USGS Streamgage 11148900
Nacimiento River below Sapaque C near Bryson, CA
Nacimiento River below Sapaque C near Bryson, CA is USGS streamgage 11148900 in California, monitoring river discharge in hydrologic subbasin 18060005. It drains a watershed of about 162 square miles. Discharge records at this site go back to 1971. Typical flow runs near 0 cfs in July and 64.5 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 162 sq mi
- Gauge elevation
- 812 ft
- Subbasin (HUC-8)
- 18060005
- Coordinates
- 35.78858, -121.0938
- USGS site number
- 11148900
- Records begin
- 1971-09-16 (55 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 55 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 | 6.2 | 81.5 | 1,428.8 | |
| February | 13.9 | 127.6 | 1,917.5 | |
| March | 19.6 | 165.1 | 1,100.8 | |
| April | 9.8 | 64.5 | 345.7 | |
| May | 2.9 | 19.6 | 91.5 | |
| June | 0.1 | 3.2 | 25.9 | |
| July | 0 | 0 | 5.9 | |
| August | 0 | 0 | 0.2 | |
| September | 0 | 0 | 0 | |
| October | 0 | 0 | 1 | |
| November | 0 | 0.2 | 63.8 | |
| December | 0.2 | 21.3 | 484.6 |
All values in cubic feet per second (cfs).
Common questions
- When does Nacimiento River below Sapaque C near Bryson, CA normally run highest?
- March, on the long-term record. The median daily flow that month is about 165.1 cfs, against 0 cfs in July, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Nacimiento River below Sapaque C near Bryson, CA?
- It depends on the month. In January, half of days historically fall near 81.5 cfs, with the middle 80% of days between 6.2 and 1,428.8 cfs. The month-by-month table on this page gives the full range.
- How long has Nacimiento River below Sapaque C near Bryson, CA been measured?
- Discharge records at USGS site 11148900 begin in 1971, about 55 years, covering roughly 9,126 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Nacimiento River below Sapaque C near Bryson, CA?
- The gauge sits at 35.78858, -121.0938, in California, in hydrologic subbasin 18060005, at an elevation of about 812 feet, draining roughly 162 square miles.
- Can I use Nacimiento River below Sapaque C near Bryson, 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.