{ "lid": "RRTN4", "usgsId": "01400000", "reachId": "9513840", "name": "North Branch Raritan River near Raritan", "description": "", "rfc": { "abbreviation": "MARFC", "name": "Middle Atlantic River Forecast Center" }, "wfo": { "abbreviation": "PHI", "name": "Mount Holly" }, "state": { "abbreviation": "NJ", "name": "New Jersey" }, "county": "Somerset", "timeZone": "EST5EDT", "latitude": 40.570555555556, "longitude": -74.679166666667, "pedts": { "observed": "HGIRG", "forecast": "HGIFF" }, "status": { "observed": { "primary": 2.82, "primaryUnit": "ft", "secondary": 0.153, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-09-19T02:00:00Z" }, "forecast": { "primary": 4.9, "primaryUnit": "ft", "secondary": 2.39, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-09-21T12:00:00Z" } }, "flood": { "stageUnits": "ft", "flowUnits": "cfs", "categories": { "major": { "stage": 15, "flow": -9999 }, "moderate": { "stage": 12, "flow": -9999 }, "minor": { "stage": 10, "flow": -9999 }, "action": { "stage": 8, "flow": 4999 } }, "lro": { "minorCS": "0.15", "moderateCS": "0.07", "majorCS": "< 0.05", "producedTime": "2026-08-28T23:22:47Z", "interval": "SON" }, "crests": { "historic": [ { "occurredTime": "2021-09-02T08:30:00Z", "stage": 19.52, "flow": 33980, "preliminary": "R", "olddatum": false }, { "occurredTime": "1999-09-16T00:00:00Z", "stage": 18.98, "flow": 29000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-08-28T15:30:00Z", "stage": 17.97, "flow": 40600, "preliminary": "O", "olddatum": false }, { "occurredTime": "1971-08-28T00:00:00Z", "stage": 15.47, "flow": 28600, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-10-19T23:30:00Z", "stage": 15.44, "flow": 28500, "preliminary": "O", "olddatum": false }, { "occurredTime": "1984-07-07T00:00:00Z", "stage": 15.3, "flow": 27900, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-01-19T22:00:00Z", "stage": 14.3, "flow": 23700, "preliminary": "O", "olddatum": false }, { "occurredTime": "2024-01-10T12:00:00Z", "stage": 14.1, "flow": 15200, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-03-14T08:15:00Z", "stage": 13.9, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1955-08-19T00:00:00Z", "stage": 13.59, "flow": 20700, "preliminary": "O", "olddatum": false }, { "occurredTime": "2023-12-18T18:45:00Z", "stage": 13.54, "flow": 13680, "preliminary": "O", "olddatum": false }, { "occurredTime": "2014-05-01T06:45:00Z", "stage": 13.29, "flow": 13070, "preliminary": "O", "olddatum": false }, { "occurredTime": "2007-04-16T02:30:00Z", "stage": 13.2, "flow": 19400, "preliminary": "O", "olddatum": false }, { "occurredTime": "1955-08-13T00:00:00Z", "stage": 12.7, "flow": 17400, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-09-08T18:15:00Z", "stage": 12.7, "flow": 17400, "preliminary": "O", "olddatum": false }, { "occurredTime": "1955-10-15T00:00:00Z", "stage": 12.68, "flow": 17300, "preliminary": "O", "olddatum": false }, { "occurredTime": "1938-09-21T00:00:00Z", "stage": 12.16, "flow": 16500, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-07-23T00:00:00Z", "stage": 11.95, "flow": 14600, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-08-23T17:45:00Z", "stage": 11.88, "flow": 9798, "preliminary": "O", "olddatum": false }, { "occurredTime": "1979-01-25T00:00:00Z", "stage": 11.87, "flow": 15100, "preliminary": "O", "olddatum": false }, { "occurredTime": "2023-12-28T16:00:00Z", "stage": 11.78, "flow": 9588, "preliminary": "O", "olddatum": false }, { "occurredTime": "1942-08-09T00:00:00Z", "stage": 11.78, "flow": 15500, "preliminary": "O", "olddatum": false }, { "occurredTime": "1982-02-03T00:00:00Z", "stage": 11.68, "flow": 14500, "preliminary": "O", "olddatum": false }, { "occurredTime": "1983-04-16T00:00:00Z", "stage": 11.59, "flow": 14200, "preliminary": "O", "olddatum": false }, { "occurredTime": "1936-01-03T00:00:00Z", "stage": 11.35, "flow": 14400, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-04-17T10:30:00Z", "stage": 11.15, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1984-04-05T00:00:00Z", "stage": 10.79, "flow": 11900, "preliminary": "O", "olddatum": false }, { "occurredTime": "2023-07-10T09:15:00Z", "stage": 10.64, "flow": 7362, "preliminary": "O", "olddatum": false }, { "occurredTime": "2018-11-25T15:30:00Z", "stage": 10.51, "flow": 7137, "preliminary": "O", "olddatum": false }, { "occurredTime": "2005-04-03T03:45:00Z", "stage": 10.34, "flow": 9690, "preliminary": "O", "olddatum": false }, { "occurredTime": "1972-06-22T00:00:00Z", "stage": 10.22, "flow": 10400, "preliminary": "O", "olddatum": false }, { "occurredTime": "1994-01-29T01:15:00Z", "stage": 10.19, "flow": 10000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2003-12-11T17:00:00Z", "stage": 10.16, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2022-04-08T08:00:00Z", "stage": 10.13, "flow": 6525, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-03-07T12:00:00Z", "stage": 10.01, "flow": 8836, "preliminary": "O", "olddatum": false }, { "occurredTime": "1999-03-22T09:00:00Z", "stage": 9.72, "flow": 8990, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-12-02T11:30:00Z", "stage": 9.64, "flow": 8770, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-03-11T13:15:00Z", "stage": 9.54, "flow": 7692, "preliminary": "O", "olddatum": false }, { "occurredTime": "2002-05-14T05:00:00Z", "stage": 9.25, "flow": 7730, "preliminary": "O", "olddatum": false }, { "occurredTime": "1993-12-05T00:00:00Z", "stage": 9.22, "flow": 7670, "preliminary": "O", "olddatum": false }, { "occurredTime": "1994-03-10T00:00:00Z", "stage": 9.15, "flow": 7520, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-07-13T00:00:00Z", "stage": 8.36, "flow": 5840, "preliminary": "O", "olddatum": false }, { "occurredTime": "1998-04-10T07:15:00Z", "stage": 8.06, "flow": 5110, "preliminary": "O", "olddatum": false } ], "recent": [ { "occurredTime": "2024-01-10T12:00:00Z", "stage": 14.1, "flow": 15200, "preliminary": "O", "olddatum": false }, { "occurredTime": "2023-12-28T16:00:00Z", "stage": 11.78, "flow": 9588, "preliminary": "O", "olddatum": false }, { "occurredTime": "2023-12-18T18:45:00Z", "stage": 13.54, "flow": 13680, "preliminary": "O", "olddatum": false }, { "occurredTime": "2023-07-10T09:15:00Z", "stage": 10.64, "flow": 7362, "preliminary": "O", "olddatum": false }, { "occurredTime": "2022-04-08T08:00:00Z", "stage": 10.13, "flow": 6525, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-09-02T08:30:00Z", "stage": 19.52, "flow": 33980, "preliminary": "R", "olddatum": false }, { "occurredTime": "2021-08-23T17:45:00Z", "stage": 11.88, "flow": 9798, "preliminary": "O", "olddatum": false }, { "occurredTime": "2018-11-25T15:30:00Z", "stage": 10.51, "flow": 7137, "preliminary": "O", "olddatum": false }, { "occurredTime": "2014-05-01T06:45:00Z", "stage": 13.29, "flow": 13070, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-09-08T18:15:00Z", "stage": 12.7, "flow": 17400, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-08-28T15:30:00Z", "stage": 17.97, "flow": 40600, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-04-17T10:30:00Z", "stage": 11.15, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-03-11T13:15:00Z", "stage": 9.54, "flow": 7692, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-03-07T12:00:00Z", "stage": 10.01, "flow": 8836, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-03-14T08:15:00Z", "stage": 13.9, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2007-04-16T02:30:00Z", "stage": 13.2, "flow": 19400, "preliminary": "O", "olddatum": false }, { "occurredTime": "2005-04-03T03:45:00Z", "stage": 10.34, "flow": 9690, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-07-23T00:00:00Z", "stage": 11.95, "flow": 14600, "preliminary": "O", "olddatum": false }, { "occurredTime": "2003-12-11T17:00:00Z", "stage": 10.16, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2002-05-14T05:00:00Z", "stage": 9.25, "flow": 7730, "preliminary": "O", "olddatum": false }, { "occurredTime": "1999-09-16T00:00:00Z", "stage": 18.98, "flow": 29000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1999-03-22T09:00:00Z", "stage": 9.72, "flow": 8990, "preliminary": "O", "olddatum": false }, { "occurredTime": "1998-04-10T07:15:00Z", "stage": 8.06, "flow": 5110, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-12-02T11:30:00Z", "stage": 9.64, "flow": 8770, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-10-19T23:30:00Z", "stage": 15.44, "flow": 28500, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-07-13T00:00:00Z", "stage": 8.36, "flow": 5840, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-01-19T22:00:00Z", "stage": 14.3, "flow": 23700, "preliminary": "O", "olddatum": false }, { "occurredTime": "1994-03-10T00:00:00Z", "stage": 9.15, "flow": 7520, "preliminary": "O", "olddatum": false }, { "occurredTime": "1994-01-29T01:15:00Z", "stage": 10.19, "flow": 10000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1993-12-05T00:00:00Z", "stage": 9.22, "flow": 7670, "preliminary": "O", "olddatum": false }, { "occurredTime": "1984-07-07T00:00:00Z", "stage": 15.3, "flow": 27900, "preliminary": "O", "olddatum": false }, { "occurredTime": "1984-04-05T00:00:00Z", "stage": 10.79, "flow": 11900, "preliminary": "O", "olddatum": false }, { "occurredTime": "1983-04-16T00:00:00Z", "stage": 11.59, "flow": 14200, "preliminary": "O", "olddatum": false }, { "occurredTime": "1982-02-03T00:00:00Z", "stage": 11.68, "flow": 14500, "preliminary": "O", "olddatum": false }, { "occurredTime": "1979-01-25T00:00:00Z", "stage": 11.87, "flow": 15100, "preliminary": "O", "olddatum": false }, { "occurredTime": "1972-06-22T00:00:00Z", "stage": 10.22, "flow": 10400, "preliminary": "O", "olddatum": false }, { "occurredTime": "1971-08-28T00:00:00Z", "stage": 15.47, "flow": 28600, "preliminary": "O", "olddatum": false }, { "occurredTime": "1955-10-15T00:00:00Z", "stage": 12.68, "flow": 17300, "preliminary": "O", "olddatum": false }, { "occurredTime": "1955-08-19T00:00:00Z", "stage": 13.59, "flow": 20700, "preliminary": "O", "olddatum": false }, { "occurredTime": "1955-08-13T00:00:00Z", "stage": 12.7, "flow": 17400, "preliminary": "O", "olddatum": false }, { "occurredTime": "1942-08-09T00:00:00Z", "stage": 11.78, "flow": 15500, "preliminary": "O", "olddatum": false }, { "occurredTime": "1938-09-21T00:00:00Z", "stage": 12.16, "flow": 16500, "preliminary": "O", "olddatum": false }, { "occurredTime": "1936-01-03T00:00:00Z", "stage": 11.35, "flow": 14400, "preliminary": "O", "olddatum": false } ] }, "lowWaters": { "historic": [] }, "impacts": [ { "stage": 20, "statement": "US Route 202 is closed. Flooding extends west of Vanderveer Avenue to Burnt Mill Road." }, { "stage": 19, "statement": "The bridge on Old York Road between Branchburg and Bridgewater is closed due to flooding." }, { "stage": 18, "statement": "Helfreds Landing in Bridgewater floods." }, { "stage": 15, "statement": "US Route 202 in Branchburg begins to flood, starting with the northbound lanes. Chambers Brook experiences back water causing flooding to occur along Chambers Brook Road." }, { "stage": 14, "statement": "The first evacuations begin in Branchburg near Route 28 and Vaanderveer Avenue." }, { "stage": 12, "statement": "Vaanderveer Avenue in Branchburg begins to flood." }, { "stage": 10, "statement": "Flooding begins along Old York Road and in Branchburg." }, { "stage": 8, "statement": "North Branch Park floods." } ] }, "images": { "probability": { "weekint": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/RRTN4.SSTG.prob.weekint.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/RRTN4.QINE.prob.weekint.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/RRTN4.volume.prob.weekint.gif" }, "entperiod": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/RRTN4.SSTG.exceed.90day.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/RRTN4.QINE.exceed.90day.gif", "volume": "" }, "shortrange": "https://water.noaa.gov/resources/probabilistic/short_term/RRTN4.shortrange.hefs.png" }, "hydrograph": { "default": "https://water.noaa.gov/resources/hydrographs/rrtn4_hg.png", "floodcat": "https://water.noaa.gov/resources/hydrographs/rrtn4_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/nwis" }, { "abbrev": "USGS", "text": "01400000", "title": "Observations courtesy of U.S. Geological Survey", "url": "https://waterdata.usgs.gov/nwis/inventory/?site_no=01400000" } ], "impactsLowWaters": [], "normalThreshold": { "value": 0, "units": "ft" }, "hydronotes": [ { "statement": "NEW! Click Here for Partner Flood Inundation Maps for North Branch Raritan River near Raritan", "effective": "0101", "expiration": "1212" } ], "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": 50.43 } ] }, "horizontal": { "value": [] }, "notes": { "value": [] } }, "inundation": { "enabled": false, "url": "", "zeroDatum": null, "downloads": null, "siteSpecificInfo": "", "dataAttribution": [] }, "upstreamLid": "NBAN4", "downstreamLid": "SBRN4", "inService": { "enabled": true, "message": "" }, "lowThreshold": { "units": "ft", "value": 0 }, "forecastReliability": "Forecasts are issued routinely year-round.", "TruncateObs": "-1", "TruncateFcst": "3", "ObservedFloodCategory": "no_flooding", "ForecastFloodCategory": "no_flooding" }