{ "lid": "NLGI2", "usgsId": "05585100", "reachId": "3598402", "name": "Illinois River at LaGrange Lock and Dam", "description": "", "rfc": { "abbreviation": "NCRFC", "name": "North Central River Forecast Center" }, "wfo": { "abbreviation": "LSX", "name": "St. Charles" }, "state": { "abbreviation": "IL", "name": "Illinois" }, "county": "Brown", "timeZone": "CST6CDT", "latitude": 39.93952, "longitude": -90.535273, "pedts": { "observed": "HTIRG", "forecast": "HTIFF" }, "status": { "observed": { "primary": 17.75, "primaryUnit": "ft", "secondary": 38.5, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-08-30T22:00:00Z" }, "forecast": { "primary": 17.6, "primaryUnit": "ft", "secondary": 38.1, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-08-31T00:00:00Z" } }, "flood": { "stageUnits": "ft", "flowUnits": "cfs", "categories": { "major": { "stage": 29, "flow": -9999 }, "moderate": { "stage": 27, "flow": -9999 }, "minor": { "stage": 23, "flow": -9999 }, "action": { "stage": 21, "flow": -9999 } }, "lro": null, "crests": { "historic": [ { "occurredTime": "2015-07-02T05:00:00Z", "stage": 34.66, "flow": 126400, "preliminary": "R", "olddatum": false }, { "occurredTime": "2013-04-27T17:00:00Z", "stage": 34.5, "flow": -9999, "preliminary": "O", "olddatum": false }, { "occurredTime": "1995-06-01T00:00:00Z", "stage": 34.02, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-06-04T02:00:00Z", "stage": 33.89, "flow": 118200, "preliminary": "O", "olddatum": false }, { "occurredTime": "2002-05-20T00:00:00Z", "stage": 33.34, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1979-04-19T00:00:00Z", "stage": 32.8, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1973-04-29T07:00:00Z", "stage": 32, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-05-22T17:00:00Z", "stage": 32, "flow": 127300, "preliminary": "O", "olddatum": false }, { "occurredTime": "1993-07-29T07:00:00Z", "stage": 32, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2020-05-27T13:00:00Z", "stage": 31.35, "flow": 103380, "preliminary": "O", "olddatum": false }, { "occurredTime": "2013-06-06T05:00:00Z", "stage": 31.15, "flow": -9999, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-06-29T17:00:00Z", "stage": 30.42, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1993-04-23T07:00:00Z", "stage": 30, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2017-05-08T17:00:00Z", "stage": 29.75, "flow": 87500, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-03-19T01:00:00Z", "stage": 29.72, "flow": 101651, "preliminary": "O", "olddatum": false }, { "occurredTime": "2005-01-20T17:30:00Z", "stage": 29.44, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-09-24T03:00:00Z", "stage": 29.35, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-06-28T13:30:00Z", "stage": 27.86, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-11-06T22:00:00Z", "stage": 27.65, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-05-04T03:00:00Z", "stage": 27.47, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-01-06T16:00:00Z", "stage": 26.58, "flow": 82900, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-03-03T08:00:00Z", "stage": 26.4, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-06-02T12:00:00Z", "stage": 26.1, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2018-03-07T10:30:00Z", "stage": 26.04, "flow": 81850, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-02-23T18:00:00Z", "stage": 25.72, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-01-02T12:00:00Z", "stage": 25.57, "flow": 70500, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-05-23T07:30:00Z", "stage": 25.39, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2007-04-04T19:00:00Z", "stage": 25.3, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-06-16T17:00:00Z", "stage": 25.22, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-04-01T05:00:00Z", "stage": 24.88, "flow": 72064, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-03-22T05:00:00Z", "stage": 24.83, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2017-04-14T01:30:00Z", "stage": 24.78, "flow": 57030, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-07-07T11:00:00Z", "stage": 24.27, "flow": 70600, "preliminary": "O", "olddatum": false }, { "occurredTime": "2024-02-05T10:00:00Z", "stage": 24.06, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-02-17T14:30:00Z", "stage": 23.93, "flow": 68700, "preliminary": "O", "olddatum": false }, { "occurredTime": "2007-03-08T14:00:00Z", "stage": 23.75, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2020-01-24T07:30:00Z", "stage": 23.62, "flow": 60032, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-01-19T22:00:00Z", "stage": 23.6, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-01-30T18:00:00Z", "stage": 23.34, "flow": 59000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-02-28T00:00:00Z", "stage": 23.16, "flow": 63570, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-12-13T06:00:00Z", "stage": 23.03, "flow": 55355, "preliminary": "O", "olddatum": false } ], "recent": [ { "occurredTime": "2024-02-05T10:00:00Z", "stage": 24.06, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2021-07-07T11:00:00Z", "stage": 24.27, "flow": 70600, "preliminary": "O", "olddatum": false }, { "occurredTime": "2020-05-27T13:00:00Z", "stage": 31.35, "flow": 103380, "preliminary": "O", "olddatum": false }, { "occurredTime": "2020-01-24T07:30:00Z", "stage": 23.62, "flow": 60032, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-06-04T02:00:00Z", "stage": 33.89, "flow": 118200, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-04-01T05:00:00Z", "stage": 24.88, "flow": 72064, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-02-28T00:00:00Z", "stage": 23.16, "flow": 63570, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-02-17T14:30:00Z", "stage": 23.93, "flow": 68700, "preliminary": "O", "olddatum": false }, { "occurredTime": "2018-03-07T10:30:00Z", "stage": 26.04, "flow": 81850, "preliminary": "O", "olddatum": false }, { "occurredTime": "2017-05-08T17:00:00Z", "stage": 29.75, "flow": 87500, "preliminary": "O", "olddatum": false }, { "occurredTime": "2017-04-14T01:30:00Z", "stage": 24.78, "flow": 57030, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-07-02T05:00:00Z", "stage": 34.66, "flow": 126400, "preliminary": "R", "olddatum": false }, { "occurredTime": "2013-06-06T05:00:00Z", "stage": 31.15, "flow": -9999, "preliminary": "O", "olddatum": false }, { "occurredTime": "2013-04-27T17:00:00Z", "stage": 34.5, "flow": -9999, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-06-28T13:30:00Z", "stage": 27.86, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-05-04T03:00:00Z", "stage": 27.47, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-06-29T17:00:00Z", "stage": 30.42, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-05-23T07:30:00Z", "stage": 25.39, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-03-22T05:00:00Z", "stage": 24.83, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-01-30T18:00:00Z", "stage": 23.34, "flow": 59000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-01-02T12:00:00Z", "stage": 25.57, "flow": 70500, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-11-06T22:00:00Z", "stage": 27.65, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-05-22T17:00:00Z", "stage": 32, "flow": 127300, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-03-19T01:00:00Z", "stage": 29.72, "flow": 101651, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-01-06T16:00:00Z", "stage": 26.58, "flow": 82900, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-09-24T03:00:00Z", "stage": 29.35, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-06-16T17:00:00Z", "stage": 25.22, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-02-23T18:00:00Z", "stage": 25.72, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-01-19T22:00:00Z", "stage": 23.6, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2007-04-04T19:00:00Z", "stage": 25.3, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2007-03-08T14:00:00Z", "stage": 23.75, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2005-01-20T17:30:00Z", "stage": 29.44, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-12-13T06:00:00Z", "stage": 23.03, "flow": 55355, "preliminary": "O", "olddatum": false }, { "occurredTime": "2002-05-20T00:00:00Z", "stage": 33.34, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-06-02T12:00:00Z", "stage": 26.1, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-03-03T08:00:00Z", "stage": 26.4, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1995-06-01T00:00:00Z", "stage": 34.02, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1993-07-29T07:00:00Z", "stage": 32, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1993-04-23T07:00:00Z", "stage": 30, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1979-04-19T00:00:00Z", "stage": 32.8, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1973-04-29T07:00:00Z", "stage": 32, "flow": 0, "preliminary": "O", "olddatum": false } ] }, "lowWaters": { "historic": [] }, "impacts": [ { "stage": 36, "statement": "Lockmasters house and the lower Corps building at the lock and dam begin flooding." }, { "stage": 35.5, "statement": "LaGrange Road (County Highway 12) is flooded south of LaGrange Lock and Dam." }, { "stage": 29.5, "statement": "La Grange Lock Road (County Road 1730N) is flooded just north of the Lock and Dam." }, { "stage": 28.8, "statement": "County Road 500N south of La Grange is closed due to flooding." }, { "stage": 24, "statement": "Extensive wetland acreage south of La Grange begins flooding." }, { "stage": 23, "statement": "Adjacent farmland and wetlands begins flooding. Island Road across the river in western Cass County begins flooding." }, { "stage": 20.5, "statement": "The lock wall is completely overtopped." }, { "stage": 16.5, "statement": "The earthen part of the dam is overtopped." }, { "stage": 15.5, "statement": "Normal pool level (429.0 NGVD29)." }, { "stage": 14, "statement": "Dam goes up at this pool level (427.5 NGVD29)." }, { "stage": 5.6, "statement": "At and below this height, barge traffic will need to consider lowering tonnage to avoid grounding." } ] }, "images": { "probability": { "weekint": { "stage": "", "flow": "", "volume": "" }, "entperiod": { "stage": "", "flow": "", "volume": "" }, "shortrange": "https://water.noaa.gov/resources/probabilistic/short_term/NLGI2.shortrange.hefs.png" }, "hydrograph": { "default": "https://water.noaa.gov/resources/hydrographs/nlgi2_hg.png", "floodcat": "https://water.noaa.gov/resources/hydrographs/nlgi2_record.png" }, "photos": [ { "id": "1383397223180603886", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.93952, -90.535273 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/nlgi2/1383397223180603886.jpeg", "caption": "Looking downstream from New La Grange Lock and Dam" } }, { "id": "14919406283419423214", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.93952, -90.535273 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/nlgi2/14919406283419423214.jpeg", "caption": "Staff gage at the tailwater of New La Grange Lock and Dam" } }, { "id": "14925334025482670574", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.93952, -90.535273 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/nlgi2/14925334025482670574.jpeg", "caption": "Looking upstream from New La Grange Lock and Dam" } }, { "id": "14934754520850371054", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.93952, -90.535273 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/nlgi2/14934754520850371054.jpeg", "caption": "Illinois Conservancy wetlands south of La Grange on September 26, 2008 at a stage of 29.1 ft." } }, { "id": "14951759606340260334", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.93952, -90.535273 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/nlgi2/14951759606340260334.jpeg", "caption": "Illinois Conservancy wetlands south of La Grange on September 26, 2008 at a stage of 29.1 ft." } }, { "id": "14970379204396454382", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.93952, -90.535273 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/nlgi2/14970379204396454382.jpeg", "caption": "Lock and Dam Road at La Grange Lock and Dam on September 26, 2008 at a stage of 29.0 ft." } }, { "id": "14989465884441055726", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.93952, -90.535273 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/nlgi2/14989465884441055726.jpeg", "caption": "Brown County Road 500N on September 26, 2008 at a stage of 29.1 ft." } }, { "id": "15007884478027796974", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.93952, -90.535273 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/nlgi2/15007884478027796974.jpeg", "caption": "Brown County Road 1965E on May 19, 2009 at a stage of 30.3 ft." } }, { "id": "15026667151697252846", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.93952, -90.535273 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/nlgi2/15026667151697252846.jpeg", "caption": "Lockmaster's residence in the backyard on May 23, 2009 at a stage of 31.9 ft." } }, { "id": "15044280898477494766", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.93952, -90.535273 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/nlgi2/15044280898477494766.jpeg", "caption": "Utility building at La Grange Lock and Dam on May 23, 2009 at a stage of 31.9 ft." } } ] }, "dataAttribution": [ { "abbrev": "USGS", "text": "05585100", "title": "Observations courtesy of U.S. Geological Survey", "url": "https://waterdata.usgs.gov/nwis/inventory/?site_no=05585100" } ], "impactsLowWaters": [], "normalThreshold": null, "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" } ], "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": 413.5 } ] }, "horizontal": { "value": [] }, "notes": { "value": [] } }, "inundation": { "enabled": false, "url": "", "zeroDatum": null, "downloads": null, "siteSpecificInfo": "", "dataAttribution": [] }, "upstreamLid": "BEAI2", "downstreamLid": "MROI2", "inService": { "enabled": true, "message": "" }, "lowThreshold": null, "forecastReliability": "Forecasts are issued routinely year-round.", "TruncateObs": "-1", "TruncateFcst": "7", "ObservedFloodCategory": "no_flooding", "ForecastFloodCategory": "no_flooding" }