USGS Streamgage 11180700
Alameda C Flood Channel A Union City, CA
Alameda C Flood Channel A Union City, CA is USGS streamgage 11180700 in California, monitoring river discharge in hydrologic subbasin 18050004. Discharge records at this site go back to 1958. Typical flow runs near 0.1 cfs in July and 8.8 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Gauge elevation
- 7 ft
- Subbasin (HUC-8)
- 18050004
- Coordinates
- 37.58577, -122.0483
- USGS site number
- 11180700
- Records begin
- 1958-10-01 (68 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 68 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 | 8.5 | 741.5 | |
| February | 0.1 | 18 | 1,139.5 | |
| March | 0 | 20.5 | 803.7 | |
| April | 0 | 8.8 | 328.1 | |
| May | 0 | 3.2 | 81.8 | |
| June | 0 | 1.4 | 32.1 | |
| July | 0 | 0.1 | 14.8 | |
| August | 0 | 0 | 13.1 | |
| September | 0 | 0 | 13.7 | |
| October | 0 | 0.1 | 15 | |
| November | 0 | 0.7 | 55.8 | |
| December | 0 | 2.4 | 263.4 |
All values in cubic feet per second (cfs).
Common questions
- When does Alameda C Flood Channel A Union City, CA normally run highest?
- March, on the long-term record. The median daily flow that month is about 20.5 cfs, against 0 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 Alameda C Flood Channel A Union City, CA?
- It depends on the month. In January, half of days historically fall near 8.5 cfs, with the middle 80% of days between 0 and 741.5 cfs. The month-by-month table on this page gives the full range.
- How long has Alameda C Flood Channel A Union City, CA been measured?
- Discharge records at USGS site 11180700 begin in 1958, about 68 years, covering roughly 9,125 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Alameda C Flood Channel A Union City, CA?
- The gauge sits at 37.58577, -122.0483, in California, in hydrologic subbasin 18050004, at an elevation of about 7 feet.
- Can I use Alameda C Flood Channel A Union City, 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.