RIVER GAUGE · LEMHI RIVER
Lemhi River near Lemhi
Lemhi County, Idaho
Water level3.55 ft
Flow106 cfs
Last readingSep 16, 2026, 5:00 PM UTC (last recorded)
Action6 ft
Minor flood6.5 ft
Moderate flood8.5 ft
Major flood10 ft
The past week
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What floods at each level
- 10 ft
Mainy bridges along Highway 28 will be overtopped and flooded from Lemhi to Tendoy.
- 8.5 ft
Possible damage to irrigation diversion headgates and ditches.
- 7 ft
Expect possible flooding to Highway 28 from Tendoy to Salmon.
- 6.5 ft
Expect flooding to ranchland adjacent to the river from Tendoy to Salmon.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Jun 20, 1984 | 7.19 ft | 2,430 cfs |
| Jan 28, 2026 | 7.07 ft | 1,860 cfs |
| Jul 5, 1975 | 6.72 ft | 1,990 cfs |
Get an alert when Lemhi River rises
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