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This probabilistic forecast is issued by the Missouri Basin River Forecast Center.
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About this graph
Forecasts for the Sun River near Simms are issued as needed during times of high water, but are not routinely available.
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Downstream Gauge Downstream Gauge - near Vaughn
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 10.5
Moderate Flood Stage: 8.5
Flood Stage: 7.5
Action Stage: 6
Low Stage (in feet): -9999

Historic Crests
(1) 13.70 ft on 06/09/1964
(2) 12.48 ft on 06/20/1975
(3) 10.75 ft on 06/20/2018
(4) 9.87 ft on 06/08/2011
(5) 9.15 ft on 05/27/2019
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(P): Preliminary values subject to further review.

Recent Crests
(1) 9.15 ft on 05/27/2019
(2) 10.75 ft on 06/20/2018
(3) 8.10 ft on 05/12/2018
(4) 5.00 ft on 06/25/2014
(5) 4.98 ft on 06/09/2013
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
12 Major flooding. More than 100,000 acres flood.
10.8 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 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 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 Much of the valley is flooded. Highway 200 flooded. Many homes as well as agricultural land floods.
8.5 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 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 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 Minor overflow between Fort Shaw and Sun River (town) where the river meanders and gets into the old river bed.
6.5 Some overflow between Fort Shaw and Sun Siver (town) where the river meanders and gets into the old river bed.
6 River is bankfull.
(1) Sun River near Simms looking downstream from highway bridge near gauge house
(2) Sun River near Simms looking down at river from bluff

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
Gauge readings available seasonally. Data unavailable during winter months.
Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
Great Falls Weather Forecast Office
5324 Tri-Hill Frontage Rd
Great Falls, MT 59404-4933
(406) 453-2081
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Page last modified: 2-Nov-2020 7:28 PM
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