USGS Streamgage 11467553
NF Gualala River Ab SF Gualala River near Gualala, CA
NF Gualala River Ab SF Gualala River near Gualala, CA is USGS streamgage 11467553 in California, monitoring river discharge in hydrologic subbasin 18010109. It drains a watershed of about 47 square miles. Discharge records at this site go back to 2000. Typical flow runs near 9.5 cfs in July and 89.4 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 47 sq mi
- Gauge elevation
- 27 ft
- Subbasin (HUC-8)
- 18010109
- Coordinates
- 38.78986, -123.50942
- USGS site number
- 11467553
- Records begin
- 2000-10-01 (26 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 26 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 | 11.2 | 96.4 | 506.6 | |
| February | 23.8 | 84 | 327.1 | |
| March | 17.2 | 105.9 | 525.3 | |
| April | 14.6 | 89.4 | 353.6 | |
| May | 9.9 | 33.2 | 102.6 | |
| June | 6.6 | 17 | 49.8 | |
| July | 3.8 | 9.5 | 20.5 | |
| August | 2.6 | 5.9 | 11.1 | |
| September | 2.1 | 4.5 | 7.4 | |
| October | 2 | 4.8 | 25.8 | |
| November | 3.8 | 10.7 | 98.3 | |
| December | 4.6 | 44.5 | 958 |
All values in cubic feet per second (cfs).
Common questions
- When does NF Gualala River Ab SF Gualala River near Gualala, CA normally run highest?
- March, on the long-term record. The median daily flow that month is about 105.9 cfs, against 4.5 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 NF Gualala River Ab SF Gualala River near Gualala, CA?
- It depends on the month. In January, half of days historically fall near 96.4 cfs, with the middle 80% of days between 11.2 and 506.6 cfs. The month-by-month table on this page gives the full range.
- How long has NF Gualala River Ab SF Gualala River near Gualala, CA been measured?
- Discharge records at USGS site 11467553 begin in 2000, about 26 years, covering roughly 6,671 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is NF Gualala River Ab SF Gualala River near Gualala, CA?
- The gauge sits at 38.78986, -123.50942, in California, in hydrologic subbasin 18010109, at an elevation of about 27 feet, draining roughly 47 square miles.
- Can I use NF Gualala River Ab SF Gualala River near Gualala, 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.