{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -95.70823, 38.51065 ] }, "properties":{ "provider":"NWK", "code":"MELN", "slug":"meln", "elevation":null, "horizontal_datum":"WGS84", "vertical_datum":"", "state":"KS", "kind":"PROJECT", "nearest_city":"Ottawa", "public_name":"Melvern Dam & Reservoir", "location_code":15302030, "nsid":null, "aliases":{ "NIDID":"KS00007", "NWS Handbook 5 ID":"MLVK1" }, "timeseries":[ { "tsid":"MELN.Flow-In.Ave.1Day.1Day.Best-NWK", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow-In", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T12:00:00Z", "latest_value":400.0, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"MELN.Stor.Inst.1Hour.0.Best-NWK", "label":"Flood Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":142839.92, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"MELN.Flow-Out.Ave.1Day.1Day.Best-NWK", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Out", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T12:00:00Z", "latest_value":20.0, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"MELN.Stor.Inst.1Hour.0.Best-NWK", "label":"Conservation Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":142839.92, "delta24h":null, "sort_order":13, "results":null } ], "name":"Melvern Dam & Reservoir", "hasResopsAverages":"true", "nidId":"KS00007", "nidid":"", "levels":[ { "slug":"elev.bottom of conservation", "label":"Bottom of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MELN.Elev.Inst.0.Bottom of Conservation", "latest_value":969, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.spillway crest", "label":"Spillway Crest", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MELN.Elev.Inst.0.Spillway Crest", "latest_value":1057, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MELN.Elev.Inst.0.Streambed", "latest_value":959, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MELN.Elev.Inst.0.Top of Conservation", "latest_value":1036, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MELN.Elev.Inst.0.Top of Dam", "latest_value":1078, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MELN.Elev.Inst.0.Top of Flood", "latest_value":1057, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of surcharge", "label":"Top of Surcharge", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MELN.Elev.Inst.0.Top of Surcharge", "latest_value":1073, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of conservation", "label":"Bottom of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MELN.Stor.Inst.0.Bottom of Conservation", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.spillway crest", "label":"Spillway Crest", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MELN.Stor.Inst.0.Spillway Crest", "latest_value":358635, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MELN.Stor.Inst.0.Top of Conservation", "latest_value":149630, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MELN.Stor.Inst.0.Top of Flood", "latest_value":358635, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of surcharge", "label":"Top of Surcharge", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MELN.Stor.Inst.0.Top of Surcharge", "latest_value":656531, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549706, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":9750, "distance":null, "drainageArea":349, "eapId":1, "dsacAssignedDate":"2022-05-23T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-12-02T12:00:00.000Z", "eapLastRevDate":"2020-09-30T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"KS00007", "oldFederalId":"KS00007", "hazardId":4, "hydraulicHeight":123, "inspectionAuthorityId":0, "inspectionDate":"2024-11-07T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":38.5144137440001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-95.713000504, "maxDischarge":35500, "maxStorage":363000, "nidHeight":123, "nidStorage":363000, "normalStorage":154000, "numberOfLocks":0, "operationalStatusDate":"2022-05-23T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) constructed Melvern Dam, completing in May 1973. Melvern Dam is located on the Marais Des Cygnes River, approximately 4 miles upstream of Melvern, KS. Downstream of the dam is agricultural land and the communities of Melvern, KS and Ottawa, KS. The dam was authorized for flood control, water supply, recreation, and fish & wildlife enhancement. Melvern Dam has reduced flood damage by more than an estimated $257 Million (2019 price level) from 1973 to 2019. The dam is 9,750 feet long composed of rolled earthfill. The top of the dam sits approximately 123 feet above the stream bed.", "riskCharSummary":"USACE is confident that the dam is solidly built, well maintained, and will continue to significantly reduce flood risks. However, the dam alone cannot eliminate all flooding. Extreme rainfall events that exceed the Melvern Lake flood storage capacity would cause the release of water through the uncontrolled spillway to prevent overtopping and failure of the dam. This can result in flooding at downstream areas.\n\nUSACE completed a risk assessment for Melvern Dam in May 2020 to determine the ability of USACE to meet the flood risk management goals of the dam. As a result, the risk due to a dam breach is characterized as low. If an extreme flood event occurs, inflows into the reservoir may exceed the storage and release capacity of the dam, and overtopping may occur. Other potential failure modes may lead to a breach of the dam prior to overtopping. If a dam breach occurs this would cause a sudden release of water downstream. This would result in extreme flooding in the agricultural land downstream and the communities of Melvern, KS and Ottawa, KS.", "riskManagementMeasures":"USACE will continue to work closely with state and local emergency managers, conduct emergency exercises and incorporate any new information into our collective emergency action plans. We will continue rigorous monitoring and surveillance of the dam and will do so more frequently when heavy rainfall causes high lake levels. Rainfall forecasts and lake levels are routinely monitored and if a high lake level is forecasted, we will promptly inform local and state emergency managers so that they can take protective actions, make flood warnings, and prepare for emergency responses. We will work with communities that are developing downstream of the dam to help them understand how they can better prepare for a potential flood.", "riverName":"MARAIS DES CYGNES", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":200, "stateFedId":"KS00007", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":98, "submitDate":"2023-02-16T17:25:23.438Z", "surfaceArea":6930, "volume":8000000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1972, "congDist":"Congressional District 02, Kansas", "city":"MELVERN", "county":"Osage", "aiannh":null, "websiteUrl":"https://www.nwk.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/", "coreTypeIds":"3", "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"1;3", "nonFederalDamOnFederalId":0, "designerNames":"CENWK", "otherNames":"Melvern Lake", "ownerNames":"USACE - Kansas City District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;5;8", "dsacId":4, "femaRegion":"7", "lastEapExcerDate":"2025-04-03T12:00:00.000Z", "dataUpdated":"2025-04-14T12:00:00.000Z", "usaceDistrict":"Kansas City District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"102901", "doi_region":"MB", "doi_region_name":"Missouri Basin", "doi_region_number":5, "thirtyYearAverage":183.7584, "tenthPercentile":161.4869, "ninetiethPercentile":207.6628 }, "id":15302030, "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/15302030?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/15302030?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/15302030?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }