{ "lid": "GLGM8", "usgsId": "06043500", "reachId": "3855315", "name": "Gallatin River near Gallatin Gateway", "description": "", "rfc": { "abbreviation": "MBRFC", "name": "Missouri Basin River Forecast Center" }, "wfo": { "abbreviation": "TFX", "name": "Great Falls" }, "state": { "abbreviation": "MT", "name": "Montana" }, "county": "Gallatin", "timeZone": "MST7MDT", "latitude": 45.497222222222, "longitude": -111.27083333333, "pedts": { "observed": "HGIRG", "forecast": "HGIFF" }, "status": { "observed": { "primary": 1.44, "primaryUnit": "ft", "secondary": 0.381, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-10-13T20:00:00Z" }, "forecast": { "primary": -999, "primaryUnit": "", "secondary": -999, "secondaryUnit": "", "floodCategory": "fcst_not_current", "validTime": "0001-01-01T00:00:00Z" } }, "flood": { "stageUnits": "ft", "flowUnits": "cfs", "categories": { "major": { "stage": 7.5, "flow": 11200 }, "moderate": { "stage": 7, "flow": 9726 }, "minor": { "stage": 6, "flow": 6886 }, "action": { "stage": 5, "flow": 4846 } }, "lro": { "minorCS": "< 0.05", "moderateCS": "< 0.05", "majorCS": "< 0.05", "producedTime": "2026-09-23T20:05:04Z", "interval": "OND" }, "crests": { "historic": [ { "occurredTime": "1974-06-17T00:00:00Z", "stage": 7.38, "flow": 9100, "preliminary": "O", "olddatum": false }, { "occurredTime": "1997-06-02T00:00:00Z", "stage": 6.71, "flow": 9160, "preliminary": "O", "olddatum": false }, { "occurredTime": "2022-06-13T22:45:00Z", "stage": 6.7, "flow": 8980, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-06-30T00:00:00Z", "stage": 6.51, "flow": 8410, "preliminary": "O", "olddatum": false }, { "occurredTime": "1991-06-06T00:00:00Z", "stage": 6.5, "flow": 7640, "preliminary": "O", "olddatum": false }, { "occurredTime": "1971-06-27T00:00:00Z", "stage": 6.49, "flow": 7610, "preliminary": "O", "olddatum": false }, { "occurredTime": "1970-06-09T00:00:00Z", "stage": 6.48, "flow": 7600, "preliminary": "O", 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"stage": 5.56, "flow": 6570, "preliminary": "O", "olddatum": false }, { "occurredTime": "1967-06-22T00:00:00Z", "stage": 5.44, "flow": 5960, "preliminary": "O", "olddatum": false }, { "occurredTime": "1966-05-31T00:00:00Z", "stage": 4.69, "flow": 4530, "preliminary": "O", "olddatum": false }, { "occurredTime": "1965-06-13T00:00:00Z", "stage": 6.02, "flow": 7010, "preliminary": "O", "olddatum": false }, { "occurredTime": "1964-06-08T00:00:00Z", "stage": 5.7, "flow": 6450, "preliminary": "O", "olddatum": false }, { "occurredTime": "1963-06-15T00:00:00Z", "stage": 4.91, "flow": 4800, "preliminary": "O", "olddatum": false }, { "occurredTime": "1962-06-14T00:00:00Z", "stage": 4.89, "flow": 4780, "preliminary": "O", "olddatum": false }, { "occurredTime": "1961-06-04T00:00:00Z", "stage": 4.32, "flow": 3670, "preliminary": "O", "olddatum": false }, { "occurredTime": "1960-06-04T00:00:00Z", "stage": 4.92, "flow": 4940, "preliminary": "O", "olddatum": false }, { "occurredTime": "1959-06-15T00:00:00Z", "stage": 6.23, "flow": 7230, "preliminary": "O", "olddatum": false }, { "occurredTime": "1958-05-24T00:00:00Z", "stage": 5.08, "flow": 5010, "preliminary": "O", "olddatum": false }, { "occurredTime": "1957-06-07T00:00:00Z", "stage": 5.59, "flow": 5970, "preliminary": "O", "olddatum": false }, { "occurredTime": "1956-05-28T00:00:00Z", "stage": 5.57, "flow": 7030, "preliminary": "O", "olddatum": false }, { "occurredTime": "1955-06-16T00:00:00Z", "stage": 4.42, "flow": 4480, "preliminary": "O", "olddatum": false }, { "occurredTime": "1954-06-27T00:00:00Z", "stage": 4.21, "flow": 3790, "preliminary": "O", "olddatum": false }, { "occurredTime": "1953-06-13T00:00:00Z", "stage": 5.28, "flow": 6010, "preliminary": "O", "olddatum": false }, { "occurredTime": "1952-06-06T00:00:00Z", "stage": 5.71, "flow": 6910, "preliminary": "O", "olddatum": false }, { "occurredTime": "1951-05-24T00:00:00Z", "stage": 4.69, "flow": 3940, "preliminary": "O", "olddatum": false }, { "occurredTime": "1950-06-22T00:00:00Z", "stage": 4.89, "flow": 5030, "preliminary": "O", "olddatum": false }, { "occurredTime": "1949-05-17T00:00:00Z", "stage": 4.32, "flow": 4110, "preliminary": "O", "olddatum": false }, { "occurredTime": "1948-06-04T00:00:00Z", "stage": 5.77, "flow": 6740, "preliminary": "O", "olddatum": false }, { "occurredTime": "1947-06-20T00:00:00Z", "stage": 4.96, "flow": 5250, "preliminary": "O", "olddatum": false }, { "occurredTime": "1946-06-06T00:00:00Z", "stage": 4.38, "flow": 4360, "preliminary": "O", "olddatum": false }, { "occurredTime": "1945-06-24T00:00:00Z", "stage": 4.55, "flow": 4450, "preliminary": "O", "olddatum": false }, { "occurredTime": "1944-06-09T00:00:00Z", "stage": 4.07, "flow": 3600, "preliminary": "O", "olddatum": false }, { "occurredTime": "1943-06-19T00:00:00Z", "stage": 5.61, "flow": 6480, "preliminary": "O", "olddatum": false }, { "occurredTime": "1942-06-09T00:00:00Z", "stage": 5.32, "flow": 6050, "preliminary": "O", "olddatum": false }, { "occurredTime": "1941-05-27T00:00:00Z", "stage": 3.74, "flow": 2820, "preliminary": "O", "olddatum": false }, { "occurredTime": "1940-06-13T00:00:00Z", "stage": 4.39, "flow": 3660, "preliminary": "O", "olddatum": false }, { "occurredTime": "1939-05-30T00:00:00Z", "stage": 4.04, "flow": 3170, "preliminary": "O", "olddatum": false }, { "occurredTime": "1938-06-06T00:00:00Z", "stage": 5, "flow": 4550, "preliminary": "O", "olddatum": false }, { "occurredTime": "1937-06-17T00:00:00Z", "stage": 4.22, "flow": 3120, "preliminary": "O", "olddatum": false }, { "occurredTime": "1936-05-15T00:00:00Z", "stage": 4.58, "flow": 3660, "preliminary": "O", "olddatum": false }, { "occurredTime": "1935-06-13T00:00:00Z", "stage": 5.09, "flow": 4340, "preliminary": "O", "olddatum": false }, { "occurredTime": "1934-05-08T00:00:00Z", "stage": 3.03, "flow": 1740, "preliminary": "O", "olddatum": false }, { "occurredTime": "1933-06-13T00:00:00Z", "stage": 5.03, "flow": 4270, "preliminary": "O", "olddatum": false } ] }, "lowWaters": { "historic": [] }, "impacts": [ { "stage": 7.2, "statement": "Small bridge near gallatin gateway and a few homes west of town are beginning to flood." }, { "stage": 7.1, "statement": "Water flows over road connecting two bridges over gallatin river. Three forest service campgrounds flood, including the one at squaw creek." }, { "stage": 7, "statement": "Minor roads in gallatin gateway covered with water." }, { "stage": 6.3, "statement": "Water flows over the axtell and irwin bridges." }, { "stage": 6.1, "statement": "Flooding of the lowlands along the gallatin river." }, { "stage": 6, "statement": "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." }, { "stage": 5, "statement": "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." } ] }, "images": { "probability": { "weekint": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/GLGM8.SSTG.prob.weekint.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/GLGM8.QINE.prob.weekint.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/GLGM8.volume.prob.weekint.gif" }, "entperiod": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/GLGM8.SSTG.exceed.90day.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/GLGM8.QINE.exceed.90day.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/GLGM8.volume.exceed.90day.gif" }, "shortrange": "https://water.noaa.gov/resources/probabilistic/short_term/GLGM8.shortrange.hefs.png" }, "hydrograph": { "default": "https://water.noaa.gov/resources/hydrographs/glgm8_hg.png", "floodcat": "https://water.noaa.gov/resources/hydrographs/glgm8_record.png" }, "photos": [ { "id": "4461974938516197870", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 45.497222222222, -111.27083333333 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/glgm8/4461974938516197870.jpeg", "caption": "Looking upstream from gauge house" } }, { "id": "4481970764353114606", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 45.497222222222, -111.27083333333 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/glgm8/4481970764353114606.jpeg", "caption": "Looking downstream from gauge house" } } ] }, "dataAttribution": [ { "abbrev": "US Geological Survey", "text": "USGS--Water Resources of the United States", "title": "US Geological Survey", "url": "http://waterdata.usgs.gov/nwis/rt" }, { "abbrev": "USGS", "text": "06043500", "title": "Observations courtesy of U.S. Geological Survey", "url": "https://waterdata.usgs.gov/nwis/inventory/?site_no=06043500" } ], "impactsLowWaters": [], "normalThreshold": { "value": 0, "units": "ft" }, "hydronotes": [ { "statement": "Stage may be affected by ice during winter months.", "effective": "0101", "expiration": "1231" }, { "statement": "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.", "effective": "0101", "expiration": "1231" } ], "datums": { "vertical": { "value": [ { "label": "National Geodetic Vertical Datum of 1929", "abbrev": "NGVD29", "description": "A fixed reference adopted as a standard geodetic datum for elevations determined by leveling. The datum was derived for surveys from a general adjustment of the first-order leveling nets of both the United States and Canada. In the adjustment, mean sea level was held fixed as observed at 21 tide stations in the United States and 5 in Canada. The year indicates the time of the general adjustment. A synonym for Sea-level Datum of 1929. The geodetic datum is fixed and does not take into account the changing stands of sea level. Because there are many variables affecting sea level, and because the geodetic datum represents a best fit over a broad area, the relationship between the geodetic datum and local mean sea level is not consistent from one location to another in either time or space. For this reason, the National Geodetic Vertical Datum should not be confused with mean sea level. See North American Vertical Datum of 1988 (NAVD 88). NGVD 29 should not be used as Mean Sea Level. NGVD 29 is no longer supported by NGS.", "value": 5167.67 } ] }, "horizontal": { "value": [] }, "notes": { "value": [] } }, "inundation": { "enabled": false, "url": "", "zeroDatum": null, "downloads": null, "siteSpecificInfo": "", "dataAttribution": [] }, "upstreamLid": "", "downstreamLid": "LOGM8", "inService": { "enabled": true, "message": "" }, "lowThreshold": null, "forecastReliability": "Forecasts are issued routinely during the warm season, and as needed at other times of the year.", "TruncateObs": "-1", "TruncateFcst": "-1", "ObservedFloodCategory": "no_flooding", "ForecastFloodCategory": "fcst_not_current" }