USGS Streamgage 06052500
Gallatin River at Logan, MT
Gallatin River at Logan, MT is USGS streamgage 06052500 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 1,789 square miles. Discharge records at this site go back to 1893. Typical flow runs near 821.7 cfs in July and 992.1 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, alongside daily high and low water-temperature forecasts.
View live conditions & forecast →
Gauge details
- State
- Montana
- Drainage area
- 1,789 sq mi
- Gauge elevation
- 4,092 ft
- Subbasin (HUC-8)
- 10020008
- Coordinates
- 45.88625, -111.44201
- USGS site number
- 06052500
- Records begin
- 1893-10-01 (133 years)
- Rivermatics forecast
- 14-day flow outlook + water temperature
14-day flow forecast
Based on observations through for Gallatin River at Logan, 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 |
|---|---|---|---|---|
| 354 | 366 | 378 | ||
| 345 | 362 | 381 | ||
| 338 | 359 | 387 | ||
| 330 | 355 | 390 | ||
| 323 | 351 | 392 | ||
| 321 | 353 | 401 | ||
| 321 | 356 | 411 | ||
| 319 | 359 | 429 | ||
| 312 | 355 | 433 | ||
| 307 | 353 | 435 | ||
| 303 | 351 | 439 | ||
| 299 | 349 | 443 | ||
| 297 | 348 | 448 | ||
| 294 | 347 | 453 |
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 133 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 | 504.7 | 676.3 | 843.6 | |
| February | 509.7 | 670.6 | 869.1 | |
| March | 575.2 | 731.6 | 1,020.1 | |
| April | 636.5 | 992.1 | 1,509.7 | |
| May | 901.3 | 1,973.9 | 3,773.2 | |
| June | 1,033.3 | 2,805 | 5,298 | |
| July | 271.9 | 821.7 | 1,987.8 | |
| August | 255.9 | 421 | 740.4 | |
| September | 341.4 | 564.6 | 940.8 | |
| October | 503.4 | 711.1 | 1,062.6 | |
| November | 592.8 | 802.2 | 1,050.3 | |
| December | 564.8 | 725.7 | 919.5 |
All values in cubic feet per second (cfs).
Common questions
- When does Gallatin River at Logan, MT normally run highest?
- June, on the long-term record. The median daily flow that month is about 2,805 cfs, against 421 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Gallatin River at Logan, MT?
- It depends on the month. In January, half of days historically fall near 676.3 cfs, with the middle 80% of days between 504.7 and 843.6 cfs. The month-by-month table on this page gives the full range.
- How long has Gallatin River at Logan, MT been measured?
- Discharge records at USGS site 06052500 begin in 1893, about 133 years, covering roughly 9,199 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 at Logan, 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 at Logan, MT?
- The gauge sits at 45.88625, -111.44201, in Montana, in hydrologic subbasin 10020008, at an elevation of about 4,092 feet, draining roughly 1,789 square miles.
- Can I use Gallatin River at Logan, 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 538 sq mi
- Gallatin River near Gallatin Gateway, MT 819 sq mi
- Gallatin River at Logan, MT this page