South Fork Snake River level at Irwin
Idaho · Fishing & wading
Measured at USGS 13032500 — SNAKE RIVER NR IRWIN ID · NWS forecast point PALI1
Reading taken · as of 33 min ago
About normal for the date
At 6,890 CFS, this gauge is running 92% of normal for mid-September — close to the 7,510 CFS median USGS has recorded for this date across 80 years of record (1935–2026).
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Flood stages at Irwin
National Weather Service categories for gauge PALI1, WFO PIH. Impact wording is the NWS's own, verbatim.
-
Action 11.0 ft · 20,688 CFS
- 11.0 ft Fields aand low-lying areas near the river from Palisades Dam downstream to near Table Rock Canyon area may experience seep and ponding.
- Right now 7.21 ft
NWS forecast: 7.21 ft by .
Flow history at Irwin
Daily values from USGS 13032500, updated every 15 to 60 minutes; NWS forecast for PALI1 reissued through the day. Provisional.
Highest crests on record at Irwin
12 on record
| Stage | Flow | Date |
|---|---|---|
| 15.25 ft | 41,800 CFS | Jun 20, 1997 |
| 15.01 ft | 40,400 CFS | Jun 19, 1997 |
| 13.31 ft | 31,800 CFS | Jun 4, 1956 |
| 13.18 ft | 31,200 CFS | Jun 28, 1954 |
| 12.69 ft | 28,800 CFS | May 29, 1951 |
| 12.52 ft | 27,800 CFS | Jul 3, 1950 |
| 12.26 ft | 25,400 CFS | Jun 25, 1974 |
| 11.91 ft | 24,500 CFS | Jun 13, 2017 |
| 11.90 ft | 24,200 CFS | Jul 15, 2011 |
| 11.78 ft | 23,800 CFS | Jun 29, 2009 |
Crests published by the National Weather Service.
About South Fork Snake River at Irwin
In Idaho — the reading paddlers, anglers and outfitters here check before committing to a shuttle. Below Palisades Dam; Idaho's premier float-fishing river.
South Fork Snake River at Irwin — common questions
3 questions
What makes the flow change on South Fork Snake River at Irwin?
Rain upstream, plus seasonal baseflow. The 12-month chart shows how it behaves through the year.
Is South Fork Snake River at Irwin high or low for this time of year?
The USGS median flow for mid-September here is 7,510 CFS, from 80 years of record (1935–2026). Today is 92% of it. The comparison is what makes the raw number mean anything: the same reading is a drought on one river and a flood on another.
How often does this reading update?
USGS transmits from gauge 13032500 every 15 to 60 minutes, and the National Weather Service reissues the flood forecast for PALI1 a few times a day — more often when the river is rising. This page refreshes from both when you open it. The timestamp is in the gauge's local time.