USGS Streamgage 11234760
San Joaquin River Ab Shakeflat C near Big Creek, CA
San Joaquin River Ab Shakeflat C near Big Creek, CA is USGS streamgage 11234760 in California, monitoring river discharge in hydrologic subbasin 18040006. It drains a watershed of about 1,003 square miles. Discharge records at this site go back to 1959. Typical flow runs near 35.5 cfs in July and 23.4 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- California
- Drainage area
- 1,003 sq mi
- Gauge elevation
- 2,866 ft
- Subbasin (HUC-8)
- 18040006
- Coordinates
- 37.31661, -119.32957
- USGS site number
- 11234760
- Records begin
- 1959-10-01 (67 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 66 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 | 11.2 | 14 | 102.6 | |
| February | 11.9 | 14.4 | 238.5 | |
| March | 11.9 | 14.6 | 605.2 | |
| April | 12.9 | 23.4 | 1,848.9 | |
| May | 14 | 119.9 | 5,927.4 | |
| June | 14 | 203.4 | 8,035.7 | |
| July | 14 | 35.5 | 3,799.7 | |
| August | 14 | 30.6 | 145.2 | |
| September | 14 | 28.5 | 46.2 | |
| October | 13.7 | 27.2 | 36.9 | |
| November | 11.1 | 13.4 | 31.8 | |
| December | 11 | 13.2 | 35.4 |
All values in cubic feet per second (cfs).
Common questions
- When does San Joaquin River Ab Shakeflat C near Big Creek, CA normally run highest?
- June, on the long-term record. The median daily flow that month is about 203.4 cfs, against 13.2 cfs in December, 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 Joaquin River Ab Shakeflat C near Big Creek, CA?
- It depends on the month. In January, half of days historically fall near 14 cfs, with the middle 80% of days between 11.2 and 102.6 cfs. The month-by-month table on this page gives the full range.
- How long has San Joaquin River Ab Shakeflat C near Big Creek, CA been measured?
- Discharge records at USGS site 11234760 begin in 1959, about 67 years, covering roughly 8,821 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is San Joaquin River Ab Shakeflat C near Big Creek, CA?
- The gauge sits at 37.31661, -119.32957, in California, in hydrologic subbasin 18040006, at an elevation of about 2,866 feet, draining roughly 1,003 square miles.
- Can I use San Joaquin River Ab Shakeflat C near Big Creek, 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.