About this river
Gallatin River is a 4.1 mile river near Montana Angling Company in Montana. Streamflow is measured at the USGS gauge Gallatin River near Gallatin Gateway, MT (site 06043500). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1889 to 2026
Gallatin River typically runs highest in June, at a median 2,790 cfs, and lowest in February, at 293 cfs. The highest flow on record for any single day is 8,970 cfs, in 1974.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 296 | 266 to 330 | |
| February | 293 | 263 to 330 | |
| March | 297 | 268 to 344 | |
| April | 433 | 353 to 551 | |
| May | 1,670 | 1,190 to 2,350 | |
| June | 2,790 | 2,070 to 3,685 | |
| July | 1,070 | 773 to 1,390 | |
| August | 560 | 462 to 672 | |
| September | 462 | 400 to 560 | |
| October | 432 | 380 to 515 | |
| November | 372 | 322 to 427 | |
| December | 304 | 270 to 352 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 96 years of record. Statistics published by the US Geological Survey for Gallatin River near Gallatin Gateway, MT (site 06043500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Gallatin River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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