Marias River near Shelby
Montana — Water Level & Flood Stage
Located in Toole County, Montana on the Marias River. Live water level data from USGS gauge 06099500, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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Flood Stages
Major Flood
15 ft
35,486 cfs
Moderate Flood
13 ft
23,085 cfs
Minor Flood
9 ft
8,613 cfs
Action Stage
8 ft
6,313 cfs
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
14.5 ft
Water encroaches onto Interstate 15. Traffic is blocked. Some ranchers and other residents need to prepare for evacuation.
11.5 ft
A fairway on golf course floods. Williamson Park almost completely innundated.
9 ft
Water floods east and northeast portions of Williamson Park. Low spots on golf course flood.
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 8, 1964 | 23.64 ft | 241,000 cfs |
| Jun 8, 1964 | 23.64 ft | 241,000 cfs |
| Jun 19, 1975 | 18.21 ft | 75,700 cfs |
| Jun 19, 1975 | 18.21 ft | 75,700 cfs |
| Jun 17, 1948 | 17.75 ft | 40,000 cfs |
About This Gauge
Get Flood Alerts for Marias 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 Marias River near Shelby?
The Marias River near Shelby gauge is maintained by USGS (site 06099500) 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 Marias River near Shelby?
The NWS-defined flood stage for Marias River near Shelby is 9 feet. Action stage begins at 8 feet. Moderate flooding starts at 13 feet, and major flooding at 15 feet.
How do I get alerts when Marias River rises?
Download StormCast free on Google Play, go to River Gauges, and add Marias River near Shelby to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Marias River near Shelby gauge located?
The gauge is located in Toole County, Montana at coordinates 48.4272°N, 111.8898°W. USGS site number: 06099500. Data is provided by the U.S. Geological Survey and the National Weather Service.
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Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- Stage may be affected by ice during winter months.