USGS Streamgage 10340500
Prosser C below Prosser C Dam near Truckee, CA
Prosser C below Prosser C Dam near Truckee, CA is USGS streamgage 10340500 in California, monitoring river discharge in hydrologic subbasin 16050102. It drains a watershed of about 53 square miles. Discharge records at this site go back to 1942. Typical flow runs near 45.4 cfs in July and 93.6 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.
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Gauge details
- State
- California
- Drainage area
- 53 sq mi
- Gauge elevation
- 5,620 ft
- Subbasin (HUC-8)
- 16050102
- Coordinates
- 39.37324, -120.13159
- USGS site number
- 10340500
- Records begin
- 1942-10-01 (84 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Prosser C below Prosser C Dam near Truckee, 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 |
|---|---|---|---|---|
| 44 | 44.2 | 44.5 | ||
| 43.8 | 44.2 | 45.2 | ||
| 43.6 | 44.2 | 47.6 | ||
| 43.3 | 44.2 | 50.6 | ||
| 43.1 | 44.2 | 54.2 | ||
| 42.9 | 44.2 | 56.8 | ||
| 42.6 | 44.3 | 58.1 | ||
| 42.3 | 44.3 | 59.4 | ||
| 42.1 | 44.4 | 61 | ||
| 41.9 | 44.4 | 62.5 | ||
| 41.7 | 44.2 | 60.4 | ||
| 41.5 | 44.2 | 62.4 | ||
| 41.4 | 44.3 | 62.3 | ||
| 41.2 | 44.3 | 61.3 |
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 63 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 | 11.1 | 34.3 | 133.6 | |
| February | 15.7 | 42.5 | 135.7 | |
| March | 26.6 | 80.6 | 199.2 | |
| April | 23.2 | 93.6 | 301.7 | |
| May | 17.1 | 110.2 | 479.4 | |
| June | 12.7 | 66.8 | 240.2 | |
| July | 8.1 | 45.4 | 160.8 | |
| August | 5.9 | 45.4 | 122.8 | |
| September | 5.6 | 81.9 | 212.8 | |
| October | 6.4 | 62.1 | 186 | |
| November | 9.1 | 24.9 | 83.7 | |
| December | 9.9 | 29.3 | 116.6 |
All values in cubic feet per second (cfs).
Common questions
- When does Prosser C below Prosser C Dam near Truckee, CA normally run highest?
- May, on the long-term record. The median daily flow that month is about 110.2 cfs, against 24.9 cfs in November, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Prosser C below Prosser C Dam near Truckee, CA?
- It depends on the month. In January, half of days historically fall near 34.3 cfs, with the middle 80% of days between 11.1 and 133.6 cfs. The month-by-month table on this page gives the full range.
- How long has Prosser C below Prosser C Dam near Truckee, CA been measured?
- Discharge records at USGS site 10340500 begin in 1942, about 84 years, covering roughly 8,782 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Prosser C below Prosser C Dam near Truckee, 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 Prosser C below Prosser C Dam near Truckee, CA?
- The gauge sits at 39.37324, -120.13159, in California, in hydrologic subbasin 16050102, at an elevation of about 5,620 feet, draining roughly 53 square miles.
- Can I use Prosser C below Prosser C Dam near Truckee, 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.