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Hydrograph River at a Glance Download
Marias River near Shelby Stage (ft)Observed: 6.13 ft at 11:00PM Jan 22, 2022Observed: 5.51 ft at 11:15PM Jan 22, 2022Observed: 6.54 ft at 11:30PM Jan 22, 2022Observed: 5.79 ft at 11:45PM Jan 22, 2022Observed: 5.8 ft at 12:00AM Jan 23, 2022Observed: 5.72 ft at 12:15AM Jan 23, 2022Observed: 5.66 ft at 12:30AM Jan 23, 2022Observed: 5.75 ft at 12:45AM Jan 23, 2022Observed: 5.85 ft at 1:00AM Jan 23, 2022Observed: 5.76 ft at 1:15AM Jan 23, 2022Observed: 5.35 ft at 1:30AM Jan 23, 2022Observed: 5.96 ft at 1:45AM Jan 23, 2022Observed: 6.41 ft at 2:00AM Jan 23, 2022Observed: 6.69 ft at 2:15AM Jan 23, 2022Observed: 6.84 ft at 2:30AM Jan 23, 2022Highest Observation: 7.19 ft at 2:45AM Jan 23, 2022Observed: 6.74 ft at 3:00AM Jan 23, 2022Observed: 6.45 ft at 3:15AM Jan 23, 2022Observed: 7.02 ft at 3:30AM Jan 23, 2022Observed: 6.08 ft at 3:45AM Jan 23, 2022Observed: 6.64 ft at 4:00AM Jan 23, 2022Observed: 6.94 ft at 4:15AM Jan 23, 2022Observed: 6.32 ft at 4:30AM Jan 23, 2022Observed: 6.85 ft at 4:45AM Jan 23, 2022Observed: 6.61 ft at 5:00AM Jan 23, 2022Observed: 6.44 ft at 5:15AM Jan 23, 2022Observed: 6.77 ft at 5:30AM Jan 23, 2022Observed: 7.08 ft at 5:45AM Jan 23, 2022Observed: 6.61 ft at 6:00AM Jan 23, 2022Observed: 6.87 ft at 6:15AM Jan 23, 2022Observed: 6.34 ft at 6:30AM Jan 23, 2022Observed: 6.48 ft at 6:45AM Jan 23, 2022Observed: 6.68 ft at 7:00AM Jan 23, 2022Observed: 6.68 ft at 7:15AM Jan 23, 2022Observed: 6.65 ft at 7:30AM Jan 23, 2022Observed: 6.54 ft at 7:45AM Jan 23, 2022Observed: 6.47 ft at 8:00AM Jan 23, 2022Observed: 6.48 ft at 8:15AM Jan 23, 2022Observed: 6.44 ft at 8:30AM Jan 23, 2022Observed: 6.48 ft at 8:45AM Jan 23, 2022Observed: 6.46 ft at 9:00AM Jan 23, 2022Observed: 6.36 ft at 9:15AM Jan 23, 2022Observed: 6.32 ft at 9:30AM Jan 23, 2022Observed: 5.83 ft at 9:45AM Jan 23, 2022Observed: 5.74 ft at 10:00AM Jan 23, 2022Observed: 5.32 ft at 10:15AM Jan 23, 2022Observed: 5.45 ft at 10:30AM Jan 23, 2022USGS--Water Resources of the United StatesSHLM8(plotting HGIRG) Graph Created (11:07AM Jan 23, 2022)ObservedLatest observed value: 5.45 ft at 10:30 AM MST 23-Jan-2022. Flood Stage is 9 ft
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Tabular Data (UTC)
Tabular Data (MST)
XML Data
RSS Files
Datum: Not Available
NOTE: Stage may be affected by ice during winter months.

NOTE: Forecasts for the Marias River near Shelby are issued routinely during the warm season, and as needed at other times of the year.

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Upstream Gauge - near Swift Dam near Dupuyer Upstream Gauge Downstream Gauge Downstream Gauge - at Tiber Reservoir / Lake Elwell
Flood Categories (in feet)
Major Flood Stage: 15
Moderate Flood Stage: 13
Flood Stage: 9
Action Stage: 8
Low Stage (in feet): -9999

Historic Crests
(1) 23.64 ft on 06/09/1964
(2) 18.21 ft on 06/20/1975
(3) 17.75 ft on 06/18/1948
(4) 16.05 ft on 03/12/1996
(5) 13.96 ft on 01/27/2011
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(P): Preliminary values subject to further review.

Recent Crests
(1) 9.96 ft on 06/21/2018
(2) 8.32 ft on 05/12/2018
(3) 6.21 ft on 03/17/2015
(4) 10.61 ft on 06/19/2014
(5) 11.72 ft on 03/10/2014
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(P): Preliminary values subject to further review.

Low Water Records
(1) 2.34 ft on 09/10/1988
(2) 2.55 ft on 08/29/1983
(3) 2.73 ft on 08/08/1985
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For more information on your flood risk go to

Zoom Level:16
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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.
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14.5 Water encroaches onto Interstate 15. Traffic is blocked. Some ranchers and other residents need to prepare for evacuation.
11.5 A fairway on golf course floods. Williamson Park almost completely innundated.
9 Water floods east and northeast portions of Williamson Park. Low spots on golf course flood.
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Latitude: 48.427197° N, Longitude: 111.889836° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 9 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(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 3087.71997070312 ft 3096.71997070312 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:

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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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