{ "lid": "SSCN1", "usgsId": "06486000", "reachId": "17244390", "name": "Missouri River at Sioux City", "description": "", "rfc": { "abbreviation": "MBRFC", "name": "Missouri Basin River Forecast Center" }, "wfo": { "abbreviation": "FSD", "name": "Sioux Falls" }, "state": { "abbreviation": "NE", "name": "Nebraska" }, "county": "Dakota", "timeZone": "CST6CDT", "latitude": 42.485833333333, "longitude": -96.413611111111, "pedts": { "observed": "HGIRG", "forecast": "HGIFE" }, "status": { "observed": { "primary": 10.98, "primaryUnit": "ft", "secondary": 27.3, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-08-30T21:00:00Z" }, "forecast": { "primary": 10.8, "primaryUnit": "ft", "secondary": 26.7, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-08-31T00:00:00Z" } }, "flood": { "stageUnits": "ft", "flowUnits": "cfs", "categories": { "major": { "stage": 36, "flow": -9999 }, "moderate": { "stage": 33, "flow": -9999 }, "minor": { "stage": 30, "flow": -9999 }, "action": { "stage": 25, "flow": -9999 } }, "lro": { "minorCS": "< 0.05", "moderateCS": "< 0.05", "majorCS": "< 0.05", "producedTime": "2026-08-26T20:05:05Z", "interval": "SON" }, "crests": { "historic": [ { "occurredTime": "2011-07-21T00:00:00Z", "stage": 35.25, "flow": 192000, "preliminary": "R", "olddatum": false }, { "occurredTime": "2024-06-24T00:00:00Z", "stage": 32.23, "flow": 172000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1984-06-25T00:00:00Z", "stage": 30.77, "flow": 103000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1971-02-19T00:00:00Z", "stage": 30.65, "flow": 80000, "preliminary": "O", "olddatum": true }, { "occurredTime": "1960-04-03T00:00:00Z", "stage": 30.52, "flow": 101000, "preliminary": "O", "olddatum": true }, { "occurredTime": "2019-06-01T00:00:00Z", "stage": 30.27, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-03-17T00:00:00Z", "stage": 29.78, "flow": 159000, "preliminary": "O", 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"occurredTime": "1972-07-21T00:00:00Z", "stage": 25.06, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1971-02-19T00:00:00Z", "stage": 30.65, "flow": 80000, "preliminary": "O", "olddatum": true }, { "occurredTime": "1969-10-01T00:00:00Z", "stage": 25.47, "flow": 51200, "preliminary": "O", "olddatum": false }, { "occurredTime": "1969-04-10T00:00:00Z", "stage": 27.58, "flow": 77700, "preliminary": "O", "olddatum": true }, { "occurredTime": "1968-07-24T00:00:00Z", "stage": 25.27, "flow": 38300, "preliminary": "O", "olddatum": true }, { "occurredTime": "1967-07-25T00:00:00Z", "stage": 25.09, "flow": 0, "preliminary": "O", "olddatum": true }, { "occurredTime": "1966-07-27T00:00:00Z", "stage": 26, "flow": 38200, "preliminary": "O", "olddatum": true }, { "occurredTime": "1965-08-21T00:00:00Z", "stage": 25.67, "flow": 35600, "preliminary": "O", "olddatum": true }, { "occurredTime": "1964-08-06T00:00:00Z", "stage": 26.26, "flow": 37400, "preliminary": "O", "olddatum": true }, { "occurredTime": "1963-06-02T00:00:00Z", "stage": 26, "flow": 34400, "preliminary": "O", "olddatum": true }, { "occurredTime": "1962-03-28T00:00:00Z", "stage": 28.6, "flow": 0, "preliminary": "O", "olddatum": true }, { "occurredTime": "1961-08-10T00:00:00Z", "stage": 25.77, "flow": 32700, "preliminary": "O", "olddatum": true }, { "occurredTime": "1960-04-03T00:00:00Z", "stage": 30.52, "flow": 101000, "preliminary": "O", "olddatum": true }, { "occurredTime": "1959-05-31T00:00:00Z", "stage": 26.5, "flow": 33600, "preliminary": "O", "olddatum": true }, { "occurredTime": "1958-07-02T00:00:00Z", "stage": 27.28, "flow": 39500, "preliminary": "O", "olddatum": true }, { "occurredTime": "1957-06-25T00:00:00Z", "stage": 26.43, "flow": 0, "preliminary": "O", "olddatum": true }, { "occurredTime": "1956-08-18T00:00:00Z", "stage": 27.1, "flow": 38900, "preliminary": "O", "olddatum": true }, { "occurredTime": "1955-07-10T00:00:00Z", "stage": 26.19, "flow": 0, "preliminary": "O", "olddatum": true }, { "occurredTime": "1954-06-21T00:00:00Z", "stage": 26.83, "flow": 51300, "preliminary": "O", "olddatum": true }, { "occurredTime": "1953-06-25T00:00:00Z", "stage": 29.19, "flow": 109000, "preliminary": "O", "olddatum": true } ] }, "lowWaters": { "historic": [ { "occurredTime": "2024-01-14T00:00:00Z", "stage": 2.02, "flow": 7637, "statement": "Ice bite near Ponca" }, { "occurredTime": "2022-12-17T00:00:00Z", "stage": 2.44, "flow": 9730, "statement": "" }, { "occurredTime": "2025-01-21T00:00:00Z", "stage": 2.51, "flow": -9999, "statement": "" } ] }, "impacts": [ { "stage": 39, "statement": "Water reaches portions of 4th St in South Sioux City near the gauge location under the Hwy 20 bridge. " }, { "stage": 36, "statement": "Extensive urban flooding in lower lying portions of Sioux City begins." }, { "stage": 35, "statement": "The levee protecting various structures in parks and memorials on the Iowa side of the river is overtopped. " }, { "stage": 33, "statement": "Additional recreational areas and some pasture land along the river begin to flood." }, { "stage": 32, "statement": "Hamilton Blvd under I-29 is flooded." }, { "stage": 31, "statement": "The baseball fields at Scenic Park are flooded. " }, { "stage": 30, "statement": "Some of the boat docks and marinas along the river begin to flood. The levee at the Scenic Park campground is overtopped and flooding may impact the parking lot at the Lewis and Clark Interpretive Center if the levee is breached. " }, { "stage": 29, "statement": "The parking lots of baseball fields at Scenic Park begin to flood on the Nebraska side of the river. The lowest portions near the Lewis and Clark Interpretive Center and Flight 232 Memorial begin to flood. " }, { "stage": 25, "statement": "Lower Scenic Park campground in South Sioux City may begin to be affected by flooding." }, { "stage": 4, "statement": "The power and industrial plants around Sioux City may begin to encounter challenges as the water levels fall below what is needed for the cooling intake valves." } ] }, "images": { "probability": { "weekint": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/SSCN1.SSTG.prob.weekint.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/SSCN1.QINE.prob.weekint.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/SSCN1.volume.prob.weekint.gif" }, "entperiod": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/SSCN1.SSTG.exceed.90day.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/SSCN1.QINE.exceed.90day.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/SSCN1.volume.exceed.90day.gif" }, "shortrange": "https://water.noaa.gov/resources/probabilistic/short_term/SSCN1.shortrange.hefs.png" }, "hydrograph": { "default": "https://water.noaa.gov/resources/hydrographs/sscn1_hg.png", "floodcat": "https://water.noaa.gov/resources/hydrographs/sscn1_record.png" }, "photos": [ { "id": "6724719471332626926", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 42.485833333333, -96.413611111111 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/sscn1/6724719471332626926.jpeg", "caption": "Upstream View (IA Side 9/25/2023)" } }, { "id": "13570797225468957166", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 42.485833333333, -96.413611111111 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/sscn1/13570797225468957166.jpeg", "caption": "Downstream View (IA Side 9/25/2023)" } } ] }, "dataAttribution": [ { "abbrev": "U.S. Geological Survey", "text": "06486000", "title": "Observations courtesy of U.S. Geological Survey", "url": "https://waterdata.usgs.gov/nwis/inventory/?site_no=06486000" }, { "abbrev": "U.S. Army Corps of Engineers", "text": "Website", "title": "Observations courtesy of U.S. Army Corps of Engineers", "url": "https://www.nwd.usace.army.mil/MRWM/Current-Conditions/" } ], "impactsLowWaters": [], "normalThreshold": { "value": 0, "units": "ft" }, "hydronotes": [ { "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": "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": "Gauge reading affected by reservoir operations.", "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": 1057.42 } ] }, "horizontal": { "value": [] }, "notes": { "value": [] } }, "inundation": { "enabled": false, "url": "", "zeroDatum": null, "downloads": null, "siteSpecificInfo": "", "dataAttribution": [] }, "upstreamLid": "MRPN1", "downstreamLid": "DCTN1", "inService": { "enabled": true, "message": "" }, "lowThreshold": { "units": "ft", "value": 4 }, "forecastReliability": "Forecasts are issued routinely year-round.", "TruncateObs": "-1", "TruncateFcst": "-1", "ObservedFloodCategory": "no_flooding", "ForecastFloodCategory": "no_flooding" }