USGS Streamgage 11463500
Russian River A Geyserville, CA
Russian River A Geyserville, CA is USGS streamgage 11463500 in California, monitoring river discharge in hydrologic subbasin 18010110. It drains a watershed of about 655 square miles. Discharge records at this site go back to 1910. Typical flow runs near 105 cfs in July and 612.1 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.
View live conditions & forecast →
Gauge details
- State
- California
- Drainage area
- 655 sq mi
- Gauge elevation
- 166 ft
- Subbasin (HUC-8)
- 18010110
- Coordinates
- 38.71265, -122.89579
- USGS site number
- 11463500
- Records begin
- 1910-10-01 (116 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Russian River A Geyserville, 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 |
|---|---|---|---|---|
| 88.2 | 90.9 | 94.2 | ||
| 86.1 | 90.9 | 97.2 | ||
| 84.8 | 91 | 99.3 | ||
| 83.6 | 90.7 | 99.8 | ||
| 82.6 | 90.7 | 101 | ||
| 81.9 | 90.7 | 103 | ||
| 80.6 | 89.7 | 100 | ||
| 79.1 | 88.7 | 99.6 | ||
| 77.8 | 87.9 | 99.2 | ||
| 77.3 | 88.8 | 104 | ||
| 78.1 | 91.1 | 109 | ||
| 78.6 | 91.5 | 109 | ||
| 78 | 90.9 | 109 | ||
| 77 | 90 | 107 |
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 116 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 | 123 | 964 | 9,446.1 | |
| February | 191.3 | 709.9 | 9,285.4 | |
| March | 180.2 | 1,065.7 | 6,106.5 | |
| April | 113.4 | 612.1 | 1,617.4 | |
| May | 68.9 | 289.1 | 758 | |
| June | 51.1 | 152.1 | 323.9 | |
| July | 33.6 | 105 | 162.8 | |
| August | 12.1 | 97.2 | 156.3 | |
| September | 6.1 | 98.3 | 162 | |
| October | 8.7 | 94.8 | 357 | |
| November | 36.3 | 154.5 | 1,328.1 | |
| December | 76.4 | 377.3 | 4,476.8 |
All values in cubic feet per second (cfs).
Common questions
- When does Russian River A Geyserville, CA normally run highest?
- March, on the long-term record. The median daily flow that month is about 1,065.7 cfs, against 94.8 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 Russian River A Geyserville, CA?
- It depends on the month. In January, half of days historically fall near 964 cfs, with the middle 80% of days between 123 and 9,446.1 cfs. The month-by-month table on this page gives the full range.
- How long has Russian River A Geyserville, CA been measured?
- Discharge records at USGS site 11463500 begin in 1910, about 116 years, covering roughly 4,849 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Russian River A Geyserville, 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. 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 Russian River A Geyserville, CA?
- The gauge sits at 38.71265, -122.89579, in California, in hydrologic subbasin 18010110, at an elevation of about 166 feet, draining roughly 655 square miles.
- Can I use Russian River A Geyserville, 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.