USGS Streamgage 11475500
SF Eel River near Branscomb, CA
SF Eel River near Branscomb, CA is USGS streamgage 11475500 in California, monitoring river discharge in hydrologic subbasin 18010106. It drains a watershed of about 44 square miles. Discharge records at this site go back to 1946. Typical flow runs near 5.6 cfs in July and 151.8 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 44 sq mi
- Gauge elevation
- 1,384 ft
- Subbasin (HUC-8)
- 18010106
- Coordinates
- 39.71904, -123.6528
- USGS site number
- 11475500
- Records begin
- 1946-10-01 (80 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 21 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 | — | 263.3 | — | |
| February | — | 591.1 | — | |
| March | — | 209 | — | |
| April | — | 151.8 | — | |
| May | — | 32.2 | — | |
| June | — | 15.2 | — | |
| July | — | 5.6 | — | |
| August | — | 1.2 | — | |
| September | — | 1 | — | |
| October | — | 3.9 | — | |
| November | — | 261.6 | — | |
| December | — | 705.5 | — |
All values in cubic feet per second (cfs).
Common questions
- When does SF Eel River near Branscomb, CA normally run highest?
- December, on the long-term record. The median daily flow that month is about 705.5 cfs, against 1 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- How long has SF Eel River near Branscomb, CA been measured?
- Discharge records at USGS site 11475500 begin in 1946, about 80 years, covering roughly 670 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is SF Eel River near Branscomb, CA?
- The gauge sits at 39.71904, -123.6528, in California, in hydrologic subbasin 18010106, at an elevation of about 1,384 feet, draining roughly 44 square miles.
- Can I use SF Eel River near Branscomb, 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.