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{ "tsid":"MARI.Elev.Inst.1Hour.0.Ccp-Rev", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":1350.17, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"MARI.Flow-Res Out.Inst.1Hour.0.Rev-Regi-Flowgroup", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Res Out", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":98.47, "delta24h":null, "sort_order":7, "results":null } ], "name":"Marion Lake", "hasResopsAverages":"true", "nidId":"KS00006", "nidid":"", "levels":[ { "slug":"elev.24-hr surveillance begins", "label":"24-hr Surveillance Begins", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MARI.Elev.Inst.0.24-hr Surveillance Begins", "latest_value":1356, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.bottom of conservation", "label":"Bottom of Conservation", "parameter":"Elev", 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"units":"ft", "units_long_name":"Feet" }, { "slug":"elev.pool of record", "label":"Pool of Record", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MARI.Elev.Inst.0.Pool of Record", "latest_value":1358.87, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.spillway crest", "label":"Spillway Crest", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MARI.Elev.Inst.0.Spillway Crest", "latest_value":1318.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MARI.Elev.Inst.0.Streambed", "latest_value":1301, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MARI.Elev.Inst.0.Top of Conservation", "latest_value":1350.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of constant conservation", "label":"Top of Constant Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MARI.Elev.Inst.0.Top of Constant Conservation", "latest_value":1350.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MARI.Elev.Inst.0.Top of Dam", "latest_value":1368, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MARI.Elev.Inst.0.Top of Flood", "latest_value":1358.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MARI.Elev.Inst.0.Top of Inactive", "latest_value":1320, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of induced surcharge", "label":"Top of Induced Surcharge", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MARI.Elev.Inst.0.Top of Induced Surcharge", "latest_value":1360, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of normal", "label":"Top of Normal", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MARI.Elev.Inst.0.Top of Normal", "latest_value":1350.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of normal", "label":"Bottom of Normal", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MARI.Stor.Inst.0.Bottom of Normal", "latest_value":11, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MARI.Stor.Inst.0.Top of Conservation", "latest_value":76837, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MARI.Stor.Inst.0.Top of Dam", "latest_value":250365, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MARI.Stor.Inst.0.Top of Flood", "latest_value":139960, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MARI.Stor.Inst.0.Top of Inactive", "latest_value":0.09, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of induced surcharge", "label":"Top of Induced Surcharge", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MARI.Stor.Inst.0.Top of Induced Surcharge", "latest_value":157210, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550317, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":67, "damLength":8375, "distance":null, "drainageArea":200, "eapId":1, "dsacAssignedDate":"2025-05-09T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-07-23T12:00:00.000Z", "eapLastRevDate":"2022-06-01T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"KS00006", "oldFederalId":"KS00006", "hazardId":4, "hydraulicHeight":62, "inspectionAuthorityId":0, "inspectionDate":"2024-04-22T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":38.3691210120001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-97.084736689, "maxDischarge":132000, "maxStorage":189200, "nidHeight":67, "nidStorage":189200, "normalStorage":80680, "numberOfLocks":0, "operationalStatusDate":"2015-04-02T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The United States Army Corps of Engineers completed construction of Marion Dam River Dam in 1968 with the primary purpose to reduce flooding in downstream communities as well as water quality, water supply, fish and wildlife, and recreation. Marion Dam is located in east central Kansas approximately 5 miles northwest of the town of Marion, Kansas, on the Cottonwood River, a tributary of the Grand (Neosho) River. The dam consists of an earth-fill embankment, an earthen dike connecting to U.S. Highway 56, an earthen dike on the west side of U.S. Highway 56, and a concrete gated spillway. During large storm events, the dam holds back excess water to reduce flooding downstream. This stored water can then be released from the gated spillway in a more controlled manner to reduce dangerous flooding downstream.", "riskCharSummary":"USACE completed a risk assessment for Marion Dam in 2025, and classified the risk associated with the dam as low. The risk is driven primarily by 1.) the potential for water flowing through the foundation sands beneath the dam to lead to erosion and breach and 2.) the potential for failure of the anchorage that holds the gates in place leading to uncontrolled release and loss of reservoir. Failure of the dam would include flooding downstream resulting in loss of life and economic impacts. In the remote event of a dam failure, the towns of Marion, Florence, Cedar Point, Elmdale, and Strong City would be impacted. The levees in Marion and Florence would be overtopped for a breach from maximum pool. Portions of Cedar Point and Strong City would be inundated for breaches from top of flood pool and from maximum pool, while Elmdale would be completely inundated for both breach scenarios.\n\nThere are also risks associated with planned releases due to a large flood inflow. Spillway releases would not overtop downstream levees. The maximum non-breach release would inundate Cedar Point, Elmdale, and Strong City. There would be significant warning of a large flood of this magnitude, but life loss would still be possible given the extent of flooding.", "riskManagementMeasures":"There are numerous activities that USACE conducts to help manage the risk that Marion Dam poses to downstream communities. These include conducting emergency exercises with local and state emergency responders to enhance evacuation planning, yearly updates to the Emergency Action Plan, and development of a detailed communication plan for the dam. The dam is well maintained through continuous operations and maintenance activities, and USACE conducts detailed inspections of the dam during both normal lake levels and flood events to ensure the integrity of the structure. Lastly, the dam has a robust instrumentation and monitoring program to allow USACE staff to evaluate the dam for changing conditions.", "riverName":"COTTONWOOD RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":136, "stateFedId":"KS00006", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":67, "submitDate":"2023-02-16T17:25:42.470Z", "surfaceArea":6210, "volume":1292157, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1968, "congDist":"Congressional District 02, Kansas", "city":"MARION", "county":"Marion", "aiannh":null, "websiteUrl":"https://www.swt.usace.army.mil/Locations/Tulsa-District-Lakes/Kansas/Marion-Reservoir/", "coreTypeIds":"3", "damTypeIds":"9;8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":"Marion Lake", "foundationTypeIds":"1;3", "nonFederalDamOnFederalId":0, "designerNames":"CESWT", "otherNames":"Marion Reservoir", "ownerNames":"USACE - Tulsa District", "ownerTypeIds":"3", "primaryDamTypeId":9, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;5;8", "dsacId":4, "femaRegion":"7", "lastEapExcerDate":"2024-07-23T12:00:00.000Z", "dataUpdated":"2025-07-15T14:44:42.557Z", "usaceDistrict":"Tulsa District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"110702", "doi_region":"MB", "doi_region_name":"Missouri Basin", "doi_region_number":5, "thirtyYearAverage":92.8727, "tenthPercentile":82.9418, "ninetiethPercentile":102.1238 }, "id":1799051, "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/1799051?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/1799051?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/1799051?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }