USGS Streamgage 11274630
Del Puerto C near Patterson, CA
Del Puerto C near Patterson, CA is USGS streamgage 11274630 in California, monitoring river discharge in hydrologic subbasin 18040002. It drains a watershed of about 73 square miles. Discharge records at this site go back to 1959. Typical flow runs near 0 cfs in July and 2.9 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 73 sq mi
- Gauge elevation
- 199 ft
- Subbasin (HUC-8)
- 18040002
- Coordinates
- 37.48657, -121.20906
- USGS site number
- 11274630
- Records begin
- 1959-02-16 (67 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 | 0 | 2.4 | 46.1 | |
| February | 0.4 | 4.1 | 77.8 | |
| March | 0.4 | 5 | 51.5 | |
| April | 0.1 | 2.9 | 24 | |
| May | 0 | 0.8 | 9.5 | |
| June | 0 | 0.1 | 3.5 | |
| July | 0 | 0 | 0.4 | |
| August | 0 | 0 | 0 | |
| September | 0 | 0 | 0 | |
| October | 0 | 0 | 0.1 | |
| November | 0 | 0 | 1.6 | |
| December | 0 | 0.3 | 8.3 |
All values in cubic feet per second (cfs).
Common questions
- When does Del Puerto C near Patterson, CA normally run highest?
- March, on the long-term record. The median daily flow that month is about 5 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 Del Puerto C near Patterson, CA?
- It depends on the month. In January, half of days historically fall near 2.4 cfs, with the middle 80% of days between 0 and 46.1 cfs. The month-by-month table on this page gives the full range.
- How long has Del Puerto C near Patterson, CA been measured?
- Discharge records at USGS site 11274630 begin in 1959, about 67 years, covering roughly 9,125 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Del Puerto C near Patterson, CA?
- The gauge sits at 37.48657, -121.20906, in California, in hydrologic subbasin 18040002, at an elevation of about 199 feet, draining roughly 73 square miles.
- Can I use Del Puerto C near Patterson, 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.