California, in hydrologic subbasin 18020122, at an elevation of about 3,394 feet, draining roughly 80 square miles.
- Can I use Spanish C A Quincy, 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.