USGS Streamgage 11109000
Santa Clara River near Piru, CA
Santa Clara River near Piru, CA is USGS streamgage 11109000 in California, monitoring river discharge in hydrologic subbasin 18070102. It drains a watershed of about 645 square miles. Discharge records at this site go back to 1927. Typical flow runs near 22.2 cfs in July and 46.7 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.
View live conditions & forecast →
Gauge details
- State
- California
- Drainage area
- 645 sq mi
- Gauge elevation
- 715 ft
- Subbasin (HUC-8)
- 18070102
- Coordinates
- 34.40361, -118.73924
- USGS site number
- 11109000
- Records begin
- 1927-10-01 (99 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Santa Clara River near Piru, CA. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 37 | 38.6 | 40.3 | ||
| 36.1 | 38.2 | 40.5 | ||
| 35.3 | 37.9 | 40.5 | ||
| 34.6 | 37.7 | 40.7 | ||
| 34.2 | 37.7 | 41.4 | ||
| 33.7 | 37.7 | 41.9 | ||
| 32.7 | 37.4 | 41.6 | ||
| 32 | 37.2 | 41.8 | ||
| 31.9 | 37.3 | 42.5 | ||
| 31.7 | 37.5 | 43.7 | ||
| 31.3 | 37.6 | 44.2 | ||
| 31.4 | 37.9 | 45.3 | ||
| 31.9 | 38.9 | 49.4 | ||
| 30.8 | 38 | 46 |
All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 99 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 | 21.9 | 50.8 | 212.8 | |
| February | 24.8 | 59.7 | 388.2 | |
| March | 22.6 | 64.8 | 344.5 | |
| April | 12.7 | 46.7 | 178 | |
| May | 6.4 | 36 | 131 | |
| June | 2 | 30.6 | 93.9 | |
| July | 0.6 | 22.2 | 55.2 | |
| August | 0.3 | 19.3 | 45.3 | |
| September | 1.4 | 21.2 | 45.8 | |
| October | 4.6 | 27.3 | 54.7 | |
| November | 10.6 | 34.4 | 77.2 | |
| December | 17 | 43.5 | 125.8 |
All values in cubic feet per second (cfs).
Common questions
- When does Santa Clara River near Piru, CA normally run highest?
- March, on the long-term record. The median daily flow that month is about 64.8 cfs, against 19.3 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 Santa Clara River near Piru, CA?
- It depends on the month. In January, half of days historically fall near 50.8 cfs, with the middle 80% of days between 21.9 and 212.8 cfs. The month-by-month table on this page gives the full range.
- How long has Santa Clara River near Piru, CA been measured?
- Discharge records at USGS site 11109000 begin in 1927, about 99 years, covering roughly 9,130 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Santa Clara River near Piru, CA?
- Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
- Where is Santa Clara River near Piru, CA?
- The gauge sits at 34.40361, -118.73924, in California, in hydrologic subbasin 18070102, at an elevation of about 715 feet, draining roughly 645 square miles.
- Can I use Santa Clara River near Piru, 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.