About this river
South Fork Madison River is an 8.4 mile river near Yellowstone Fishing Guides in Montana. Streamflow is measured at the USGS gauge Madison River near West Yellowstone, MT (site 06037500). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1913 to 2026
South Fork Madison River typically runs highest in May, at a median 794 cfs, and lowest in February, at 391 cfs. The highest flow on record for any single day is 2,750 cfs, in 1996.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 394 | 360 to 434 | |
| February | 391 | 360 to 422 | |
| March | 395 | 370 to 433 | |
| April | 462 | 422 to 531 | |
| May | 794 | 659 to 1,000 | |
| June | 732 | 561 to 957 | |
| July | 443 | 383 to 540 | |
| August | 412 | 363 to 470 | |
| September | 404 | 359 to 463 | |
| October | 412 | 368 to 474 | |
| November | 408 | 372 to 457 | |
| December | 405 | 364 to 445 |
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 99 years of record. Statistics published by the US Geological Survey for Madison River near West Yellowstone, MT (site 06037500). 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 South Fork Madison 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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