USGS Streamgage 11169025
Guadalupe River above Hwy 101 A San Jose, CA
Guadalupe River above Hwy 101 A San Jose, CA is USGS streamgage 11169025 in California, monitoring river discharge in hydrologic subbasin 18050003. It drains a watershed of about 160 square miles. Discharge records at this site go back to 2002. Typical flow runs near 28.7 cfs in July and 45.1 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 160 sq mi
- Gauge elevation
- 18 ft
- Subbasin (HUC-8)
- 18050003
- Coordinates
- 37.37383, -121.93301
- USGS site number
- 11169025
- Records begin
- 2002-05-23 (24 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 24 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 | 17.2 | 42.6 | 734 | |
| February | 14.6 | 51.9 | 650.8 | |
| March | 16.6 | 52 | 576.2 | |
| April | 15.9 | 45.1 | 262.9 | |
| May | 13.8 | 35.1 | 79.4 | |
| June | 12 | 30.8 | 47.8 | |
| July | 10.8 | 28.7 | 40.9 | |
| August | 9.6 | 25.1 | 38.5 | |
| September | 9.1 | 26.7 | 40.8 | |
| October | 8.7 | 27.5 | 58.5 | |
| November | 11.6 | 28.6 | 104.5 | |
| December | 18.1 | 38.8 | 325.7 |
All values in cubic feet per second (cfs).
Common questions
- When does Guadalupe River above Hwy 101 A San Jose, CA normally run highest?
- March, on the long-term record. The median daily flow that month is about 52 cfs, against 25.1 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Guadalupe River above Hwy 101 A San Jose, CA?
- It depends on the month. In January, half of days historically fall near 42.6 cfs, with the middle 80% of days between 17.2 and 734 cfs. The month-by-month table on this page gives the full range.
- How long has Guadalupe River above Hwy 101 A San Jose, CA been measured?
- Discharge records at USGS site 11169025 begin in 2002, about 24 years, covering roughly 8,837 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Guadalupe River above Hwy 101 A San Jose, CA?
- The gauge sits at 37.37383, -121.93301, in California, in hydrologic subbasin 18050003, at an elevation of about 18 feet, draining roughly 160 square miles.
- Can I use Guadalupe River above Hwy 101 A San Jose, 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.