{ "lid": "GNUK2", "usgsId": "03216600", "reachId": "465518", "name": "Ohio River at Lloyd Greenup Lock", "description": "1968 to Present", "rfc": { "abbreviation": "OHRFC", "name": "Ohio River Forecast Center" }, "wfo": { "abbreviation": "RLX", "name": "South Charleston" }, "state": { "abbreviation": "KY", "name": "Kentucky" }, "county": "Greenup", "timeZone": "EST5EDT", "latitude": 38.6466666666667, "longitude": -82.8605555555555, "pedts": { "observed": "HTIRG", "forecast": "HTIFF" }, "status": { "observed": { "primary": 16.35, "primaryUnit": "ft", "secondary": -999, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-08-31T01:45:00Z" }, "forecast": { "primary": 14.4, "primaryUnit": "ft", "secondary": -999, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-08-31T06:00:00Z" } }, "flood": { "stageUnits": "ft", "flowUnits": "cfs", "categories": { "major": { "stage": 62, "flow": -9999 }, "moderate": { "stage": 56, "flow": -9999 }, "minor": { "stage": 54, "flow": -9999 }, "action": { "stage": 52, "flow": -9999 } }, "lro": { "minorCS": "< 0.05", "moderateCS": "< 0.05", "majorCS": "< 0.05", "producedTime": "2026-08-29T03:30:05Z", "interval": "SON" }, "crests": { "historic": [ { "occurredTime": "1937-01-27T00:00:00Z", "stage": 74.7, "flow": 0, "preliminary": "R", "olddatum": true }, { "occurredTime": "1913-03-31T00:00:00Z", "stage": 64.5, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1884-02-12T00:00:00Z", "stage": 64, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1997-03-04T21:00:00Z", "stage": 62.3, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1945-03-09T00:00:00Z", "stage": 61.7, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1978-12-11T00:00:00Z", "stage": 59.2, "flow": 534000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1979-02-28T00:00:00Z", "stage": 59.19, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-03-03T20:30:00Z", "stage": 57.99, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2018-02-20T01:00:00Z", "stage": 57.14, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-03-13T10:00:00Z", "stage": 56.8, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-03-13T13:00:00Z", "stage": 56.8, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2005-01-10T07:00:00Z", "stage": 56.64, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2005-01-09T23:00:00Z", "stage": 56.4, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1991-01-02T13:00:00Z", "stage": 56.04, "flow": 481000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2025-02-18T20:30:00Z", "stage": 55.58, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-01-22T11:00:00Z", "stage": 55.3, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1974-01-13T12:00:00Z", "stage": 55, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2020-02-15T01:00:00Z", "stage": 54.94, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2025-04-07T04:30:00Z", "stage": 54.9, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-03-07T10:00:00Z", "stage": 54.8, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-03-14T21:30:00Z", "stage": 54.72, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-03-07T04:30:00Z", "stage": 54.21, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1977-04-07T00:00:00Z", "stage": 53.77, "flow": 478000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1985-11-30T00:00:00Z", "stage": 53.71, "flow": 454000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2003-02-25T18:00:00Z", "stage": 52.16, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2018-12-24T16:00:00Z", "stage": 51.84, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1993-03-26T00:00:00Z", "stage": 50.57, "flow": 420000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2013-02-03T00:30:00Z", "stage": 50.01, "flow": 0, "preliminary": "O", "olddatum": false } ], "recent": [ { "occurredTime": "2025-04-07T04:30:00Z", "stage": 54.9, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2025-02-18T20:30:00Z", "stage": 55.58, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-03-03T20:30:00Z", "stage": 57.99, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2020-02-15T01:00:00Z", "stage": 54.94, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2018-12-24T16:00:00Z", "stage": 51.84, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2018-02-20T01:00:00Z", "stage": 57.14, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-03-14T21:30:00Z", "stage": 54.72, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-03-07T10:00:00Z", "stage": 54.8, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-03-07T04:30:00Z", "stage": 54.21, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2013-02-03T00:30:00Z", "stage": 50.01, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-03-13T10:00:00Z", "stage": 56.8, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-03-13T13:00:00Z", "stage": 56.8, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2005-01-10T07:00:00Z", "stage": 56.64, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2005-01-09T23:00:00Z", "stage": 56.4, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2003-02-25T18:00:00Z", "stage": 52.16, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1997-03-04T21:00:00Z", "stage": 62.3, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-01-22T11:00:00Z", "stage": 55.3, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1993-03-26T00:00:00Z", "stage": 50.57, "flow": 420000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1991-01-02T13:00:00Z", "stage": 56.04, "flow": 481000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1985-11-30T00:00:00Z", "stage": 53.71, "flow": 454000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1979-02-28T00:00:00Z", "stage": 59.19, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1978-12-11T00:00:00Z", "stage": 59.2, "flow": 534000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1977-04-07T00:00:00Z", "stage": 53.77, "flow": 478000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1974-01-13T12:00:00Z", "stage": 55, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1945-03-09T00:00:00Z", "stage": 61.7, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1937-01-27T00:00:00Z", "stage": 74.7, "flow": 0, "preliminary": "R", "olddatum": true }, { "occurredTime": "1913-03-31T00:00:00Z", "stage": 64.5, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1884-02-12T00:00:00Z", "stage": 64, "flow": 0, "preliminary": "O", "olddatum": false } ] }, "lowWaters": { "historic": [ { "occurredTime": "1978-09-25T00:00:00Z", "stage": -9999, "flow": 4930, "statement": "Record minimum flow." } ] }, "impacts": [ { "stage": 74.7, "statement": "This flood will exceed the highest stage on record. Large amounts of property damage is expected. Evacuation of homes and businesses will be required." }, { "stage": 69, "statement": "Highest ground in Greenup is flooded. Route 23 is closed." }, { "stage": 68, "statement": "Water enters 90% of residental area of Greenup. CSX Railroad is closed in all parts of Greenup." }, { "stage": 67, "statement": "Berry Street in Greenup is flooded." }, { "stage": 66, "statement": "Womeck Cemetery is flooded." }, { "stage": 65, "statement": "Backwater flooding into Raccoon Creek begins." }, { "stage": 64, "statement": "CSX Railroad is closed on east side of Greenup." }, { "stage": 62, "statement": "Water enters Greenup High School." }, { "stage": 56, "statement": "Several low lying areas flooded and backwater affected on both sides of the river." }, { "stage": 54, "statement": "This will cause minor flooding of mainly low-lying areas. Backwater flooding starts on both sides of the river." } ] }, "images": { "probability": { "weekint": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/GNUK2.SSTG.prob.weekint.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/GNUK2.QINE.prob.weekint.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/GNUK2.volume.prob.weekint.gif" }, "entperiod": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/GNUK2.SSTG.exceed.90day.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/GNUK2.QINE.exceed.90day.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/GNUK2.volume.exceed.90day.gif" }, "shortrange": "https://water.noaa.gov/resources/probabilistic/short_term/GNUK2.shortrange.hefs.png" }, "hydrograph": { "default": "https://water.noaa.gov/resources/hydrographs/gnuk2_hg.png", "floodcat": "https://water.noaa.gov/resources/hydrographs/gnuk2_record.png" }, "photos": [] }, "dataAttribution": [ { "abbrev": "US Geological Survey", "text": "USGS--Water Resources of the United States", "title": "US Geological Survey", "url": "https://waterdata.usgs.gov/monitoring-location/03216600" }, { "abbrev": "USGS", "text": "03216600", "title": "Observations courtesy of U.S. Geological Survey", "url": "https://waterdata.usgs.gov/nwis/inventory/?site_no=03216600" } ], "impactsLowWaters": [], "normalThreshold": { "value": 12.5, "units": "ft" }, "hydronotes": [ { "statement": "River Forecasts typically include ONLY 2 days of future rain from forecast issuance time (lower right of graph). Occasionally 3 days of future rain included.", "effective": "0101", "expiration": "1231" } ], "datums": { "vertical": { "value": [ { "label": "North American Vertical Datum of 1988", "abbrev": "NAVD88", "description": "A fixed reference for elevations determined by geodetic leveling. The datum was derived from a general adjustment of the first-order terrestrial leveling nets of the United States, Canada, and Mexico. In the adjustment, only the height of the primary tidal bench mark, referenced to the International Great Lakes Datum of 1985 (IGLD 85) local mean sea level height value, at Father Point, Rimouski, Quebec, Canada was held fixed, thus providing minimum constraint. NAVD 88 and IGLD 85 are identical. However, NAVD 88 bench mark values are given in Helmert orthometric height units while IGLD 85 values are in dynamic heights. See International Great Lakes Datum of 1985, National Geodetic Vertical Datum of 1929, and geopotential difference. NAVD 88 should not be used as Mean Sea Level.", "value": 471.85 }, { "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": 472 } ] }, "horizontal": { "value": [] }, "notes": { "value": [] } }, "inundation": { "enabled": false, "url": "", "zeroDatum": null, "downloads": null, "siteSpecificInfo": "", "dataAttribution": [] }, "upstreamLid": "IROO1", "downstreamLid": "PORO1", "inService": { "enabled": true, "message": "" }, "lowThreshold": null, "forecastReliability": "Forecasts are issued routinely year-round.", "TruncateObs": "-1", "TruncateFcst": "5", "ObservedFloodCategory": "no_flooding", "ForecastFloodCategory": "no_flooding" }