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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 Jefferson River near Three Forks are issued as needed during times of high water, but are not routinely available.
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Downstream Gauge Downstream Gauge - at Toston
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 9
Moderate Flood Stage: 8.5
Flood Stage: 8
Action Stage: 7
Low Stage (in feet): -9999

Historic Crests
(1) 9.88 ft on 01/03/1997
(2) 9.39 ft on 12/10/1980
(3) 9.38 ft on 06/12/2011
(4) 9.20 ft on 06/11/1997
(5) 9.00 ft on 06/09/1995
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(P): Preliminary values subject to further review.

Recent Crests
(1) 8.45 ft on 06/22/2018
(2) 8.53 ft on 05/29/2018
(3) 6.64 ft on 04/29/2012
(4) 8.33 ft on 12/15/2011
(5) 9.38 ft on 06/12/2011
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 1.31 ft on 09/09/1988
(2) 1.31 ft on 08/20/1988
(3) 1.31 ft on 09/07/1988
Show More Low Water Records
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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
8.5 County roads and bridges have water flowing over them. Several homes flood.May 2018 - Old Town Road just north of Three Forks begins to flood. Road had to be closed.
8 Farm buildings flood around Three Forks.Also monitor Boulder River. When Boulder River (BLDM8) starts to go above 8.0 feet, this can have an effect on rise/lowering of the Jefferson River near Three Forks. (June 2017)
7.5 At 7.5 Feet...Agricultural land floods near Three Forks.
7.3 At 7.3 Feet...Water starts to come out of its bank on the Jefferson River near Silver Star and Waterloo in Madison County. The water is near the foundations of several homes. Waterloo Road and Riverside Drive have water on them. An areal flood advisory is recommended from north of Twin Bridges to north of Waterloo. Look at staff gage PBRM8 for data. (June 2017). PBR only available from July thru September starting in 2018.

Other Real-time and/or Archive Data Sources:

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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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