USGS Streamgage 11092450
Los Angeles River A Sepulveda Dam, CA
Los Angeles River A Sepulveda Dam, CA is USGS streamgage 11092450 in California, monitoring river discharge in hydrologic subbasin 18070105. It drains a watershed of about 158 square miles. Discharge records at this site go back to 1930. Typical flow runs near 18.3 cfs in July and 24.4 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 158 sq mi
- Gauge elevation
- 655 ft
- Subbasin (HUC-8)
- 18070105
- Coordinates
- 34.16167, -118.46675
- USGS site number
- 11092450
- Records begin
- 1930-03-15 (96 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 84 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 | 4.8 | 40.1 | 238.3 | |
| February | 5.2 | 40.4 | 319.3 | |
| March | 5.7 | 37.4 | 212.4 | |
| April | 5.7 | 24.4 | 96.6 | |
| May | 5.4 | 14 | 74.2 | |
| June | 5.5 | 13.2 | 69.2 | |
| July | 6 | 18.3 | 66.2 | |
| August | 5.7 | 24 | 66.5 | |
| September | 4.4 | 20.8 | 67.8 | |
| October | 3.8 | 17.7 | 73.5 | |
| November | 3.8 | 14.7 | 111.2 | |
| December | 4.3 | 28.2 | 148.7 |
All values in cubic feet per second (cfs).
Common questions
- When does Los Angeles River A Sepulveda Dam, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 40.4 cfs, against 13.2 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 Los Angeles River A Sepulveda Dam, CA?
- It depends on the month. In January, half of days historically fall near 40.1 cfs, with the middle 80% of days between 4.8 and 238.3 cfs. The month-by-month table on this page gives the full range.
- How long has Los Angeles River A Sepulveda Dam, CA been measured?
- Discharge records at USGS site 11092450 begin in 1930, about 96 years, covering roughly 8,706 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Los Angeles River A Sepulveda Dam, CA?
- The gauge sits at 34.16167, -118.46675, in California, in hydrologic subbasin 18070105, at an elevation of about 655 feet, draining roughly 158 square miles.
- Can I use Los Angeles River A Sepulveda Dam, 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.