{ "lid": "QLDI2", "usgsId": "", "reachId": "5803958", "name": "Mississippi River at Quincy Lock and Dam 21", "description": "", "rfc": { "abbreviation": "NCRFC", "name": "North Central River Forecast Center" }, "wfo": { "abbreviation": "LSX", "name": "St. Charles" }, "state": { "abbreviation": "IL", "name": "Illinois" }, "county": "Adams", "timeZone": "CST6CDT", "latitude": 39.902245, "longitude": -91.430302, "pedts": { "observed": "HTIRG", "forecast": "HTIFF" }, "status": { "observed": { "primary": 2.6, "primaryUnit": "ft", "secondary": 28, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-08-30T21:00:00Z" }, "forecast": { "primary": 2.8, "primaryUnit": "ft", "secondary": 30.5, "secondaryUnit": "kcfs", "floodCategory": "no_flooding", "validTime": "2026-09-01T00:00:00Z" } }, "flood": { "stageUnits": "ft", "flowUnits": "cfs", "categories": { "major": { "stage": 25, "flow": -9999 }, "moderate": { "stage": 21, "flow": -9999 }, "minor": { "stage": 18, "flow": -9999 }, "action": { "stage": 16, "flow": -9999 } }, "lro": { "minorCS": "0.1", "moderateCS": "< 0.05", "majorCS": "< 0.05", "producedTime": "2026-08-28T20:02:41Z", "interval": "SON" }, "crests": { "historic": [ { "occurredTime": "1993-07-13T00:00:00Z", "stage": 31.3, "flow": 428694, "preliminary": "R", "olddatum": false }, { "occurredTime": "2019-06-01T17:00:00Z", "stage": 30.15, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-06-18T10:40:00Z", "stage": 29.58, "flow": 476900, "preliminary": "O", "olddatum": false }, { "occurredTime": "1973-04-25T00:00:00Z", "stage": 27.7, "flow": 378687, "preliminary": "O", "olddatum": false }, { "occurredTime": "2013-04-21T09:00:00Z", "stage": 27.24, "flow": 406900, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-05-16T07:00:00Z", "stage": 26.55, "flow": 363374, "preliminary": "O", "olddatum": false }, { "occurredTime": "2014-07-08T07:00:00Z", "stage": 26.15, "flow": 382150, "preliminary": "O", "olddatum": false }, { "occurredTime": "1986-10-04T00:00:00Z", "stage": 24.86, "flow": 339995, "preliminary": "O", "olddatum": false }, { "occurredTime": "2013-06-01T11:00:00Z", "stage": 24.74, "flow": 351900, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-05-29T00:00:00Z", "stage": 24.05, "flow": 328122, "preliminary": "O", "olddatum": false }, { "occurredTime": "2018-10-12T06:10:00Z", "stage": 23.96, "flow": 336200, "preliminary": "O", "olddatum": false }, { "occurredTime": "1965-04-28T00:00:00Z", "stage": 23.89, "flow": 325723, "preliminary": "O", "olddatum": false }, { "occurredTime": "1983-04-05T00:00:00Z", "stage": 23.51, "flow": 319040, "preliminary": "O", "olddatum": false }, { "occurredTime": "1960-04-04T00:00:00Z", "stage": 23.45, "flow": 319040, "preliminary": "O", "olddatum": false }, { "occurredTime": "1947-06-10T00:00:00Z", "stage": 23.32, "flow": 317042, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-06-16T17:00:00Z", "stage": 22.8, "flow": 263000, "preliminary": "O", "olddatum": false }, { "occurredTime": "1998-04-15T00:00:00Z", "stage": 22.73, "flow": 307849, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-04-28T12:08:00Z", "stage": 22.6, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-05-05T02:00:00Z", "stage": 22.45, "flow": 259000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-04-24T05:40:00Z", "stage": 22.21, "flow": 254000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-06-24T10:30:00Z", "stage": 21.6, "flow": 244000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-03-12T09:50:00Z", "stage": 21.16, "flow": 288019, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-12-29T12:10:00Z", "stage": 21.08, "flow": 286700, "preliminary": "O", "olddatum": false }, { "occurredTime": "2002-05-13T15:30:00Z", "stage": 20.89, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-07-21T20:40:00Z", "stage": 20.86, "flow": 232000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-04-27T15:00:00Z", "stage": 20.52, "flow": 226000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2023-05-05T06:20:00Z", "stage": 20.37, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-05-17T10:30:00Z", "stage": 20.13, "flow": 273400, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-06-04T00:00:00Z", "stage": 20, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-06-07T05:00:00Z", "stage": 19.7, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2018-09-09T03:00:00Z", "stage": 19.62, "flow": 265100, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-06-28T21:00:00Z", "stage": 19.58, "flow": 212000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2011-06-04T05:00:00Z", "stage": 19.46, "flow": 211000, "preliminary": "O", "olddatum": false }, { "occurredTime": 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"preliminary": "O", "olddatum": false }, { "occurredTime": "2017-04-07T15:10:00Z", "stage": 17.23, "flow": 221800, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-09-15T11:20:00Z", "stage": 17.21, "flow": 169000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-10-09T21:00:00Z", "stage": 17.02, "flow": 165000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2003-05-28T00:00:00Z", "stage": 15.61, "flow": 0, "preliminary": "O", "olddatum": false } ], "recent": [ { "occurredTime": "2026-04-28T11:00:00Z", "stage": 18.56, "flow": 245900, "preliminary": "O", "olddatum": false }, { "occurredTime": "2023-05-05T06:20:00Z", "stage": 20.37, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2020-04-02T04:10:00Z", "stage": 18.86, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-10-17T09:00:00Z", "stage": 19.16, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2019-10-02T17:00:00Z", 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"olddatum": false }, { "occurredTime": "2011-04-11T23:00:00Z", "stage": 17.26, "flow": 171000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-10-09T21:00:00Z", "stage": 17.02, "flow": 165000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-08-15T23:20:00Z", "stage": 18.51, "flow": 192000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-07-21T20:40:00Z", "stage": 20.86, "flow": 232000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-06-24T10:30:00Z", "stage": 21.6, "flow": 244000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-06-15T16:20:00Z", "stage": 17.72, "flow": 178000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-05-15T06:50:00Z", "stage": 19.05, "flow": 203000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-04-27T02:20:00Z", "stage": 17.42, "flow": 172000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-03-15T20:00:00Z", "stage": 19.07, "flow": 203000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-11-01T01:30:00Z", "stage": 18.68, "flow": 196000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-05-17T10:30:00Z", "stage": 20.13, "flow": 273400, "preliminary": "O", "olddatum": false }, { "occurredTime": "2009-03-12T09:50:00Z", "stage": 21.16, "flow": 288019, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-09-15T11:20:00Z", "stage": 17.21, "flow": 169000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-06-18T10:40:00Z", "stage": 29.58, "flow": 476900, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-05-05T02:00:00Z", "stage": 22.45, "flow": 259000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-04-27T15:00:00Z", "stage": 20.52, "flow": 226000, "preliminary": "O", "olddatum": false }, { "occurredTime": "2007-08-27T00:00:00Z", "stage": 17.5, "flow": 220590, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-06-04T00:00:00Z", "stage": 20, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2003-05-28T00:00:00Z", "stage": 15.61, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2002-05-13T15:30:00Z", "stage": 20.89, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-06-07T05:00:00Z", "stage": 19.7, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-06-02T12:00:00Z", "stage": 18, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-05-16T07:00:00Z", "stage": 26.55, "flow": 363374, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-04-28T12:08:00Z", "stage": 22.6, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1998-04-15T00:00:00Z", "stage": 22.73, "flow": 307849, "preliminary": "O", "olddatum": false }, { "occurredTime": "1996-05-29T00:00:00Z", "stage": 24.05, "flow": 328122, "preliminary": "O", "olddatum": false }, { "occurredTime": "1993-07-13T00:00:00Z", "stage": 31.3, "flow": 428694, "preliminary": "R", "olddatum": false }, { "occurredTime": "1986-10-04T00:00:00Z", "stage": 24.86, "flow": 339995, "preliminary": "O", "olddatum": false }, { "occurredTime": "1983-04-05T00:00:00Z", "stage": 23.51, "flow": 319040, "preliminary": "O", "olddatum": false }, { "occurredTime": "1973-04-25T00:00:00Z", "stage": 27.7, "flow": 378687, "preliminary": "O", "olddatum": false }, { "occurredTime": "1965-04-28T00:00:00Z", "stage": 23.89, "flow": 325723, "preliminary": "O", "olddatum": false }, { "occurredTime": "1960-04-04T00:00:00Z", "stage": 23.45, "flow": 319040, "preliminary": "O", "olddatum": false }, { "occurredTime": "1947-06-10T00:00:00Z", "stage": 23.32, "flow": 317042, "preliminary": "O", "olddatum": false } ] }, "lowWaters": { "historic": [] }, "impacts": [ { "stage": 140000, "statement": "At this approximate discharge, the Corps will raise the gates out of the water, creating \"open river\" conditions." }, { "stage": 26.9, "statement": "Missouri Highway 168 east of Palmyra near the BASF plant closes near this height." }, { "stage": 25.7, "statement": "At this height, the lock wall is inundated." }, { "stage": 25, "statement": "Quincy Waterworks inundated." }, { "stage": 21.9, "statement": "Near this level, the lock is closed to navigation. This level will vary with circumstance." }, { "stage": 14, "statement": "Unprotected bottomlands flood." }, { "stage": 12.3, "statement": "This is the upper limit of the target pool level at Lock and Dam 21." }, { "stage": 12.2, "statement": "This is the target pool level for navigation at Lock & Dam 21." }, { "stage": 12, "statement": "At some point between 11.6 to 12.1 feet, the Corps will lift all gates out of the river creating \"open river\" conditions, corresponding to an approximate discharge of 140,000 cfs." }, { "stage": 11.8, "statement": "This is the lower limit of the target pool level at Lock & Dam 21." } ] }, "images": { "probability": { "weekint": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/QLDI2.SSTG.prob.weekint.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/QLDI2.QINE.prob.weekint.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/QLDI2.volume.prob.weekint.gif" }, "entperiod": { "stage": "https://water.noaa.gov/resources/probabilistic/exceedance/QLDI2.SSTG.exceed.90day.gif", "flow": "https://water.noaa.gov/resources/probabilistic/exceedance/QLDI2.QINE.exceed.90day.gif", "volume": "https://water.noaa.gov/resources/probabilistic/exceedance/QLDI2.volume.exceed.90day.gif" }, "shortrange": "https://water.noaa.gov/resources/probabilistic/short_term/QLDI2.shortrange.hefs.png" }, "hydrograph": { "default": "https://water.noaa.gov/resources/hydrographs/qldi2_hg.png", "floodcat": "https://water.noaa.gov/resources/hydrographs/qldi2_record.png" }, "photos": [ { "id": "4999518442394423790", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.902245, -91.430302 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/qldi2/4999518442394423790.jpeg", "caption": "Downstream View" } }, { "id": "4985777111142699502", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.902245, -91.430302 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/qldi2/4985777111142699502.jpeg", "caption": "Aerial View" } }, { "id": "4993168148563694062", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.902245, -91.430302 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/qldi2/4993168148563694062.jpeg", "caption": "Upstream View looking north toward Quincy" } }, { "id": "5005741416214630894", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.902245, -91.430302 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/qldi2/5005741416214630894.jpeg", "caption": "Pool View looking west toward Missouri" } }, { "id": "5012574494434202094", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.902245, -91.430302 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/qldi2/5012574494434202094.jpeg", "caption": "Tailwater Overview looking northwest" } }, { "id": "5018966303418814958", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.902245, -91.430302 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/qldi2/5018966303418814958.jpeg", "caption": "Tailwater View looking west toward Missouri" } }, { "id": "7713635296099832302", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.902245, -91.430302 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/qldi2/7713635296099832302.jpeg", "caption": "Quincy Lock and Dam 21 pool on 19 June 2008 (HT=26.59 ft., HP=27.48 ft.)" } }, { "id": "7722514513919087086", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.902245, -91.430302 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/qldi2/7722514513919087086.jpeg", "caption": "Quincy Lock debris in pool on 19 June 2008 (HP=27.48, HT=26.59)" } }, { "id": "7730504153817027054", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.902245, -91.430302 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/qldi2/7730504153817027054.jpeg", "caption": "Quincy Lock and Dam pool gages on 19 June 2008 (HP=27.48, HT=26.59)" } }, { "id": "7738845865069122030", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.902245, -91.430302 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/qldi2/7738845865069122030.jpeg", "caption": "Quincy Lock and Dam 21 lock house on 19 June 2008 at a tailwater of 26.59 ft." } }, { "id": "7747908349142897134", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.902245, -91.430302 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/qldi2/7747908349142897134.jpeg", "caption": "Quincy Lock and Dam 21 pool on 19 June 2008 with a pool reading of 27.48 ft." } }, { "id": "12358153002315551214", "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 39.902245, -91.430302 ] }, "properties": { "image": "https://water.noaa.gov/resources/photos/qldi2/12358153002315551214.jpeg", "caption": "Cropland flooding west of Illinois Highway 57 on June 25, 2010 at a stage of 21.06 ft." } } ] }, "dataAttribution": [ { "abbrev": "US Army of Corps of Engineers", "text": "Rivergages.com", "title": "US Army of Corps of Engineers", "url": "https://rivergages.com" } ], "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" }, { "statement": "For the latest navigation status update from the U.S. Army Corps of Engineers-St. Louis District, click here.", "effective": "0101", "expiration": "1231" } ], "datums": { "vertical": { "value": [] }, "horizontal": { "value": [] }, "notes": { "value": [] } }, "inundation": { "enabled": false, "url": "", "zeroDatum": null, "downloads": null, "siteSpecificInfo": "", "dataAttribution": [] }, "upstreamLid": "UINI2", "downstreamLid": "HNNM7", "inService": { "enabled": true, "message": "" }, "lowThreshold": null, "forecastReliability": "Forecasts are issued routinely year-round.", "TruncateObs": "-1", "TruncateFcst": "-1", "ObservedFloodCategory": "no_flooding", "ForecastFloodCategory": "no_flooding" }