Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit https://www.weather.gov/owp/operations 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.

Weather Forecast Office Great Falls, MT

Missouri Basin River Forecast Center

Hydrograph

River at a Glance

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Probability Information Weekly Chance of Exceeding Levels Chance of Exceeding Levels During Entire Period Short-term Probabilistic Guidance (Experimental)

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NOTE: Stage may be affected by ice during winter months. NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 120 hours into the future from the forecast issuance time. NOTE: Forecasts for the Gallatin River near Gallatin Gateway are issued routinely during the warm season, and as needed at other times of the year.

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Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 7.5 Moderate Flood Stage: 7 Flood Stage: 6 Action Stage: 5 Low Stage (in feet): -9999 Historic Crests (1) 7.38 ft on 06/17/1974 (2) 6.71 ft on 06/02/1997 (3) 6.70 ft on 06/13/2022 (4) 6.51 ft on 06/30/2011 (5) 6.50 ft on 06/06/1991 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 6.70 ft on 06/13/2022 (2) 5.65 ft on 06/01/2018 (3) 5.17 ft on 06/05/2012 (4) 6.51 ft on 06/30/2011 (5) 5.20 ft on 06/05/2010 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) 0.68 ft on 01/19/1935 (2) 0.88 ft on 12/15/1987 For more information on your flood risk go to www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:16 Legend FEMA Layer 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.

Flood Impacts & Photos

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7.2	Small bridge near gallatin gateway and a few homes west of town are beginning to flood.
7.1	Water flows over road connecting two bridges over gallatin river. Three forest service campgrounds flood, including the one at squaw creek.
7	Minor roads in gallatin gateway covered with water.
6.3	Water flows over the axtell and irwin bridges.
6.1	Flooding of the lowlands along the gallatin river.
6	Water flows over roads as well as several smalller bridges. Several forest service campgrounds as well as some home west of town begin to flood.
5	Gallatin river on west side of gallatin gateway can come out of banks at mill road near where the road crosses the river. Water may work into area yards and fields, and may encroach onto mill road.
Photos (1) Looking upstream from gauge house (2) Looking downstream from gauge house

About This Location

Latitude: 45.497222° N, Longitude: 111.270833° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 6 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 5167.67 ft 5173.67 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: U.S. Geological Survey (USGS) Data and Site Info for Gallatin Gateway

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary MBRFC - Missouri Basin River Forecast Center Upper Missouri Reservoir Inflow Forecasts Milk River Reservoir Inflow Forecasts Water Supply Outlook for the Missouri Basin Great Falls Hydrograph Composite Montana East of Divide Hydrograph Composite Glossary Basin Composites - SNOTEL/Flow/Stage CRREL Map of Current Ice Jams

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management NWS - Great Falls Home Page USGS - Montana Daily Streamflow Conditions NRCS - Current Snow and Precipitation Data NOHRSC - Snow Information Montana Drought Information NOAA Drought Information Center Montana Ice Jam Awareness Flood Safety Awareness Week March 14-19, 2016 Video: USGS Streamgages - The Silent Superheroes FEMA National Flood Insurance Program

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 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:28 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities