About this river
Gallatin River is a 27.2 mile river near Montana Guided Fly Fishing, LLC. in Montana. Streamflow is measured at the USGS gauge Gallatin River at Logan MT (site 06052500). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1894 to 2026
Gallatin River typically runs highest in June, at a median 2,825 cfs, and lowest in August, at 409 cfs. The highest flow on record for any single day is 9,840 cfs, in 1899.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 680 | 590 to 743 | |
| February | 672 | 593 to 755 | |
| March | 728 | 644 to 846 | |
| April | 979 | 774 to 1,185 | |
| May | 1,890 | 1,290 to 2,650 | |
| June | 2,825 | 1,945 to 4,125 | |
| July | 617 | 366 to 1,050 | |
| August | 409 | 320 to 535 | |
| September | 572 | 420 to 738 | |
| October | 715 | 599 to 912 | |
| November | 807 | 698 to 919 | |
| December | 719 | 624 to 820 |
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 109 years of record. Statistics published by the US Geological Survey for Gallatin River at Logan MT (site 06052500). 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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