USGS Streamgage 11317000
MF Mokelumne River A West Point, CA
MF Mokelumne River A West Point, CA is USGS streamgage 11317000 in California, monitoring river discharge in hydrologic subbasin 18040012. It drains a watershed of about 68 square miles. Discharge records at this site go back to 1911. Typical flow runs near 12.4 cfs in July and 123.5 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 68 sq mi
- Gauge elevation
- 2,450 ft
- Subbasin (HUC-8)
- 18040012
- Coordinates
- 38.38963, -120.52659
- USGS site number
- 11317000
- Records begin
- 1911-10-01 (115 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 114 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 | 9.4 | 34.1 | 222.9 | |
| February | 16 | 70.4 | 264.3 | |
| March | 28.3 | 100.5 | 308.3 | |
| April | 31.8 | 123.5 | 305.6 | |
| May | 15.9 | 79.7 | 248.2 | |
| June | 7.3 | 34.5 | 95.4 | |
| July | 3.2 | 12.4 | 39.5 | |
| August | 1.6 | 6.5 | 22.3 | |
| September | 1.3 | 5.5 | 16.5 | |
| October | 2.8 | 7.3 | 24.5 | |
| November | 4.6 | 11.1 | 39.3 | |
| December | 6.5 | 16.9 | 103.5 |
All values in cubic feet per second (cfs).
Common questions
- When does MF Mokelumne River A West Point, CA normally run highest?
- April, on the long-term record. The median daily flow that month is about 123.5 cfs, against 5.5 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 MF Mokelumne River A West Point, CA?
- It depends on the month. In January, half of days historically fall near 34.1 cfs, with the middle 80% of days between 9.4 and 222.9 cfs. The month-by-month table on this page gives the full range.
- How long has MF Mokelumne River A West Point, CA been measured?
- Discharge records at USGS site 11317000 begin in 1911, about 115 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 MF Mokelumne River A West Point, CA?
- The gauge sits at 38.38963, -120.52659, in California, in hydrologic subbasin 18040012, at an elevation of about 2,450 feet, draining roughly 68 square miles.
- Can I use MF Mokelumne River A West Point, 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.