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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at will be replaced by the National Water Prediction Service (NWPS), with a target of Spring 2024. Existing AHPS content and features will be preserved and expanded within NWPS. The NWS is now accepting feedback on NWPS. Please visit for more information.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

Hydrograph River at a Glance Download
Beaverhead River at Clark Canyon Dam near Dillon Pool (ft)Observed: 5540.1 ft at 7:00PM Nov 29, 2023Observed: 5540.11 ft at 11:00PM Nov 29, 2023Observed: 5540.11 ft at 1:00AM Nov 30, 2023Observed: 5540.28 ft at 11:00PM Dec 01, 2023Observed: 5540.31 ft at 7:00AM Dec 02, 2023Observed: 5540.36 ft at 1:00PM Dec 02, 2023Observed: 5540.38 ft at 7:00PM Dec 02, 2023Observed: 5540.38 ft at 11:00PM Dec 02, 2023Observed: 5540.38 ft at 1:00AM Dec 03, 2023Observed: 5540.4 ft at 7:00AM Dec 03, 2023Observed: 5540.43 ft at 1:00PM Dec 03, 2023Observed: 5540.46 ft at 7:00PM Dec 03, 2023Observed: 5540.48 ft at 11:00PM Dec 03, 2023Observed: 5540.48 ft at 1:00AM Dec 04, 2023Observed: 5540.49 ft at 7:00AM Dec 04, 2023Observed: 5540.5 ft at 1:00PM Dec 04, 2023Observed: 5540.52 ft at 7:00PM Dec 04, 2023Observed: 5540.54 ft at 11:00PM Dec 04, 2023Observed: 5540.55 ft at 1:00AM Dec 05, 2023Observed: 5540.58 ft at 7:00AM Dec 05, 2023Observed: 5540.61 ft at 1:00PM Dec 05, 2023Observed: 5540.64 ft at 7:00PM Dec 05, 2023Observed: 5540.65 ft at 11:00PM Dec 05, 2023Observed: 5540.65 ft at 1:00AM Dec 06, 2023Observed: 5540.68 ft at 7:00AM Dec 06, 2023Observed: 5540.7 ft at 1:00PM Dec 06, 2023Observed: 5540.72 ft at 7:00PM Dec 06, 2023Observed: 5540.69 ft at 11:00PM Dec 06, 2023Observed: 5540.74 ft at 1:00AM Dec 07, 2023Observed: 5540.75 ft at 7:00AM Dec 07, 2023Observed: 5540.78 ft at 1:00PM Dec 07, 2023Observed: 5540.79 ft at 7:00PM Dec 07, 2023Highest Observation: 5540.81 ft at 11:00PM Dec 07, 2023Highest Observation: 5540.81 ft at 1:00AM Dec 08, 2023CLKM8(plotting HPIRZ) Graph Created (12:38AM Dec 9, 2023)ObservedLatest observed value: 5540.81 ft at 1:00 AM MST 8-Dec-2023.
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Tabular Data (UTC)
Tabular Data (MST)
XML Data
RSS Files
Datum: Not Available
NOTE: Forecasts are not available for the Beaverhead River at Clark Canyon Dam near Dillon. Only observed stages are available for this point.
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Upstream Gauge - at Lima Reservoir near Lima Upstream Gauge Downstream Gauge Downstream Gauge - at Barretts
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 0
Flood Stage: 0
Action Stage: 5560
Low Stage (in feet): 0

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.

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Zoom Level:16
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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.
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Latitude: 45.001667° N, Longitude: 112.857500° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft Not Available 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 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other 0 ft 0 ft  
Additional Information Collapse
Forecast is for reservoir discharge flow in KCFS.
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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
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Great Falls, MT 59404-4933
(406) 453-2081
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