Snake River near Irwin, ID
Eastern Idaho (Henrys Fork & Snake) · USGS gauge 13032500 · Updated Oct 24, 2:37 PM PDT · USGS data, provisional
All 3 Snake River gauges in Idaho
Reading time: Oct 24, 2:30 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
- 12th percentile
- Typical range (25th–75th)
- 1,990–3,150 cfs
- Median for this date
- 2,620 cfs
- 7-day low / high
- 1,390 / 3,600 cfs
Plain-language explanation
Snake River near Irwin is flowing at 1,420 cubic feet per second (cfs) as of Oct 24, 2:30 PM PDT. That is on the low side for this time of year: lower than about 88% of the daily flows this gauge has recorded for this date (give or take 7 days) over 82 years of record (1935–2026).
The middle half of those historical flows runs from 1,990 to 3,150 cfs, with a median of 2,620 cfs; the lowest 10% of days are at or below 1,401 cfs and the highest 10% at or above 3,689 cfs.
Over the last 24 hours the flow has been steady (+0.0%). In the last 7 days it ranged from 1,390 to 3,600 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 Snake River near Irwin fishable today?
Flowcast's status for the Snake River near Irwin is “Fishable/Floatable”: flow is 1,420 cfs, within the range this gauge normally sees at this time of year, at the 12th percentile for this date (as of Oct 24, 2:30 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 Snake River near Irwin?
1,420 cubic feet per second at USGS gauge 13032500 as of Oct 24, 2:30 PM PDT, provisional data.
Is the Snake River near Irwin too high or too low right now?
Neither: it is inside the typical range for the date (1,990 to 3,150 cfs).
Is the Snake River near Irwin rising or falling?
Over the last 24 hours the flow has been steady (+0.0%).
What is a normal flow for the Snake River near Irwin in October?
For this date (give or take 7 days) the median is 2,620 cfs and the middle half of days runs 1,990 to 3,150 cfs, over 82 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 | 2,548 | 34th | Fishable/Floatable |
| Mon Oct 19 | 2,224 | 23rd | Fishable/Floatable |
| Tue Oct 20 | 1,776 | 14th | Fishable/Floatable |
| Wed Oct 21 | 1,656 | 14th | Fishable/Floatable |
| Thu Oct 22 | 1,411 | 9th | Too low |
| Fri Oct 23 | 1,420 | 10th | Fishable/Floatable |
| Sat Oct 24 (so far) | 1,422 | 12th | 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 82 years of USGS daily data (1935–2026).
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Official resources
- USGS site page for gauge 13032500 (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-13032500
- USGS name
- Snake River Nr Irwin Id
- Drainage area
- 5,225 sq mi
- Location
- 43.3508, -111.2189
- Record in this analysis
- 1935–2026
Nearby gauges
- Snake River near Heise, ID Too low 2,040 cfs · about 29 mi away (straight line)
- Henrys Fork at St. Anthony, ID Fishable/Floatable 1,370 cfs · about 48 mi away (straight line)
- Henrys Fork near Ashton, ID Fishable/Floatable 804 cfs · about 52 mi away (straight line)
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