National Weather Service Advanced Hydrologic Prediction Service

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Weather Forecast Office Great Falls, MT

Missouri Basin River Forecast Center

Hydrograph

River at a Glance

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Saint Mary River at International boundary

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About this graph

Tabular Data (UTC)

Tabular Data (MST)

Datum: Not Available

Metadata

NOTE: Stage may be affected by ice during winter months.

NOTE: Forecasts for the Saint Mary River at International boundary are issued as needed during times of high water, but are not routinely available.

Return to Area Map

Upstream Gauge

Flood Categories (in feet)

Major Flood Stage:	9.5
Moderate Flood Stage:	8.5
Flood Stage:	7.5
Action Stage:	6.5
Low Stage (in feet):	-9999

Historic Crests
(1) 13.46 ft on 06/21/1975
(2) 12.75 ft on 06/05/1908
(3) 12.02 ft on 05/28/2019
(4) 10.99 ft on 06/07/1995
(5) 9.96 ft on 03/13/2003
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 12.02 ft on 05/28/2019
(2) 9.00 ft on 06/19/2014
(3) 6.82 ft on 05/15/2013
(4) 7.12 ft on 06/27/2012
(5) 7.80 ft on 06/09/2011
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.

Show FEMA's National Flood Hazard Layers

Zoom Level:16

	Gauge Location	Disclaimer
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.

About This Location

Latitude: 49.011408° N, Longitude: 113.299547° W, Horizontal Datum: NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS stage	0 ft	7.5 ft	Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum	Elevation (gauge height = 0)	Elevation (gauge height = flood stage)	Elevation information source
NAVD88	Not Available	Not Available	Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29	Not Available	Not Available	Older USGS topographic maps, NGVD29 benchmarks
MSL	Not Available	Not Available	Older USGS topographic maps, MSL benchmarks
Other	4087.4	Not Available

Current/Historical Observations:

U.S. Geological Survey (USGS) Data and Site Info for International boundary

Resources

Hydrologic Resources

Additional Resources

Collaborative Agencies

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: 30-Oct-2020 4:08 PM

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