Sun River near Simms
Montana — Water Level & Flood Stage
Located in Cascade County, Montana on the Sun River. Live water level data from USGS gauge 06085800, 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
10.5 ft
50,029 cfs
Moderate Flood
8.5 ft
14,125 cfs
Minor Flood
7.5 ft
6,724 cfs
Action Stage
6 ft
4,213 cfs
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
12 ft
Major flooding. More than 100,000 acres flood.
10.8 ft
At 10.8 Feet - June 20 2018 - Flooding in the city of Sun River similar to 2011. Most streets under water. Photos estimate water 2 to 4 feet deep. Highway 200 Closed from the 89 Junction all the way to the 287 Junction. Roger's Pass had a culvert washout which closed that section.
10.7 ft
June 2018 - 1st and 2nd street flood in Sun River. Gravel washed away roadway, exposing optic cables. In Fort Shaw - North Fort Shaw Road completely destroyed. Culverts under roadway were exposed.
9.1 ft
May 27, 2019 - At 9.1 feet - Streets and homes in Sun River flooded. Not as bad as the 2018 flood. Highway 200 had water over the highway, with flaggers. Water around homes. Fields did flood.
9 ft
Much of the valley is flooded. Highway 200 flooded. Many homes as well as agricultural land floods.
8.5 ft
Hwy 200 through town of Sun River, between 1st St and 3rd St, under water. Significant inundation of town between river to W, N, and E of town to beyond W Carroll St/Steell St. Sun River-Cascade Rd inundated for approx 1/3 mile to south of town.
8 ft
Water starting to cover Hwy 200 between 1st St and 2nd ST. River well out of banks W, N and E of town and filling old oxbows near town and Hwy 200.
7.5 ft
River out of banks and across highway at Sun River (town). Water over Fairfield Road. River within banks at Simms and Fort Shaw. About two dozen homes in Sun River (town) become isolated.
7 ft
Minor overflow between Fort Shaw and Sun River (town) where the river meanders and gets into the old river bed.
6.5 ft
Some overflow between Fort Shaw and Sun Siver (town) where the river meanders and gets into the old river bed.
6 ft
River is bankfull.
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 | 13.7 ft | 50,000 cfs |
| Jun 8, 1964 | 13.7 ft | 50,000 cfs |
| Jun 19, 1975 | 12.48 ft | 37,900 cfs |
| Jun 19, 1975 | 12.48 ft | 37,900 cfs |
| Jun 19, 2018 | 10.75 ft | 17,658 cfs |
About This Gauge
Get Flood Alerts for Sun 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 Sun River near Simms?
The Sun River near Simms gauge is maintained by USGS (site 06085800) 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 Sun River near Simms?
The NWS-defined flood stage for Sun River near Simms is 7.5 feet. Action stage begins at 6 feet. Moderate flooding starts at 8.5 feet, and major flooding at 10.5 feet.
How do I get alerts when Sun River rises?
Download StormCast free on Google Play, go to River Gauges, and add Sun River near Simms 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 Sun River near Simms gauge located?
The gauge is located in Cascade County, Montana at coordinates 47.5016°N, 111.9319°W. USGS site number: 06085800. 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.