USGS Streamgage 11372000
Clear C near Igo, CA
Clear C near Igo, CA is USGS streamgage 11372000 in California, monitoring river discharge in hydrologic subbasin 18020154. It drains a watershed of about 228 square miles. Discharge records at this site go back to 1940. Typical flow runs near 62.8 cfs in July and 195.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 228 sq mi
- Gauge elevation
- 676 ft
- Subbasin (HUC-8)
- 18020154
- Coordinates
- 40.51321, -122.52418
- USGS site number
- 11372000
- Records begin
- 1940-10-01 (86 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 62 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 | 58.8 | 221.8 | 593.8 | |
| February | 71.6 | 232.6 | 785 | |
| March | 72.2 | 228.9 | 628.2 | |
| April | 68.8 | 195.3 | 381 | |
| May | 58.3 | 125.6 | 300.4 | |
| June | 52.7 | 84.4 | 238.8 | |
| July | 48.5 | 62.8 | 164.8 | |
| August | 47.5 | 58.7 | 164.3 | |
| September | 47.2 | 57.7 | 199.9 | |
| October | 48.4 | 116.7 | 241.1 | |
| November | 92.1 | 178.8 | 276.6 | |
| December | 98.9 | 208.3 | 428.2 |
All values in cubic feet per second (cfs).
Common questions
- When does Clear C near Igo, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 232.6 cfs, against 57.7 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Clear C near Igo, CA?
- It depends on the month. In January, half of days historically fall near 221.8 cfs, with the middle 80% of days between 58.8 and 593.8 cfs. The month-by-month table on this page gives the full range.
- How long has Clear C near Igo, CA been measured?
- Discharge records at USGS site 11372000 begin in 1940, about 86 years, covering roughly 9,126 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Clear C near Igo, CA?
- The gauge sits at 40.51321, -122.52418, in California, in hydrologic subbasin 18020154, at an elevation of about 676 feet, draining roughly 228 square miles.
- Can I use Clear C near Igo, 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.