About this river
Lemhi River is a 2.6 mile river near Salmon River Adventure Company in Idaho. Streamflow is measured at the USGS gauge Lemhi River below L5 Diversion near Salmon, ID (site 13305310). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1993 to 2025
Lemhi River typically runs highest in June, at a median 466 cfs, and lowest in August, at 26 cfs. The highest flow on record for any single day is 2,610 cfs, in 1995.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 240 | 205 to 287 | |
| February | 250 | 215 to 297 | |
| March | 288 | 235 to 337 | |
| April | 271 | 167 to 345 | |
| May | 238 | 69 to 339 | |
| June | 466 | 271 to 876 | |
| July | 77 | 30 to 185 | |
| August | 26 | 25 to 38 | |
| September | 28 | 26 to 61 | |
| October | 226 | 146 to 309 | |
| November | 300 | 251 to 342 | |
| December | 249 | 212 to 287 |
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 31 years of record. Statistics published by the US Geological Survey for Lemhi River below L5 Diversion near Salmon, ID (site 13305310). 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 Lemhi River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
See every free widget you can put on your site, including live conditions and a 7 day forecast.
