USGS Streamgage 11475800
SF Eel River A Leggett, CA
SF Eel River A Leggett, CA is USGS streamgage 11475800 in California, monitoring river discharge in hydrologic subbasin 18010106. It drains a watershed of about 248 square miles. Discharge records at this site go back to 1964. Typical flow runs near 43.1 cfs in July and 507.5 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 248 sq mi
- Gauge elevation
- 688 ft
- Subbasin (HUC-8)
- 18010106
- Coordinates
- 39.8746, -123.72058
- USGS site number
- 11475800
- Records begin
- 1964-12-22 (62 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 61 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 | 157.7 | 967.6 | 5,815.8 | |
| February | 201 | 1,112.6 | 5,432.8 | |
| March | 255.3 | 978.5 | 3,917.4 | |
| April | 170.5 | 507.5 | 1,780.6 | |
| May | 96.5 | 207 | 544.1 | |
| June | 47.9 | 96.3 | 191.4 | |
| July | 23.4 | 43.1 | 82.5 | |
| August | 13.4 | 24 | 41.3 | |
| September | 11.5 | 19.6 | 37.8 | |
| October | 13.2 | 26.2 | 155.3 | |
| November | 28.9 | 108.5 | 1,574.9 | |
| December | 58.8 | 575.9 | 4,507.4 |
All values in cubic feet per second (cfs).
Common questions
- When does SF Eel River A Leggett, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 1,112.6 cfs, against 19.6 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 SF Eel River A Leggett, CA?
- It depends on the month. In January, half of days historically fall near 967.6 cfs, with the middle 80% of days between 157.7 and 5,815.8 cfs. The month-by-month table on this page gives the full range.
- How long has SF Eel River A Leggett, CA been measured?
- Discharge records at USGS site 11475800 begin in 1964, about 62 years, covering roughly 8,122 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is SF Eel River A Leggett, CA?
- The gauge sits at 39.8746, -123.72058, in California, in hydrologic subbasin 18010106, at an elevation of about 688 feet, draining roughly 248 square miles.
- Can I use SF Eel River A Leggett, 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.