USGS Streamgage 11088500
Brea C below Brea Dam near Fullerton, CA
Brea C below Brea Dam near Fullerton, CA is USGS streamgage 11088500 in California, monitoring river discharge in hydrologic subbasin 18070106. It drains a watershed of about 22 square miles. Discharge records at this site go back to 1942. Typical flow runs near 0.2 cfs in July and 0.8 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
- 22 sq mi
- Gauge elevation
- 198 ft
- Subbasin (HUC-8)
- 18070106
- Coordinates
- 33.88779, -117.92644
- USGS site number
- 11088500
- Records begin
- 1942-01-01 (84 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Brea C below Brea Dam near Fullerton, 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 |
|---|---|---|---|---|
| 0.1 | 0.1 | 0.1 | ||
| 0 | 0.1 | 0.1 | ||
| 0 | 0.1 | 0.1 | ||
| 0 | 0.1 | 0.1 | ||
| 0 | 0.1 | 0.1 | ||
| 0 | 0.1 | 0.1 | ||
| 0 | 0.1 | 0.1 | ||
| 0 | 0.1 | 0.2 | ||
| 0 | 0.1 | 0.7 | ||
| 0 | 0.2 | 3.3 | ||
| 0 | 0.1 | 0.4 | ||
| 0 | 0.1 | 0.3 | ||
| 0 | 0.1 | 0.2 | ||
| 0 | 0.1 | 0.2 |
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 85 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 | 0.9 | 17 | |
| February | 0 | 1.2 | 29 | |
| March | 0 | 1.2 | 17.1 | |
| April | 0 | 0.8 | 5.6 | |
| May | 0 | 0.4 | 2.9 | |
| June | 0 | 0.2 | 1.9 | |
| July | 0 | 0.2 | 1.5 | |
| August | 0 | 0.2 | 1.4 | |
| September | 0 | 0.2 | 1.6 | |
| October | 0 | 0.2 | 2 | |
| November | 0 | 0.4 | 4.2 | |
| December | 0 | 0.7 | 9 |
All values in cubic feet per second (cfs).
Common questions
- When does Brea C below Brea Dam near Fullerton, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 1.2 cfs, against 0.2 cfs in June, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Brea C below Brea Dam near Fullerton, CA?
- It depends on the month. In January, half of days historically fall near 0.9 cfs, with the middle 80% of days between 0 and 17 cfs. The month-by-month table on this page gives the full range.
- How long has Brea C below Brea Dam near Fullerton, CA been measured?
- Discharge records at USGS site 11088500 begin in 1942, about 84 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 Brea C below Brea Dam near Fullerton, 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 Brea C below Brea Dam near Fullerton, CA?
- The gauge sits at 33.88779, -117.92644, in California, in hydrologic subbasin 18070106, at an elevation of about 198 feet, draining roughly 22 square miles.
- Can I use Brea C below Brea Dam near Fullerton, 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.