USGS Streamgage 06043120
Gallatin River above Deer Creek, near Big Sky, MT
Gallatin River above Deer Creek, near Big Sky, MT is USGS streamgage 06043120 in Montana, monitoring river discharge in hydrologic subbasin 10020008. It sits on the Gallatin River, alongside 2 other gauges Rivermatics tracks on the same river. It drains a watershed of about 538 square miles. Discharge records at this site go back to 2019. Typical flow runs near 703.2 cfs in July and 319.3 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, alongside daily high and low water-temperature forecasts.
View live conditions & forecast →
Gauge details
- State
- Montana
- Drainage area
- 538 sq mi
- Gauge elevation
- 5,880 ft
- Subbasin (HUC-8)
- 10020008
- Coordinates
- 45.29728, -111.21139
- USGS site number
- 06043120
- Records begin
- 2019-05-01 (7 years)
- Rivermatics forecast
- 14-day flow outlook + water temperature
14-day flow forecast
Based on observations through for Gallatin River above Deer Creek, near Big Sky, MT. 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 |
|---|---|---|---|---|
| 233 | 246 | 254 | ||
| 228 | 243 | 253 | ||
| 223 | 239 | 250 | ||
| 218 | 236 | 248 | ||
| 214 | 233 | 246 | ||
| 215 | 235 | 253 | ||
| 214 | 236 | 255 | ||
| 208 | 232 | 254 | ||
| 203 | 230 | 254 | ||
| 198 | 227 | 253 | ||
| 193 | 225 | 253 | ||
| 192 | 225 | 257 | ||
| 188 | 223 | 257 | ||
| 185 | 222 | 258 |
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 7 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 | — | 215.8 | — | |
| February | — | 208.1 | — | |
| March | — | 221 | — | |
| April | — | 319.3 | — | |
| May | — | 1,231.4 | — | |
| June | — | 1,800 | — | |
| July | — | 703.2 | — | |
| August | — | 402.2 | — | |
| September | — | 312.9 | — | |
| October | — | 290.7 | — | |
| November | — | 260.9 | — | |
| December | — | 222.7 | — |
All values in cubic feet per second (cfs).
Common questions
- When does Gallatin River above Deer Creek, near Big Sky, MT normally run highest?
- June, on the long-term record. The median daily flow that month is about 1,800 cfs, against 208.1 cfs in February, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- How long has Gallatin River above Deer Creek, near Big Sky, MT been measured?
- Discharge records at USGS site 06043120 begin in 2019, about 7 years, covering roughly 2,639 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Gallatin River above Deer Creek, near Big Sky, MT?
- 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 Gallatin River above Deer Creek, near Big Sky, MT?
- The gauge sits at 45.29728, -111.21139, in Montana, in hydrologic subbasin 10020008, at an elevation of about 5,880 feet, draining roughly 538 square miles.
- Can I use Gallatin River above Deer Creek, near Big Sky, MT 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 Gallatin River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Gallatin River in full.
- Gallatin River above Deer Creek, near Big Sky, MT this page
- Gallatin River near Gallatin Gateway, MT 819 sq mi
- Gallatin River at Logan, MT 1,789 sq mi