{ "lid": "WTRS2", "usgsId": "06479438", "reachId": "9370962", "name": "Big Sioux River near Watertown", "description": "", "rfc": { "abbreviation": "MBRFC", "name": "Missouri Basin River Forecast Center" }, "wfo": { "abbreviation": "ABR", "name": "Aberdeen" }, "state": { "abbreviation": "SD", "name": "South Dakota" }, "county": "Codington", "timeZone": "CST6CDT", "latitude": 45.006111111111, "longitude": -97.164722222222, "pedts": { "observed": "HGIRG", "forecast": "HGIFF" }, "status": { "observed": { "primary": 4.3, "primaryUnit": "ft", "secondary": 0.039, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-11-14T07:00:00Z" }, "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": 12, "flow": -9999 }, "moderate": { "stage": 11, "flow": -9999 }, "minor": { "stage": 10, "flow": -9999 }, "action": { "stage": 9, "flow": -9999 } }, "lro": { "minorCS": "< 0.05", "moderateCS": "< 0.05", "majorCS": "< 0.05", "producedTime": "2026-10-21T22:05:04Z", "interval": "NDJ" }, "crests": { "historic": [ { "occurredTime": "2001-04-07T00:00:00Z", "stage": 12.33, "flow": 8000, "preliminary": "R", "olddatum": false }, { "occurredTime": "1997-04-05T00:00:00Z", "stage": 12.09, "flow": 7820, "preliminary": "O", "olddatum": false }, { "occurredTime": "2023-04-13T00:00:00Z", "stage": 11.85, "flow": 6450, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-03-28T00:00:00Z", "stage": 11.21, "flow": 3390, "preliminary": "O", "olddatum": false }, { "occurredTime": "1991-06-21T00:00:00Z", "stage": 11.13, "flow": 3300, "preliminary": "O", "olddatum": true }, { "occurredTime": "1986-03-30T00:00:00Z", "stage": 11.08, "flow": 4970, "preliminary": "O", "olddatum": true }, { "occurredTime": "1978-03-30T00:00:00Z", "stage": 11.07, "flow": 3720, "preliminary": "O", "olddatum": false }, { "occurredTime": "1993-03-28T00:00:00Z", "stage": 11.07, "flow": 4000, "preliminary": "O", "olddatum": true }, { "occurredTime": "1996-03-14T00:00:00Z", "stage": 10.67, "flow": 2500, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-03-15T00:00:00Z", "stage": 10.66, "flow": 2310, "preliminary": "O", "olddatum": false }, { "occurredTime": "2025-08-06T00:00:00Z", "stage": 10.61, "flow": 1550, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-03-23T00:00:00Z", "stage": 10.3, "flow": 2380, "preliminary": "O", "olddatum": false }, { "occurredTime": "2022-05-31T00:00:00Z", "stage": 10.11, "flow": 2080, "preliminary": "O", "olddatum": false }, { "occurredTime": "1994-03-20T00:00:00Z", "stage": 9.86, "flow": 2110, "preliminary": "O", "olddatum": false }, { "occurredTime": "1979-04-13T00:00:00Z", "stage": 9.82, "flow": 1780, "preliminary": "O", "olddatum": false }, { "occurredTime": "2007-03-22T00:00:00Z", "stage": 9.82, "flow": 1950, "preliminary": "O", "olddatum": false }, { "occurredTime": "2014-06-19T00:00:00Z", "stage": 9.82, "flow": 1950, "preliminary": "O", "olddatum": false }, { "occurredTime": "1995-03-12T00:00:00Z", "stage": 9.81, "flow": 2000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1985-03-17T00:00:00Z", "stage": 9.62, "flow": 1700, "preliminary": "O", "olddatum": false }, { "occurredTime": "1984-06-16T00:00:00Z", "stage": 9.25, "flow": 1330, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-10-23T00:00:00Z", "stage": 9.08, "flow": 801, "preliminary": "O", "olddatum": false }, { "occurredTime": "1989-03-27T00:00:00Z", "stage": 8.98, "flow": 900, "preliminary": "O", "olddatum": false }, { "occurredTime": "1982-03-30T00:00:00Z", "stage": 8.97, "flow": 250, "preliminary": "O", "olddatum": false }, { "occurredTime": "2002-03-29T00:00:00Z", "stage": 8.97, "flow": 800, "preliminary": "O", "olddatum": false }, { "occurredTime": "2013-04-28T00:00:00Z", "stage": 8.89, "flow": 1050, "preliminary": "O", "olddatum": false }, { "occurredTime": "1998-05-17T00:00:00Z", "stage": 8.87, "flow": 1140, "preliminary": "O", "olddatum": false }, { "occurredTime": "1977-06-16T00:00:00Z", "stage": 8.77, "flow": 938, "preliminary": "O", "olddatum": false }, { "occurredTime": "1999-10-17T00:00:00Z", "stage": 8.6, "flow": 946, "preliminary": "O", "olddatum": false }, { "occurredTime": "2003-03-17T00:00:00Z", "stage": 8.27, "flow": 250, "preliminary": "O", "olddatum": false }, { "occurredTime": "1973-03-15T00:00:00Z", "stage": 8.11, "flow": 595, "preliminary": "O", "olddatum": false }, { "occurredTime": "1992-07-02T00:00:00Z", "stage": 8.07, "flow": 736, "preliminary": "O", "olddatum": false }, { "occurredTime": "1980-03-19T00:00:00Z", "stage": 8.04, "flow": 330, "preliminary": "O", "olddatum": false }, { "occurredTime": "1987-03-25T00:00:00Z", "stage": 8.01, "flow": 601, "preliminary": "O", "olddatum": false }, { "occurredTime": "2017-09-25T00:00:00Z", "stage": 7.88, "flow": 378, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-03-11T00:00:00Z", "stage": 7.85, "flow": 300, "preliminary": "O", "olddatum": false }, { "occurredTime": "2005-06-14T00:00:00Z", "stage": 7.84, "flow": 565, "preliminary": "O", "olddatum": false }, { "occurredTime": "2006-03-31T00:00:00Z", "stage": 7.76, "flow": 554, "preliminary": "O", "olddatum": false }, { "occurredTime": "1975-04-17T00:00:00Z", "stage": 7.75, "flow": 301, "preliminary": "O", "olddatum": false }, { "occurredTime": "1983-04-02T00:00:00Z", "stage": 7.52, "flow": 396, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-04-10T00:00:00Z", "stage": 7.12, "flow": 402, "preliminary": "O", "olddatum": false }, { "occurredTime": "1976-03-24T00:00:00Z", "stage": 7.07, "flow": 288, "preliminary": "O", "olddatum": false }, { "occurredTime": "1974-04-04T00:00:00Z", "stage": 6.75, "flow": 232, "preliminary": "O", "olddatum": false }, { "occurredTime": "2012-03-13T00:00:00Z", "stage": 6.39, "flow": 267, "preliminary": "O", "olddatum": false }, { "occurredTime": "1988-03-25T00:00:00Z", "stage": 6.26, "flow": 110, "preliminary": "O", "olddatum": false }, { "occurredTime": "1981-06-15T00:00:00Z", "stage": 5.5, "flow": 88, "preliminary": "O", "olddatum": false }, { "occurredTime": "2016-04-27T00:00:00Z", "stage": 4.82, "flow": 89, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-06-02T00:00:00Z", "stage": 4.74, "flow": 75, "preliminary": "O", "olddatum": false }, { "occurredTime": "1990-06-18T00:00:00Z", "stage": 4.56, "flow": 28, "preliminary": "O", "olddatum": false }, { "occurredTime": "2000-04-22T00:00:00Z", "stage": 4.25, "flow": 31, "preliminary": "O", "olddatum": false } ], "recent": [ { "occurredTime": "2025-08-06T00:00:00Z", "stage": 10.61, "flow": 1550, "preliminary": "O", "olddatum": false }, { "occurredTime": "2023-04-13T00:00:00Z", "stage": 11.85, "flow": 6450, "preliminary": "O", "olddatum": false }, { "occurredTime": "2022-05-31T00:00:00Z", "stage": 10.11, "flow": 2080, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-04-10T00:00:00Z", "stage": 7.12, "flow": 402, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-10-23T00:00:00Z", "stage": 9.08, "flow": 801, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-03-28T00:00:00Z", "stage": 11.21, "flow": 3390, "preliminary": "O", "olddatum": false }, { "occurredTime": "2017-09-25T00:00:00Z", "stage": 7.88, "flow": 378, "preliminary": "O", "olddatum": false }, { "occurredTime": "2016-04-27T00:00:00Z", "stage": 4.82, "flow": 89, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-03-11T00:00:00Z", "stage": 7.85, "flow": 300, "preliminary": "O", "olddatum": false }, { "occurredTime": "2014-06-19T00:00:00Z", "stage": 9.82, "flow": 1950, "preliminary": "O", "olddatum": false }, { "occurredTime": "2013-04-28T00:00:00Z", "stage": 8.89, "flow": 1050, "preliminary": "O", "olddatum": false }, { "occurredTime": "2012-03-13T00:00:00Z", "stage": 6.39, "flow": 267, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-03-23T00:00:00Z", "stage": 10.3, "flow": 2380, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-03-15T00:00:00Z", "stage": 10.66, "flow": 2310, "preliminary": "O", "olddatum": false }, { "occurredTime": "2007-03-22T00:00:00Z", "stage": 9.82, "flow": 1950, "preliminary": "O", "olddatum": false }, { "occurredTime": "2006-03-31T00:00:00Z", "stage": 7.76, "flow": 554, "preliminary": "O", "olddatum": false }, { "occurredTime": "2005-06-14T00:00:00Z", "stage": 7.84, "flow": 565, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-06-02T00:00:00Z", "stage": 4.74, "flow": 75, "preliminary": "O", "olddatum": false }, { "occurredTime": "2003-03-17T00:00:00Z", "stage": 8.27, "flow": 250, "preliminary": "O", "olddatum": false }, { "occurredTime": "2002-03-29T00:00:00Z", "stage": 8.97, "flow": 800, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-04-07T00:00:00Z", "stage": 12.33, "flow": 8000, "preliminary": "R", "olddatum": false }, { "occurredTime": "2000-04-22T00:00:00Z", "stage": 4.25, "flow": 31, "preliminary": "O", "olddatum": false }, { "occurredTime": "1999-10-17T00:00:00Z", "stage": 8.6, "flow": 946, "preliminary": "O", "olddatum": false }, { "occurredTime": "1998-05-17T00:00:00Z", "stage": 8.87, "flow": 1140, "preliminary": "O", "olddatum": false }, { "occurredTime": "1997-04-05T00:00:00Z", "stage": 12.09, "flow": 7820, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-03-14T00:00:00Z", "stage": 10.67, "flow": 2500, "preliminary": "O", "olddatum": false }, { "occurredTime": "1995-03-12T00:00:00Z", "stage": 9.81, "flow": 2000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1994-03-20T00:00:00Z", "stage": 9.86, "flow": 2110, "preliminary": "O", "olddatum": false }, { "occurredTime": "1993-03-28T00:00:00Z", "stage": 11.07, "flow": 4000, "preliminary": "O", "olddatum": true }, { "occurredTime": "1992-07-02T00:00:00Z", "stage": 8.07, "flow": 736, "preliminary": "O", "olddatum": false }, { "occurredTime": "1991-06-21T00:00:00Z", "stage": 11.13, "flow": 3300, "preliminary": "O", "olddatum": true }, { "occurredTime": "1990-06-18T00:00:00Z", "stage": 4.56, "flow": 28, "preliminary": "O", "olddatum": false }, { "occurredTime": "1989-03-27T00:00:00Z", "stage": 8.98, "flow": 900, "preliminary": "O", "olddatum": false }, { "occurredTime": "1988-03-25T00:00:00Z", "stage": 6.26, "flow": 110, "preliminary": "O", "olddatum": false }, { "occurredTime": "1987-03-25T00:00:00Z", "stage": 8.01, "flow": 601, "preliminary": "O", "olddatum": false }, { "occurredTime": "1986-03-30T00:00:00Z", "stage": 11.08, "flow": 4970, "preliminary": "O", "olddatum": true }, { "occurredTime": "1985-03-17T00:00:00Z", "stage": 9.62, "flow": 1700, "preliminary": "O", "olddatum": false }, { "occurredTime": "1984-06-16T00:00:00Z", "stage": 9.25, "flow": 1330, "preliminary": "O", "olddatum": false }, { "occurredTime": "1983-04-02T00:00:00Z", "stage": 7.52, "flow": 396, "preliminary": "O", "olddatum": false }, { "occurredTime": "1982-03-30T00:00:00Z", "stage": 8.97, "flow": 250, "preliminary": "O", "olddatum": false }, { "occurredTime": "1981-06-15T00:00:00Z", "stage": 5.5, "flow": 88, "preliminary": "O", "olddatum": false }, { "occurredTime": "1980-03-19T00:00:00Z", "stage": 8.04, "flow": 330, "preliminary": "O", "olddatum": false }, { "occurredTime": "1979-04-13T00:00:00Z", "stage": 9.82, "flow": 1780, "preliminary": "O", "olddatum": false }, { "occurredTime": "1978-03-30T00:00:00Z", "stage": 11.07, "flow": 3720, "preliminary": "O", "olddatum": false }, { "occurredTime": "1977-06-16T00:00:00Z", "stage": 8.77, "flow": 938, "preliminary": "O", "olddatum": false }, { "occurredTime": "1976-03-24T00:00:00Z", "stage": 7.07, "flow": 288, "preliminary": "O", "olddatum": false }, { "occurredTime": "1975-04-17T00:00:00Z", "stage": 7.75, "flow": 301, "preliminary": "O", "olddatum": false }, { "occurredTime": "1974-04-04T00:00:00Z", "stage": 6.75, "flow": 232, "preliminary": "O", "olddatum": false }, { "occurredTime": "1973-03-15T00:00:00Z", "stage": 8.11, "flow": 595, "preliminary": "O", "olddatum": false } ] }, "lowWaters": { "historic": [] }, "impacts": [ { "stage": 20, "statement": "The bridge at the gaging location is overtopped" }, { "stage": 19, "statement": "The bridge 1 mile south of the gage is overtopped" }, { "stage": 16, "statement": "The water reaches the bottom of the bridge at the gage and the bridge 1 mile south of the gage" }, { "stage": 13, "statement": "Flooding begins to affect the city of watertown and the sidewalk on the highway 81 bridge is overtopped" }, { "stage": 12.5, "statement": "County roads begin to flood" }, { "stage": 11.5, "statement": "Significant amounts of pasture and crop land are flooded" }, { "stage": 9, "statement": "The lowest banks are overtopped and minimal areas of pasture land will be flooded" } ] }, "images": { "probability": { "weekint": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/WTRS2.SSTG.prob.weekint.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/WTRS2.QINE.prob.weekint.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/WTRS2.volume.prob.weekint.gif" }, "entperiod": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/WTRS2.SSTG.exceed.90day.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/WTRS2.QINE.exceed.90day.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/WTRS2.volume.exceed.90day.gif" }, "shortrange": "https://water.noaa.gov/resources/probabilistic/short_term/WTRS2.shortrange.hefs.png" }, "hydrograph": { "default": "https://water.noaa.gov/resources/hydrographs/wtrs2_hg.png", "floodcat": "https://water.noaa.gov/resources/hydrographs/wtrs2_record.png" }, "photos": [ { "id": "17706137865730855406", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 45.006111111111, -97.164722222222 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/wtrs2/17706137865730855406.jpeg", "caption": "Downstream View" } }, { "id": "17798750069440844270", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 45.006111111111, -97.164722222222 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/wtrs2/17798750069440844270.jpeg", "caption": "Upstream View" } } ] }, "dataAttribution": [ { "abbrev": "USGS", "text": "06479438", "title": "Observations courtesy of U.S. Geological Survey", "url": "https://waterdata.usgs.gov/nwis/inventory/?site_no=06479438" } ], "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": "0401", "expiration": "0930" }, { "statement": "River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.", "effective": "1001", "expiration": "0331" }, { "statement": "Gauge reading may be affected by ice.", "effective": "1101", "expiration": "0401" } ], "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": 1726.66 } ] }, "horizontal": { "value": [] }, "notes": { "value": [] } }, "inundation": { "enabled": false, "url": "", "zeroDatum": null, "downloads": null, "siteSpecificInfo": "", "dataAttribution": [] }, "upstreamLid": "FLOS2", "downstreamLid": "KAMS2", "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": "no_flooding", "ForecastFloodCategory": "fcst_not_current" }