USGS Streamgage 11458600
Nathanson C A Sonoma, CA
Nathanson C A Sonoma, CA is USGS streamgage 11458600 in California, monitoring river discharge in hydrologic subbasin 18050002. It drains a watershed of about 5 square miles. Discharge records at this site go back to 2016.
Gauge details
- State
- California
- Drainage area
- 5 sq mi
- Gauge elevation
- 55 ft
- Subbasin (HUC-8)
- 18050002
- Coordinates
- 38.28083, -122.45583
- USGS site number
- 11458600
- Records begin
- 2016-10-14 (10 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 10 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
Only 9 of 12 months have enough record to summarize; the rest are omitted.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 0.1 | 3.3 | 67.9 | |
| February | 0.2 | 2.5 | 97.1 | |
| March | 0.1 | 1.8 | 29.7 | |
| April | 0.1 | 0.7 | 10.6 | |
| May | — | 0.7 | — | |
| September | — | 0 | — | |
| October | 0 | 0 | 12 | |
| November | 0 | 0.1 | 15.4 | |
| December | 0 | 1.5 | 38.8 |
All values in cubic feet per second (cfs).
Common questions
- When does Nathanson C A Sonoma, CA normally run highest?
- January, on the long-term record. The median daily flow that month is about 3.3 cfs, against 0 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 Nathanson C A Sonoma, CA?
- It depends on the month. In January, half of days historically fall near 3.3 cfs, with the middle 80% of days between 0.1 and 67.9 cfs. The month-by-month table on this page gives the full range.
- How long has Nathanson C A Sonoma, CA been measured?
- Discharge records at USGS site 11458600 begin in 2016, about 10 years, covering roughly 2,109 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Nathanson C A Sonoma, CA?
- The gauge sits at 38.28083, -122.45583, in California, in hydrologic subbasin 18050002, at an elevation of about 55 feet, draining roughly 5 square miles.
- Can I use Nathanson C A Sonoma, 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.