2 USGS Streamgages · New York Slough system
Nf Mokelumne River flows and levels
Nf Mokelumne River is gauged at 2 USGS streamgages in California, each tracked by Rivermatics. It feeds the South Mokelumne River. It drains into the New York Slough system. Drainage area at the gauges ranges from 170 square miles at NF Mokelumne River below Salt Springs Dam, CA up to 357 at NF Mokelumne River below Tiger C Reservoir near West Pt, CA.
Gauges on this river, upstream to downstream
Ordered by drainage area, which is how far down the river each gauge sits. April and July figures are long-term median daily flows for that month from the USGS record — historical normals, not a forecast and not today's reading.
| Gauge | State | Drainage sq mi | Elevation ft | April p50 cfs | July p50 cfs | Forecast |
|---|---|---|---|---|---|---|
| NF Mokelumne River below Salt Springs Dam, CA | CA | 170 | — | 96.6 | 34.5 | — |
| NF Mokelumne River below Tiger C Reservoir near West Pt, CA | CA | 357 | — | 243.8 | 52.6 | — |
Typical flow by month at NF Mokelumne River below Tiger C Reservoir near West Pt, CA
The furthest-downstream gauge on this river, so the fullest flow it carries here. Long-term daily discharge percentiles from the USGS record (up to 41 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 | 12.1 | 48.9 | 421.5 | |
| February | 12 | 48.6 | 503.6 | |
| March | 12.1 | 85.5 | 1,118.8 | |
| April | 12.4 | 243.8 | 1,514 | |
| May | 12.7 | 275.1 | 1,841 | |
| June | 12.6 | 123.4 | 1,435.1 | |
| July | 12.7 | 52.6 | 709.4 | |
| August | 13.8 | 46.7 | 285.8 | |
| September | 13.9 | 45.5 | 201.2 | |
| October | 14 | 44.4 | 106.5 | |
| November | 12.1 | 39.1 | 128.9 | |
| December | 12.2 | 44.7 | 348.8 |
All values in cubic feet per second (cfs).
Common questions
- When does the Nf Mokelumne River run highest?
- May, on the long-term record at NF Mokelumne River below Tiger C Reservoir near West Pt, CA — the furthest-downstream gauge Rivermatics tracks on this river. Median daily flow there is about 275.1 cfs that month, against 39.1 cfs in November, the lowest. Upstream gauges peak on their own schedule; the table on this page gives April and July for each.
- How many gauges are on the Nf Mokelumne River?
- Rivermatics tracks 2 USGS streamgages on the Nf Mokelumne River, across California. Each has its own page with the site's full flow record and monthly normals. The river may carry other gauges that publish neither daily values nor discharge statistics; those are not tracked here.
- What river system is the Nf Mokelumne River part of?
- The Nf Mokelumne River drains into the New York Slough system — it is a tributary somewhere in that chain, following the flowpath down to its terminal river. Rivermatics builds this from the USGS/geoconnex reference-mainstem network rather than from names.
- Can I use Nf Mokelumne River 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.
Other rivers in the New York Slough system
- Nf Stanislaus River 4 gauges
- Tuolumne River 4 gauges
- Cherry C 3 gauges
- Angels C 2 gauges
- Bear River 2 gauges
- Big C 2 gauges
- Cole C 2 gauges
- Merced River 2 gauges