Henrys Fork near Ashton, ID
Eastern Idaho (Henrys Fork & Snake) · USGS gauge 13046000 · Updated Oct 24, 2:37 PM PDT · USGS data, provisional
All 3 Henrys Fork gauges in Idaho
Reading time: Oct 24, 2:15 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)
- 950–1,310 cfs
- Median for this date
- 1,130 cfs
- 7-day low / high
- 615 / 804 cfs
Plain-language explanation
Henrys Fork near Ashton is flowing at 804 cubic feet per second (cfs) as of Oct 24, 2:15 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 111 years of record (1890–2026).
The middle half of those historical flows runs from 950 to 1,310 cfs, with a median of 1,130 cfs; the lowest 10% of days are at or below 790 cfs and the highest 10% at or above 1,520 cfs.
Over the last 24 hours the flow has been rising (+22.2%). In the last 7 days it ranged from 615 to 804 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 Ashton fishable today?
Flowcast's status for the Henrys Fork near Ashton is “Fishable/Floatable”: flow is 804 cfs, within the range this gauge normally sees at this time of year, at the 11th percentile for this date (as of Oct 24, 2:15 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 Ashton?
804 cubic feet per second at USGS gauge 13046000 as of Oct 24, 2:15 PM PDT, provisional data.
Is the Henrys Fork near Ashton too high or too low right now?
Neither: it is inside the typical range for the date (950 to 1,310 cfs).
Is the Henrys Fork near Ashton rising or falling?
Over the last 24 hours the flow has been rising (+22.2%).
What is a normal flow for the Henrys Fork near Ashton in October?
For this date (give or take 7 days) the median is 1,130 cfs and the middle half of days runs 950 to 1,310 cfs, over 111 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 | 621 | 1st | Too low |
| Mon Oct 19 | 626 | 1st | Too low |
| Tue Oct 20 | 633 | 2nd | Too low |
| Wed Oct 21 | 645 | 2nd | Too low |
| Thu Oct 22 | 651 | 2nd | Too low |
| Fri Oct 23 | 674 | 2nd | Too low |
| Sat Oct 24 (so far) | 759 | 8th | Too low |
Seasonal context
Shaded band: 10th–90th percentile of daily flows through the year; dashed line: median. Log scale. Dot: today's flow. Based on 111 years of USGS daily data (1890–2026).
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Official resources
- USGS site page for gauge 13046000 (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-13046000
- USGS name
- Henrys Fork Nr Ashton Id
- Drainage area
- 1,097 sq mi
- Location
- 44.0697, -111.5106
- Record in this analysis
- 1890–2026
Nearby gauges
- Henrys Fork at St. Anthony, ID Fishable/Floatable 1,370 cfs · about 11 mi away (straight line)
- Henrys Fork near Island Park, ID Fishable/Floatable 91.9 cfs · about 25 mi away (straight line)
- Snake River near Heise, ID Too low 2,040 cfs · about 32 mi away (straight line)
- Madison River near West Yellowstone, MT Fishable/Floatable 356 cfs · about 46 mi away (straight line)
- Snake River near Irwin, ID Fishable/Floatable 1,420 cfs · about 52 mi away (straight line)
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