USGS Streamgage 09171310
South Fork San Miguel River near Ophir, CO
South Fork San Miguel River near Ophir, CO is USGS streamgage 09171310 in Colorado, monitoring river discharge in hydrologic subbasin 14030003. It drains a watershed of about 42 square miles. Discharge records at this site go back to 2011. Typical flow runs near 80.6 cfs in July and 39.7 cfs in April, with the higher of the two arriving in July. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.
View live conditions & forecast →
Gauge details
- State
- Colorado
- Drainage area
- 42 sq mi
- Gauge elevation
- 8,490 ft
- Subbasin (HUC-8)
- 14030003
- Coordinates
- 37.87311, -107.89444
- USGS site number
- 09171310
- Records begin
- 2011-11-01 (15 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for South Fork San Miguel River near Ophir, CO. 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 |
|---|---|---|---|---|
| 21.3 | 22 | 22.6 | ||
| 20.8 | 21.7 | 22.5 | ||
| 20.5 | 21.5 | 22.5 | ||
| 20.8 | 22.4 | 25.3 | ||
| 21.1 | 23.5 | 31.4 | ||
| 21.8 | 25.1 | 38 | ||
| 21.1 | 23.9 | 33.9 | ||
| 20.5 | 23.2 | 30.3 | ||
| 19.9 | 22.5 | 27.9 | ||
| 19.6 | 22.2 | 26.7 | ||
| 19.3 | 21.9 | 26.1 | ||
| 19 | 21.7 | 25.8 | ||
| 18.6 | 21.4 | 25.4 | ||
| 18.4 | 21.3 | 25.1 |
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 15 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 | 18.5 | 27.6 | 35 | |
| February | 18.2 | 28.1 | 37.5 | |
| March | 14.9 | 29.6 | 47.5 | |
| April | 25.1 | 39.7 | 74.1 | |
| May | 51 | 92.5 | 166.2 | |
| June | 58.3 | 178.6 | 402.7 | |
| July | 39.1 | 80.6 | 228.9 | |
| August | 27.9 | 53.5 | 92.3 | |
| September | 26 | 37.6 | 80.5 | |
| October | 26.7 | 33.2 | 63.7 | |
| November | 20.3 | 27.2 | 39.6 | |
| December | 18.6 | 25.6 | 32.5 |
All values in cubic feet per second (cfs).
Common questions
- When does South Fork San Miguel River near Ophir, CO normally run highest?
- June, on the long-term record. The median daily flow that month is about 178.6 cfs, against 25.6 cfs in December, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for South Fork San Miguel River near Ophir, CO?
- It depends on the month. In January, half of days historically fall near 27.6 cfs, with the middle 80% of days between 18.5 and 35 cfs. The month-by-month table on this page gives the full range.
- How long has South Fork San Miguel River near Ophir, CO been measured?
- Discharge records at USGS site 09171310 begin in 2011, about 15 years, covering roughly 5,392 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for South Fork San Miguel River near Ophir, CO?
- 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 South Fork San Miguel River near Ophir, CO?
- The gauge sits at 37.87311, -107.89444, in Colorado, in hydrologic subbasin 14030003, at an elevation of about 8,490 feet, draining roughly 42 square miles.
- Can I use South Fork San Miguel River near Ophir, CO 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.