About this river
Gardner River is a 6.3 mile river near Yellowstone Raft Company in Montana. Streamflow is measured at the USGS gauge Gardner River near Mammoth, YNP (site 06191000). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1939 to 2026
Gardner River typically runs highest in June, at a median 638 cfs, and lowest in February, at 92 cfs. The highest flow on record for any single day is 2,160 cfs, in 2022.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 95 | 88 to 102 | |
| February | 92 | 86 to 98 | |
| March | 92 | 87 to 99 | |
| April | 115 | 97 to 148 | |
| May | 452 | 331 to 668 | |
| June | 638 | 434 to 886 | |
| July | 246 | 182 to 327 | |
| August | 145 | 128 to 177 | |
| September | 131 | 115 to 150 | |
| October | 122 | 109 to 138 | |
| November | 110 | 98 to 122 | |
| December | 100 | 90 to 109 |
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 76 years of record. Statistics published by the US Geological Survey for Gardner River near Mammoth, YNP (site 06191000). 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 Gardner 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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