USGS Streamgage 11461500
EF Russian River near Calpella, CA
EF Russian River near Calpella, CA is USGS streamgage 11461500 in California, monitoring river discharge in hydrologic subbasin 18010110. It drains a watershed of about 92 square miles. Discharge records at this site go back to 1941. Typical flow runs near 109.1 cfs in July and 277.1 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
- 92 sq mi
- Gauge elevation
- 791 ft
- Subbasin (HUC-8)
- 18010110
- Coordinates
- 39.24652, -123.13025
- USGS site number
- 11461500
- Records begin
- 1941-10-01 (85 years)
- Rivermatics forecast
- 14-day flow outlook + water temperature
14-day flow forecast
Based on observations through for EF Russian River near Calpella, 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 |
|---|---|---|---|---|
| 30.6 | 35.7 | 40.3 | ||
| 28.1 | 35.8 | 44.4 | ||
| 27.5 | 35.8 | 47 | ||
| 26.8 | 35.5 | 48.1 | ||
| 25.6 | 35 | 48.4 | ||
| 24.6 | 34.5 | 48.8 | ||
| 24.1 | 34.1 | 48.1 | ||
| 23.4 | 33.8 | 49 | ||
| 22.5 | 32.9 | 48.4 | ||
| 21.5 | 32.1 | 48.1 | ||
| 21.8 | 32.5 | 48.5 | ||
| 22.4 | 33.8 | 50.3 | ||
| 23.2 | 35.6 | 53.9 | ||
| 22.8 | 35.2 | 53.7 |
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 85 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 | 67.5 | 346.2 | 1,291.8 | |
| February | 79.1 | 382.4 | 1,250.3 | |
| March | 82.3 | 381.6 | 892.8 | |
| April | 71.6 | 277.1 | 533.8 | |
| May | 63.7 | 182.7 | 345.6 | |
| June | 49.1 | 120 | 269.2 | |
| July | 43.5 | 109.1 | 210.5 | |
| August | 42.4 | 108.7 | 202.8 | |
| September | 42.1 | 143.6 | 285.2 | |
| October | 37.7 | 186.8 | 312.9 | |
| November | 43.4 | 210.8 | 391.6 | |
| December | 49.5 | 294.9 | 970.9 |
All values in cubic feet per second (cfs).
Common questions
- When does EF Russian River near Calpella, CA normally run highest?
- February, on the long-term record. The median daily flow that month is about 382.4 cfs, against 108.7 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for EF Russian River near Calpella, CA?
- It depends on the month. In January, half of days historically fall near 346.2 cfs, with the middle 80% of days between 67.5 and 1,291.8 cfs. The month-by-month table on this page gives the full range.
- How long has EF Russian River near Calpella, CA been measured?
- Discharge records at USGS site 11461500 begin in 1941, about 85 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 EF Russian River near Calpella, 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 EF Russian River near Calpella, CA?
- The gauge sits at 39.24652, -123.13025, in California, in hydrologic subbasin 18010110, at an elevation of about 791 feet, draining roughly 92 square miles.
- Can I use EF Russian River near Calpella, 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.