Major Flood
10 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
8.5 ft
Minor Flood
6.5 ft
Action Stage
6 ft
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.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | 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 |
About This Gauge
Get Flood Alerts for Lemhi River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Lemhi River near Lemhi?
The Lemhi River near Lemhi gauge is maintained by USGS (site 13305000) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Lemhi River near Lemhi?
The NWS-defined flood stage for Lemhi River near Lemhi is 6.5 feet. Action stage begins at 6 feet. Moderate flooding starts at 8.5 feet, and major flooding at 10 feet.
How do I get alerts when Lemhi River rises?
Download StormCast free on Google Play, go to River Gauges, and add Lemhi River near Lemhi to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Lemhi River near Lemhi gauge located?
The gauge is located in Lemhi County, Idaho at coordinates 44.9400°N, 113.6378°W. USGS site number: 13305000. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey