USGS Streamgage 11066460
Santa Ana River A Mwd Crossing, CA
Santa Ana River A Mwd Crossing, CA is USGS streamgage 11066460 in California, monitoring river discharge in hydrologic subbasin 18070203. It drains a watershed of about 852 square miles. Discharge records at this site go back to 1862. Typical flow runs near 43.2 cfs in July and 70.6 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
- 852 sq mi
- Gauge elevation
- 686 ft
- Subbasin (HUC-8)
- 18070203
- Coordinates
- 33.96847, -117.44822
- USGS site number
- 11066460
- Records begin
- 1862-01-22 (164 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Santa Ana River A Mwd Crossing, 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 |
|---|---|---|---|---|
| 30.9 | 31.7 | 32.6 | ||
| 30.5 | 31.7 | 33.3 | ||
| 30.1 | 31.6 | 33.7 | ||
| 29.8 | 31.6 | 33.9 | ||
| 29.7 | 31.7 | 34.5 | ||
| 29.6 | 31.9 | 35.5 | ||
| 29.6 | 32.2 | 36.3 | ||
| 29.3 | 32 | 35.7 | ||
| 29.6 | 32.9 | 39.2 | ||
| 29.2 | 32.9 | 39.3 | ||
| 28.9 | 32.5 | 37.7 | ||
| 28.6 | 32.1 | 36.9 | ||
| 28.5 | 31.9 | 36.4 | ||
| 28.2 | 31.7 | 36.1 |
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 27 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 | 40.8 | 78.5 | 406.2 | |
| February | 42.3 | 82.8 | 553.1 | |
| March | 43.7 | 80.6 | 367.5 | |
| April | 41 | 70.6 | 300.3 | |
| May | 36.5 | 56.1 | 162.6 | |
| June | 29.3 | 47.7 | 89.1 | |
| July | 26.3 | 43.2 | 83.6 | |
| August | 25 | 41.2 | 94.5 | |
| September | 27.2 | 46 | 82 | |
| October | 29.6 | 53.1 | 96.8 | |
| November | 34.3 | 60.2 | 124.8 | |
| December | 38.9 | 71.7 | 332.1 |
All values in cubic feet per second (cfs).
Common questions
- When does Santa Ana River A Mwd Crossing, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 82.8 cfs, against 41.2 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 Ana River A Mwd Crossing, CA?
- It depends on the month. In January, half of days historically fall near 78.5 cfs, with the middle 80% of days between 40.8 and 406.2 cfs. The month-by-month table on this page gives the full range.
- How long has Santa Ana River A Mwd Crossing, CA been measured?
- Discharge records at USGS site 11066460 begin in 1862, about 164 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 Ana River A Mwd Crossing, 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 Ana River A Mwd Crossing, CA?
- The gauge sits at 33.96847, -117.44822, in California, in hydrologic subbasin 18070203, at an elevation of about 686 feet, draining roughly 852 square miles.
- Can I use Santa Ana River A Mwd Crossing, 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.