USGS Streamgage 11162753
San Mateo C below Lo Crystal Sp Reservoir near San Mateo, CA
San Mateo C below Lo Crystal Sp Reservoir near San Mateo, CA is USGS streamgage 11162753 in California, monitoring river discharge in hydrologic subbasin 18050004. It drains a watershed of about 30 square miles. Discharge records at this site go back to 2008. Typical flow runs near 3.3 cfs in July and 5.8 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 30 sq mi
- Gauge elevation
- 146 ft
- Subbasin (HUC-8)
- 18050004
- Coordinates
- 37.52944, -122.35833
- USGS site number
- 11162753
- Records begin
- 2008-09-11 (18 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 18 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 | 12.9 | 167.7 | |
| February | 1 | 17.2 | 104.8 | |
| March | 1.1 | 14.2 | 49.4 | |
| April | 1 | 5.8 | 51.6 | |
| May | 0.7 | 3.4 | 5.5 | |
| June | 0.6 | 3.4 | 4.8 | |
| July | 0.7 | 3.3 | 5.6 | |
| August | 0.7 | 3.3 | 4.6 | |
| September | 0.6 | 3.3 | 4.5 | |
| October | 0.6 | 3.3 | 4.5 | |
| November | 0.7 | 3.3 | 5 | |
| December | 0.8 | 4.8 | 21.5 |
All values in cubic feet per second (cfs).
Common questions
- When does San Mateo C below Lo Crystal Sp Reservoir near San Mateo, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 17.2 cfs, against 3.3 cfs in July, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for San Mateo C below Lo Crystal Sp Reservoir near San Mateo, CA?
- It depends on the month. In January, half of days historically fall near 12.9 cfs, with the middle 80% of days between 0.8 and 167.7 cfs. The month-by-month table on this page gives the full range.
- How long has San Mateo C below Lo Crystal Sp Reservoir near San Mateo, CA been measured?
- Discharge records at USGS site 11162753 begin in 2008, about 18 years, covering roughly 6,534 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is San Mateo C below Lo Crystal Sp Reservoir near San Mateo, CA?
- The gauge sits at 37.52944, -122.35833, in California, in hydrologic subbasin 18050004, at an elevation of about 146 feet, draining roughly 30 square miles.
- Can I use San Mateo C below Lo Crystal Sp Reservoir near San Mateo, 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.