About this river
Snake River is a 14.3 mile river near Mad River Boat Trips in Wyoming. Streamflow is measured at the USGS gauge Snake River near Irwin ID (site 13032500). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1935 to 2026
Snake River typically runs highest in June, at a median 13,350 cfs, and lowest in December, at 1,450 cfs. The highest flow on record for any single day is 40,300 cfs, in 1997.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 1,530 | 1,040 to 2,750 | |
| February | 1,510 | 1,040 to 2,740 | |
| March | 1,840 | 1,060 to 4,050 | |
| April | 4,205 | 2,015 to 9,840 | |
| May | 11,900 | 10,100 to 15,000 | |
| June | 13,350 | 11,500 to 17,050 | |
| July | 12,900 | 11,900 to 13,900 | |
| August | 8,940 | 8,060 to 9,820 | |
| September | 7,130 | 6,020 to 7,880 | |
| October | 3,010 | 2,450 to 3,530 | |
| November | 1,635 | 969 to 2,500 | |
| December | 1,450 | 1,010 to 2,490 |
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 80 years of record. Statistics published by the US Geological Survey for Snake River near Irwin ID (site 13032500). 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 Snake River'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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