About this river
Yellowstone River is a 32.8 mile river near Bridge Bay Marina in Wyoming. Streamflow is measured at the USGS gauge Yellowstone River at Yellowstone Lk Outlet YNP (site 06186500). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1927 to 2026
Yellowstone River typically runs highest in July, at a median 3,890 cfs, and lowest in January, at 375 cfs. The highest flow on record for any single day is 9,930 cfs, in 1997.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 375 | 280 to 500 | |
| February | 385 | 300 to 497 | |
| March | 450 | 373 to 550 | |
| April | 524 | 458 to 609 | |
| May | 976 | 745 to 1,330 | |
| June | 3,720 | 2,930 to 4,590 | |
| July | 3,890 | 2,960 to 5,140 | |
| August | 2,000 | 1,530 to 2,600 | |
| September | 1,100 | 892 to 1,390 | |
| October | 729 | 625 to 929 | |
| November | 597 | 464 to 696 | |
| December | 463 | 350 to 540 |
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 Yellowstone River at Yellowstone Lk Outlet YNP (site 06186500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Yellowstone 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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