{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -90.907, 39.375 ] }, "properties":{ "provider":"MVS", "code":"LD 24", "slug":"ld%2024", "elevation":421.81, "horizontal_datum":"WGS84", "vertical_datum":"NGVD29", "state":"MO", "kind":"PROJECT", "nearest_city":"Clarksville", "public_name":"LD 24 Project", "location_code":4709018, "nsid":null, "aliases":{ "NIDID":"MO10300" }, "timeseries":[ { "tsid":"LD 24 Pool-Mississippi.Elev.Inst.30Minutes.0.lrgsShef-rev", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-08-25T22:00:00Z", "latest_value":448.88, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"LD 24 TW-Mississippi.Elev.Inst.30Minutes.0.lrgsShef-rev", "label":"Elevation Tailwater", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-08-25T22:00:00Z", "latest_value":435.16, "delta24h":null, "sort_order":3, "results":null }, { "tsid":"LD 24 TW-Mississippi.Flow.Inst.30Minutes.0.RatingCOE", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-08-25T22:00:00Z", "latest_value":44360.01, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"LD 24 TW-Mississippi.Stage.Inst.30Minutes.0.lrgsShef-rev", "label":"Stage Tailwater", "base_parameter":"Stage", "parameter":"Stage", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-08-25T22:00:00Z", "latest_value":13.57, "delta24h":null, "sort_order":5, "results":null }, { "tsid":"LD 24 Pool-Mississippi.Stage.Inst.30Minutes.0.lrgsShef-rev", "label":"Stage", "base_parameter":"Stage", "parameter":"Stage", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-08-25T22:00:00Z", "latest_value":27.29, "delta24h":null, "sort_order":4, "results":null } ], "name":"LD 24 Project", "hasResopsAverages":"false", "nidId":"MO10300", "nidid":"", "levels":[ { "slug":"stage.flood", "label":"Flood", "parameter":"Stage", "base_parameter":"Stage", "tsid":"LD 24.Stage.Inst.0.Flood", "latest_value":909, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" } ], "id":550294, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":55, "damLength":4584, "distance":1, "drainageArea":140900, "eapId":1, "dsacAssignedDate":"2017-05-25T12:00:00.000Z", "eapMeetsGuidelinesId":0, "emergencyContactsUpdated":"2024-10-16T12:00:00.000Z", "eapLastRevDate":"2015-07-06T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"MO10300", "oldFederalId":"MO10300", "hazardId":3, "hydraulicHeight":32, "inspectionAuthorityId":0, "inspectionDate":"2022-03-15T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":39.3790470000001, "lengthOfLocks":600, "secondaryLengthOfLocks":null, "longitude":-90.901085, "maxDischarge":364000, "maxStorage":125363, "nidHeight":76, "nidStorage":125363, "normalStorage":125363, "numberOfLocks":1, "operationalStatusDate":"2017-05-25T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) operates and maintains more than 700 dams across the United States. Locks and Dam 24 is located on the Mississippi River adjacent to Clarksville, Missouri, 93.5 river miles upstream from St. Louis and 273.5 miles upstream from the mouth of the Ohio River. The dam and 600-foot main lock were authorized by the Rivers and Harbors Act, 3 July 1930, Rivers and Harbors Commission Document No. 12, 70th Congress, First Session. Lock and Dam 24 was authorized as part of the navigation project to provide a 9-foot deep by 300-foot minimum width channel on the upper Mississippi River between the mouth of the Missouri River and Minneapolis, Minnesota. The project was placed in operation on 12 March 1940. The project consists of a dam structure with 15 Tainter gates, 600-foot lock, partial auxiliary lock to be completed in the future, and an overflow dike that ties into the Sny Island Levee and Drainage District.", "riskCharSummary":"Mississippi River Lock and Dam 24 is currently categorized as a Dam Safety Action Classification (DSAC) 4, which is considered low urgency in that there is low incremental risk. Inundation maps and consequence estimates were not produced for this dam since there is no potential loss of life should it fail or mis-operate. This dam is designed with limited storage during normal and low water operations to ensure adequate flows to support navigation. During high flow events, the dam functions as a run-of-the-river project, allowing the river to pass through naturally. Therefore, in the unlikely event of a dam failure with low or normal water flows in the river, water would not overflow the riverbanks. If the dam failed during a large flood, the dam itself would not affect the extent of flooding since it was not storing water. \nFor this navigation project, failure is defined as the inability to maintain navigation services or preserve the 9-foot channel. Three risk driving failure modes were determined from the previous risk assessment. Two of the failure modes were related to fatigue from years of service and the third was due to conditions beyond the project\u2019s control . Since the risk assessment, one of the fatigue failure modes has been permanently repaired and operations have been adjusted to prevent further degradation of the other.", "riskManagementMeasures":"USACE is continuously taking significant steps to reduce the risk of malfunction and loss of services through risk-based decision making, enterprise lessons learned, and routine inspections. USACE regularly inspects and monitors instruments to verify the health of the structure, including conducting underwater surveys upstream, downstream, and around the project to monitor for changing conditions. The frequency of data collection and inspection increases when the hazards change, which includes hydraulic loading, seismicity, events caused by human error, and is prioritized in accordance with the risk assessment. This ensures that the structure operates as intended, enabling the detection of any potential issues, which allows USACE to address them proactively before they impact services. Regular maintenance and repairs are performed as needed to keep the project functioning properly. Although all risk cannot be eliminated, USACE works closely with local emergency managers to regularly update the Emergency Action Plan and conduct emergency exercises with state and local response teams to ensure preparedness in the event of an emergency.", "riverName":"MISSISSIPPI RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":1200, "stateFedId":"MO10300", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":76, "submitDate":"2023-06-27T15:16:06.968Z", "surfaceArea":13000, "volume":0, "widthOfLocks":110, "secondaryWidthOfLocks":null, "yearCompleted":1940, "congDist":"Congressional District 15, Illinois", "city":"CLARKSVILLE", "county":"Calhoun", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":"4", "damTypeIds":"11;12;9", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"1;3", "nonFederalDamOnFederalId":0, "designerNames":"CEMVS", "otherNames":"Mississippi River", "ownerNames":"USACE - St. Louis District", "ownerTypeIds":"3", "primaryDamTypeId":11, "primaryOwnerTypeId":3, "primaryPurposeId":3, "purposeIds":"3", "dsacId":4, "femaRegion":"7", "lastEapExcerDate":"2024-09-26T12:00:00.000Z", "dataUpdated":"2025-02-04T12:00:00.000Z", "usaceDistrict":"St. Louis District", "noConsequencesId":1, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":2, "damStatusId":2, "huc06":"071100", "doi_region":null, "doi_region_name":"Great Lakes", "doi_region_number":3 }, "id":4709018, "links":[ { "type":"application/json", "rel":"root", "title":"The landing page of this server as JSON", "href":"https://api.wwdh.internetofwater.app?f=json" }, { "type":"text/html", "rel":"root", "title":"The landing page of this server as HTML", "href":"https://api.wwdh.internetofwater.app?f=html" }, { "rel":"self", "type":"application/geo+json", "title":"This document as JSON", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/4709018?f=json" }, { "rel":"alternate", "type":"application/ld+json", "title":"This document as RDF (JSON-LD)", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/4709018?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/4709018?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }