Henrys Fork near Island Park, ID
Eastern Idaho (Henrys Fork & Snake) · USGS gauge 13042500 · Updated Oct 24, 2:37 PM PDT · USGS data, provisional
All 3 Henrys Fork gauges in Idaho
Reading time: Oct 24, 1:45 PM PDT · Provisional data
Flow is in a typical range for the date. Rivers are generally easiest to fish and float when they are near their normal flow, but this status says nothing about water clarity, hatches, hazards such as wood in the river, or dam releases.
- Vs. normal for this date
- 11th percentile
- Typical range (25th–75th)
- 186–528 cfs
- Median for this date
- 376 cfs
- 7-day low / high
- 89.9 / 94.0 cfs
Plain-language explanation
Henrys Fork near Island Park is flowing at 91.9 cubic feet per second (cfs) as of Oct 24, 1:45 PM PDT. That is on the low side for this time of year: lower than about 89% of the daily flows this gauge has recorded for this date (give or take 7 days) over 94 years of record (1933–2026).
The middle half of those historical flows runs from 186 to 528 cfs, with a median of 376 cfs; the lowest 10% of days are at or below 89.0 cfs and the highest 10% at or above 626 cfs.
Over the last 24 hours the flow has been steady (+2.2%). In the last 7 days it ranged from 89.9 to 94.0 cfs.
Why this status: Flow is within the range this gauge normally sees at this time of year (or the deviation is too small in absolute terms to matter).
Quick answers
Is the Henrys Fork near Island Park fishable today?
Flowcast's status for the Henrys Fork near Island Park is “Fishable/Floatable”: flow is 91.9 cfs, within the range this gauge normally sees at this time of year, at the 11th percentile for this date (as of Oct 24, 1:45 PM PDT). That describes flow only. It says nothing about water clarity, temperature, fish activity, access or fishing regulations.
What is the current flow of the Henrys Fork near Island Park?
91.9 cubic feet per second at USGS gauge 13042500 as of Oct 24, 1:45 PM PDT, provisional data.
Is the Henrys Fork near Island Park too high or too low right now?
Neither: it is inside the typical range for the date (186 to 528 cfs).
Is the Henrys Fork near Island Park rising or falling?
Over the last 24 hours the flow has been steady (+2.2%).
What is a normal flow for the Henrys Fork near Island Park in October?
For this date (give or take 7 days) the median is 376 cfs and the middle half of days runs 186 to 528 cfs, over 94 years of USGS record.
7-day trend
Hourly flow in cfs, Pacific time. The shaded band is the typical range (25th–75th percentile) for this date, shown when it falls within the chart.
| Day (Pacific) | Mean cfs | Percentile | Status that day |
|---|---|---|---|
| Sun Oct 18 | 92.3 | 10th | Fishable/Floatable |
| Mon Oct 19 | 90.9 | 10th | Fishable/Floatable |
| Tue Oct 20 | 90.9 | 10th | Fishable/Floatable |
| Wed Oct 21 | 90.4 | 10th | Fishable/Floatable |
| Thu Oct 22 | 89.9 | 10th | Fishable/Floatable |
| Fri Oct 23 | 90.2 | 11th | Fishable/Floatable |
| Sat Oct 24 (so far) | 91.3 | 11th | Fishable/Floatable |
Seasonal context
Shaded band: 10th–90th percentile of daily flows through the year; dashed line: median. Log scale. Dot: today's flow. Based on 94 years of USGS daily data (1933–2026).
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Official resources
- USGS site page for gauge 13042500 (USGS: live readings, history, station details)
- Idaho Fishing Planner: waters, rules, access (IDFG)
Links go to the agencies' own websites and were checked as working. Flowcast does not summarize fishing or boating rules: regulations and closures change, and the agency pages are the authority.
About this gauge
- USGS site
- USGS-13042500
- USGS name
- Henrys Fork Nr Island Park Id
- Drainage area
- 501 sq mi
- Location
- 44.4167, -111.3947
- Record in this analysis
- 1933–2026
Nearby gauges
- Madison River near West Yellowstone, MT Fishable/Floatable 356 cfs · about 23 mi away (straight line)
- Henrys Fork near Ashton, ID Fishable/Floatable 804 cfs · about 25 mi away (straight line)
- Henrys Fork at St. Anthony, ID Fishable/Floatable 1,370 cfs · about 34 mi away (straight line)
- Yellowstone River at Corwin Springs, MT Fishable/Floatable 1,250 cfs · about 56 mi away (straight line)
- Snake River near Heise, ID Too low 2,040 cfs · about 57 mi away (straight line)
- Madison River near Cameron, MT Fishable/Floatable 994 cfs · about 59 mi away (straight line)
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