About this river
Henrys Fork is a 23.6 mile river near Yellowstone Fishing Guides in Montana. Streamflow is measured at the USGS gauge Henrys Fork near Lake ID (site 13039500). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1920 to 2026
Henrys Fork typically runs highest in July, at a median 108 cfs, and lowest in November, at 10 cfs. The highest flow on record for any single day is 762 cfs, in 1929.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 12 | 3.0 to 23 | |
| February | 14 | 3.9 to 35 | |
| March | 16 | 5.0 to 36 | |
| April | 22 | 6.6 to 57 | |
| May | 43 | 8.0 to 86 | |
| June | 85 | 27 to 157 | |
| July | 108 | 72 to 191 | |
| August | 87 | 59 to 190 | |
| September | 38 | 18 to 67 | |
| October | 13 | 4.0 to 40 | |
| November | 10 | 3.0 to 21 | |
| December | 11 | 3.0 to 22 |
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 102 years of record. Statistics published by the US Geological Survey for Henrys Fork near Lake ID (site 13039500). 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 Henrys Fork'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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