USGS Streamgage 11022830
Alvarado C near La Mesa, CA
Alvarado C near La Mesa, CA is USGS streamgage 11022830 in California, monitoring river discharge in hydrologic subbasin 18070304. It drains a watershed of about 11 square miles. Discharge records at this site go back to 2024. Typical flow runs near 0.6 cfs in July and 0.9 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 11 sq mi
- Gauge elevation
- 320 ft
- Subbasin (HUC-8)
- 18070304
- Coordinates
- 32.77833, -117.0634
- USGS site number
- 11022830
- Records begin
- 2024-08-15 (2 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 2 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 | — | 5.6 | — | |
| February | — | 6.2 | — | |
| March | — | 4.6 | — | |
| April | — | 0.9 | — | |
| May | — | 1.1 | — | |
| June | — | 0.8 | — | |
| July | — | 0.6 | — | |
| August | — | 0.6 | — | |
| September | — | 0.9 | — | |
| October | — | 1.1 | — | |
| November | — | 3.5 | — | |
| December | — | 2.3 | — |
All values in cubic feet per second (cfs).
Common questions
- When does Alvarado C near La Mesa, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 6.2 cfs, against 0.6 cfs in July, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- How long has Alvarado C near La Mesa, CA been measured?
- Discharge records at USGS site 11022830 begin in 2024, about 2 years, covering roughly 716 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Alvarado C near La Mesa, CA?
- The gauge sits at 32.77833, -117.0634, in California, in hydrologic subbasin 18070304, at an elevation of about 320 feet, draining roughly 11 square miles.
- Can I use Alvarado C near La Mesa, 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.