USGS Streamgage 11381500
Mill C near Los Molinos, CA
Mill C near Los Molinos, CA is USGS streamgage 11381500 in California, monitoring river discharge in hydrologic subbasin 18020156. It drains a watershed of about 131 square miles. Discharge records at this site go back to 1928. Typical flow runs near 148 cfs in July and 373.4 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead, alongside daily high and low water-temperature forecasts.
View live conditions & forecast →
Gauge details
- State
- California
- Drainage area
- 131 sq mi
- Gauge elevation
- 384 ft
- Subbasin (HUC-8)
- 18020156
- Coordinates
- 40.0546, -122.02415
- USGS site number
- 11381500
- Records begin
- 1928-10-01 (98 years)
- Rivermatics forecast
- 14-day flow outlook + water temperature
14-day flow forecast
Based on observations through for Mill C near Los Molinos, CA. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 109 | 110 | 112 | ||
| 108 | 110 | 112 | ||
| 107 | 110 | 112 | ||
| 107 | 110 | 113 | ||
| 106 | 110 | 113 | ||
| 105 | 109 | 112 | ||
| 105 | 109 | 113 | ||
| 104 | 109 | 113 | ||
| 104 | 109 | 113 | ||
| 103 | 108 | 113 | ||
| 103 | 109 | 115 | ||
| 104 | 110 | 117 | ||
| 103 | 110 | 117 | ||
| 102 | 109 | 116 |
All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 98 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 | 115.6 | 220.2 | 997.3 | |
| February | 137.6 | 281.8 | 1,043.1 | |
| March | 181.8 | 329.5 | 855.6 | |
| April | 215.9 | 373.4 | 717.2 | |
| May | 203.5 | 401.1 | 729.2 | |
| June | 135.4 | 289.4 | 574.3 | |
| July | 93.6 | 148 | 292.6 | |
| August | 78 | 109.7 | 163.5 | |
| September | 75.5 | 102.7 | 135.5 | |
| October | 80.2 | 106.5 | 153.4 | |
| November | 89.6 | 126.2 | 309.3 | |
| December | 99.3 | 158.9 | 813.2 |
All values in cubic feet per second (cfs).
Common questions
- When does Mill C near Los Molinos, CA normally run highest?
- May, on the long-term record. The median daily flow that month is about 401.1 cfs, against 102.7 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 Mill C near Los Molinos, CA?
- It depends on the month. In January, half of days historically fall near 220.2 cfs, with the middle 80% of days between 115.6 and 997.3 cfs. The month-by-month table on this page gives the full range.
- How long has Mill C near Los Molinos, CA been measured?
- Discharge records at USGS site 11381500 begin in 1928, about 98 years, covering roughly 9,131 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Mill C near Los Molinos, CA?
- Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. A companion model forecasts each day's water-temperature high and low. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
- Where is Mill C near Los Molinos, CA?
- The gauge sits at 40.0546, -122.02415, in California, in hydrologic subbasin 18020156, at an elevation of about 384 feet, draining roughly 131 square miles.
- Can I use Mill C near Los Molinos, 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.