USGS Streamgage 11433300
MF American River near Foresthill, CA
MF American River near Foresthill, CA is USGS streamgage 11433300 in California, monitoring river discharge in hydrologic subbasin 18020128. It drains a watershed of about 524 square miles. Discharge records at this site go back to 1958. Typical flow runs near 667.2 cfs in July and 1,488 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 524 sq mi
- Subbasin (HUC-8)
- 18020128
- Coordinates
- 39.00601, -120.76076
- USGS site number
- 11433300
- Records begin
- 1958-10-01 (68 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 67 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 | 160.3 | 784.3 | 3,224.2 | |
| February | 313.7 | 1,142.8 | 3,328.3 | |
| March | 466.2 | 1,376.5 | 3,600.3 | |
| April | 390.3 | 1,488 | 3,546.3 | |
| May | 282.7 | 1,156.6 | 3,496.8 | |
| June | 292.7 | 768.2 | 2,056.3 | |
| July | 135.5 | 667.2 | 1,190.3 | |
| August | 87.8 | 703.9 | 1,074.5 | |
| September | 83.4 | 577.2 | 1,016.5 | |
| October | 75.6 | 210 | 930.3 | |
| November | 103.3 | 467.8 | 1,156.5 | |
| December | 132.5 | 614.6 | 2,287.7 |
All values in cubic feet per second (cfs).
Common questions
- When does MF American River near Foresthill, CA normally run highest?
- April, on the long-term record. The median daily flow that month is about 1,488 cfs, against 210 cfs in October, 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 American River near Foresthill, CA?
- It depends on the month. In January, half of days historically fall near 784.3 cfs, with the middle 80% of days between 160.3 and 3,224.2 cfs. The month-by-month table on this page gives the full range.
- How long has MF American River near Foresthill, CA been measured?
- Discharge records at USGS site 11433300 begin in 1958, about 68 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 American River near Foresthill, CA?
- The gauge sits at 39.00601, -120.76076, in California, in hydrologic subbasin 18020128, draining roughly 524 square miles.
- Can I use MF American River near Foresthill, 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.
Other gauges in this subbasin
- NF American River A Auburn Dam Site near Auburn, CA
- Mormon Ravine near Newcastle, CA
- Lake Valley Cn near Emigrant Gap, CA
- NF American River A North Fork Dam, CA
- MF American River A French Meadows, CA
- Duncan Cyn C below Diversion Dam near French Meadows, CA
- MF American River Ab MF Ph near Foresthill, CA
- Rubicon River below Hell Hole Dam, CA