About this river
Henrys Fork is a 29.6 mile river near Three Rivers Ranch in Idaho. Streamflow is measured at the USGS gauge Henrys Fork near Island Park ID (site 13042500). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1933 to 2026
Henrys Fork typically runs highest in July, at a median 1,160 cfs, and lowest in November, at 194 cfs. The highest flow on record for any single day is 2,990 cfs, in 1984.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 284 | 93 to 446 | |
| February | 320 | 176 to 454 | |
| March | 335 | 206 to 460 | |
| April | 436 | 320 to 562 | |
| May | 888 | 650 to 1,200 | |
| June | 898 | 679 to 1,205 | |
| July | 1,160 | 872 to 1,500 | |
| August | 1,020 | 843 to 1,200 | |
| September | 638 | 482 to 844 | |
| October | 391 | 212 to 535 | |
| November | 194 | 72 to 407 | |
| December | 295 | 95 to 461 |
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 93 years of record. Statistics published by the US Geological Survey for Henrys Fork near Island Park ID (site 13042500). 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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