{ "lid": "CPHT1", "usgsId": "", "reachId": "19669347", "name": "Toccoa River (GA) / Ocoee River (TN) at Copperhill", "description": "COPPERHILL TN", "rfc": { "abbreviation": "LMRFC", "name": "Lower Mississippi River Forecast Center" }, "wfo": { "abbreviation": "MRX", "name": "Morristown" }, "state": { "abbreviation": "TN", "name": "Tennessee" }, "county": "Polk", "timeZone": "EST5EDT", "latitude": 34.991388888889, "longitude": -84.376666666667, "pedts": { "observed": "HGIRG", "forecast": "HGIFF" }, "status": { "observed": { "primary": 17.73, "primaryUnit": "ft", "secondary": -999, "secondaryUnit": "kcfs", "floodCategory": "major", "validTime": "2026-11-05T10:30:00Z" }, "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": 14, "flow": -9999 }, "moderate": { "stage": 12, "flow": -9999 }, "minor": { "stage": 8, "flow": -9999 }, "action": { "stage": 6, "flow": -9999 } }, "lro": { "minorCS": "< 0.05", "moderateCS": "< 0.05", "majorCS": "< 0.05", "producedTime": "2026-11-03T20:46:37Z", "interval": "NDJ" }, "crests": { "historic": [ { "occurredTime": "1990-02-16T00:00:00Z", "stage": 17.75, "flow": 33500, "preliminary": "R", "olddatum": false }, { "occurredTime": "1996-01-27T00:00:00Z", "stage": 9.85, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1951-03-29T00:00:00Z", "stage": 9.83, "flow": 10500, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-12-24T00:00:00Z", "stage": 9.61, "flow": 12550, "preliminary": "O", "olddatum": false }, { "occurredTime": "1964-10-04T00:00:00Z", "stage": 9.42, "flow": 11900, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-03-26T03:00:00Z", "stage": 9.37, "flow": 9990, "preliminary": "O", "olddatum": false }, { "occurredTime": "2020-02-06T15:15:00Z", "stage": 9.15, "flow": 9630, "preliminary": "O", "olddatum": false }, { "occurredTime": "1946-02-10T00:00:00Z", "stage": 9, "flow": 12100, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-12-02T15:15:00Z", "stage": 8.79, "flow": 11000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-09-17T00:00:00Z", "stage": 8.59, "flow": 13250, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-03-31T13:15:00Z", "stage": 7.79, "flow": 7560, "preliminary": "O", "olddatum": false }, { "occurredTime": "2024-01-09T13:45:00Z", "stage": 7.49, "flow": 7130, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-03-03T19:45:00Z", "stage": 6.69, "flow": 5850, "preliminary": "O", "olddatum": false }, { "occurredTime": "2018-03-01T04:45:00Z", "stage": 6.52, "flow": 5610, "preliminary": "O", "olddatum": false } ], "recent": [ { "occurredTime": "2024-01-09T13:45:00Z", "stage": 7.49, "flow": 7130, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-03-31T13:15:00Z", "stage": 7.79, "flow": 7560, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-03-26T03:00:00Z", "stage": 9.37, "flow": 9990, "preliminary": "O", "olddatum": false }, { "occurredTime": "2020-02-06T15:15:00Z", "stage": 9.15, "flow": 9630, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-03-03T19:45:00Z", "stage": 6.69, "flow": 5850, "preliminary": "O", "olddatum": false }, { "occurredTime": "2018-03-01T04:45:00Z", "stage": 6.52, "flow": 5610, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-12-24T00:00:00Z", "stage": 9.61, "flow": 12550, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-12-02T15:15:00Z", "stage": 8.79, "flow": 11000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-09-17T00:00:00Z", "stage": 8.59, "flow": 13250, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-01-27T00:00:00Z", "stage": 9.85, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1990-02-16T00:00:00Z", "stage": 17.75, "flow": 33500, "preliminary": "R", "olddatum": false }, { "occurredTime": "1964-10-04T00:00:00Z", "stage": 9.42, "flow": 11900, "preliminary": "O", "olddatum": false }, { "occurredTime": "1951-03-29T00:00:00Z", "stage": 9.83, "flow": 10500, "preliminary": "O", "olddatum": false }, { "occurredTime": "1946-02-10T00:00:00Z", "stage": 9, "flow": 12100, "preliminary": "O", "olddatum": false } ] }, "lowWaters": { "historic": [] }, "impacts": [ { "stage": 16, "statement": "A catastrophic flood event affecting much of the infrastructure in Copperhill Tennessee and McCaysville Georgia. Numerous homes, businesses, and roads will be flooded with several feet of water. Transportation between the two towns will be cutoff as both bridges will be topped. Massive evacuations will be needed. River Road and the Horsebend Park and its facilities will be completely flooded." }, { "stage": 14, "statement": "Major flooding occurs with widespread inundation along the river in Copperhill Tennessee and McCaysville Georgia. Numerous homes, businesses, the Copperhill Post Office and Ocoee Street will be flooded. Evacuations will be needed. The Georgia Highway 5 bridge will be topped. The Bridge Street bridge will form an obstacle and act like a dam causing some backwater and erosion eddies to the sides of the bridge. Officials will likely close the bridge. The Horsebend Park and its facilities will be flooded." }, { "stage": 13, "statement": "Moderate flooding expands in areas along the river in Copperhill Tennessee and McCaysville Georgia. The flood waters will reach foundations of homes, businesses and affect portions of Ocoee Street, including the Copperhill Post Office. Some evacuations may be needed. The Georgia Highway 5 bridge will form an obstacle and act like a dam causing some backwater and erosion eddies to the sides of the bridge. Officials will likely close the bridge. The Horsebend Park including the restrooms will be flooded." }, { "stage": 12, "statement": "Moderate flooding begins and expands further into the woodlands and fields along the river in Copperhill Tennessee and McCaysville Georgia. The flood waters will approach foundations of homes and businesses. The parking lot behind the Copperhill Tennessee Post Office will be under one to two feet of water. The flood waters will begin to reach portions of Ocoee Street and the bottom of the Georgia Highway 5 bridge. Large portions of the Horsebend Park and parking lot will be flooded." }, { "stage": 10, "statement": "Minor flooding expands into woodlands, fields, and backyards of homes near the river. The rock access road to the gage will be under two feet of water. Portions of parking lots near the river will begin to flood behind the Copperhill Tennessee Post Office and other businesses along Ocoee Street. Also flooding expands into the backyards of homes and the Horsebend Park in McCaysville Georgia." }, { "stage": 8, "statement": "Flood stage is reached. Minor flooding begins of woodlands, fields and backyards of homes near the river upstream and downstream from the gage off Tennessee Highway 68 or Ocoee Street in Copperhill Tennessee. The rock access road to the gage will begin to flood. Flooding begins in the backyards of homes and the Horsebend Park in McCaysville Georgia." }, { "stage": 6, "statement": "Bankfull conditions are reached along the river upstream and downstream from the gage off of Tennessee Highway 68 or Ocoee Street in west Copperhill Tennessee. This includes low lying portions of the Horsebend Park in McCaysville Georgia." } ] }, "images": { "probability": { "weekint": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/CPHT1.SSTG.prob.weekint.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/CPHT1.QINE.prob.weekint.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/CPHT1.volume.prob.weekint.gif" }, "entperiod": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/CPHT1.SSTG.exceed.90day.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/CPHT1.QINE.exceed.90day.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/CPHT1.volume.exceed.90day.gif" }, "shortrange": "" }, "hydrograph": { "default": "https://water.noaa.gov/resources/hydrographs/cpht1_hg.png", "floodcat": "https://water.noaa.gov/resources/hydrographs/cpht1_record.png" }, "photos": [] }, "dataAttribution": [ { "abbrev": "US Geological Survey", "text": "USGS--Water Resources of the United States", "title": "Observations courtesy of U.S. Geological Survey", "url": "https://waterdata.usgs.gov/monitoring-location/03559500/" } ], "impactsLowWaters": [], "normalThreshold": { "value": 0, "units": "ft" }, "hydronotes": [ { "statement": "River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.", "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": 1445.1 }, { "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": 1445.28 } ] }, "horizontal": { "value": [] }, "notes": { "value": [] } }, "inundation": { "enabled": false, "url": "", "zeroDatum": null, "downloads": null, "siteSpecificInfo": "", "dataAttribution": [] }, "upstreamLid": "BRDG1", "downstreamLid": "OCCT1", "inService": { "enabled": true, "message": "" }, "lowThreshold": null, "forecastReliability": "Forecasts are issued as needed during times of high water, but are not routinely available.", "TruncateObs": "-1", "TruncateFcst": "-1", "ObservedFloodCategory": "major", "ForecastFloodCategory": "fcst_not_current" }