USGS Streamgage 09213500
Big Sandy River near Farson, WY
Big Sandy River near Farson, WY is USGS streamgage 09213500 in Wyoming, monitoring river discharge in hydrologic subbasin 14040104. It sits on the Big Sandy River, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 315 square miles. Discharge records at this site go back to 1914. Typical flow runs near 132.9 cfs in July and 49.4 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
- Wyoming
- Drainage area
- 315 sq mi
- Gauge elevation
- 6,808 ft
- Subbasin (HUC-8)
- 14040104
- Coordinates
- 42.3296, -109.5119
- USGS site number
- 09213500
- Records begin
- 1914-11-01 (112 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Big Sandy River near Farson, WY. 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 |
|---|---|---|---|---|
| 31.1 | 33.2 | 34.8 | ||
| 29.6 | 32.4 | 34.4 | ||
| 28.5 | 31.8 | 34.3 | ||
| 27.5 | 31.4 | 33.9 | ||
| 26.5 | 30.9 | 33.7 | ||
| 26 | 30.8 | 34.3 | ||
| 27.1 | 32.6 | 38.7 | ||
| 27.4 | 33.4 | 41.3 | ||
| 25.9 | 32.3 | 39.5 | ||
| 24.7 | 31.3 | 37.8 | ||
| 23.8 | 30.5 | 36.9 | ||
| 22.7 | 29.7 | 36.1 | ||
| 22.1 | 29.2 | 35.7 | ||
| 21.5 | 28.7 | 35.2 |
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 111 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 | 3.1 | 11.1 | 18.6 | |
| February | 5.5 | 12.3 | 18.4 | |
| March | 12.1 | 19.6 | 41.4 | |
| April | 25.3 | 49.4 | 106.3 | |
| May | 89.1 | 196.3 | 437.7 | |
| June | 149.2 | 356.6 | 703.1 | |
| July | 43.7 | 132.9 | 344.5 | |
| August | 12.9 | 36.6 | 85.7 | |
| September | 9.9 | 23.4 | 54.3 | |
| October | 11.6 | 26.9 | 58.4 | |
| November | 11.2 | 19.2 | 35.5 | |
| December | 6 | 13.4 | 20.3 |
All values in cubic feet per second (cfs).
Common questions
- When does Big Sandy River near Farson, WY normally run highest?
- June, on the long-term record. The median daily flow that month is about 356.6 cfs, against 11.1 cfs in January, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Big Sandy River near Farson, WY?
- It depends on the month. In January, half of days historically fall near 11.1 cfs, with the middle 80% of days between 3.1 and 18.6 cfs. The month-by-month table on this page gives the full range.
- How long has Big Sandy River near Farson, WY been measured?
- Discharge records at USGS site 09213500 begin in 1914, about 112 years, covering roughly 4,641 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Big Sandy River near Farson, WY?
- 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 Big Sandy River near Farson, WY?
- The gauge sits at 42.3296, -109.5119, in Wyoming, in hydrologic subbasin 14040104, at an elevation of about 6,808 feet, draining roughly 315 square miles.
- Can I use Big Sandy River near Farson, WY 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.
Upstream and downstream on the Big Sandy River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Big Sandy River in full.
- Big Sandy River near Farson, WY this page
- Big Sandy River at Gasson Bridge, near Eden, WY 1,485 sq mi