{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -93.64918, 35.10413 ] }, "properties":{ "provider":"SWL", "code":"Blue_Mtn_Dam", "slug":"blue_mtn_dam", "elevation":0.0, "horizontal_datum":"NAD83", "vertical_datum":"NGVD29", "state":"AR", "kind":"PROJECT", "nearest_city":"Waveland", "public_name":"Blue Mountain Dam", "location_code":562151150, "nsid":null, "aliases":{ "CWMS Legacy Naming":"Blue_Mtn_Dam", "NIDID":"AR00157", "CWMS Standard Naming":"Blue_Mtn_Dam" }, "timeseries":[ { "tsid":"Blue_Mtn_Dam.Precip-Cum.Inst.1Hour.0.Decodes-rev", "label":"Precipitation", "base_parameter":"Precip", "parameter":"Precip-Cum", "unit":"in", "unit_long_name":"Inches", "latest_time":"2026-04-14T22:00:00Z", "latest_value":4.97, "delta24h":null, "sort_order":16, "results":null }, { "tsid":"Blue_Mtn_Dam-Headwater.%-Conservation Pool.Inst.1Hour.0.CCP-Comp", "label":"Percent Conservation Pool", "base_parameter":"%", "parameter":"%-Conservation Pool", "unit":"%", "unit_long_name":"Percent", "latest_time":"2026-04-14T22:00:00Z", "latest_value":100.0, "delta24h":null, "sort_order":14, "results":null }, { "tsid":"Blue_Mtn_Dam-Headwater.%-Flood Pool.Inst.1Hour.0.CCP-Comp", "label":"Percent Flood Pool", "base_parameter":"%", "parameter":"%-Flood Pool", "unit":"%", "unit_long_name":"Percent", "latest_time":"2026-04-14T22:00:00Z", "latest_value":0.69, "delta24h":null, "sort_order":12, "results":null }, { "tsid":"Blue_Mtn_Dam.Flow-Res In.Ave.1Hour.1Hour.6hr-RunAve-A2W", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow-Res In", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":144.31, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"Blue_Mtn_Dam-Headwater.Stor-Res.Inst.1Hour.0.CCP-Comp", "label":"Flood Storage", "base_parameter":"Stor", "parameter":"Stor-Res", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":35674.01, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"Blue_Mtn_Dam-Headwater.Elev.Inst.1Hour.0.Decodes-rev", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":387.46, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"Blue_Mtn_Dam-Headwater.Stor-Res.Inst.1Hour.0.CCP-Comp", "label":"Conservation Storage", "base_parameter":"Stor", "parameter":"Stor-Res", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":35674.01, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"Blue_Mtn_Dam.Flow-Uncontrolled.Ave.1Hour.1Hour.Regi-Comp", "label":"Surcharge Release", "base_parameter":"Flow", "parameter":"Flow-Uncontrolled", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":0.0, "delta24h":null, "sort_order":8, "results":null }, { "tsid":"Blue_Mtn_Dam.Flow-Res Out.Ave.1Hour.1Hour.Regi-Comp", "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":330.83, "delta24h":null, "sort_order":7, "results":null } ], "name":"Blue Mountain Dam", "hasResopsAverages":"true", "nidId":"AR00157", "nidid":"", "levels":[ { "slug":"elev.bottom of normal", "label":"Bottom of Normal", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Blue_Mtn_Dam.Elev-Pool.Inst.0.Bottom of Normal", "latest_value":367, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Blue_Mtn_Dam.Elev-Pool.Inst.0.Streambed", "latest_value":337, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Blue_Mtn_Dam.Elev-Pool.Inst.0.Top of Conservation", "latest_value":387, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Blue_Mtn_Dam.Elev-Pool.Inst.0.Top of Dam", "latest_value":452, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Blue_Mtn_Dam.Elev-Pool.Inst.0.Top of Flood", "latest_value":419, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Blue_Mtn_Dam.Elev-Pool.Inst.0.Top of Inactive", "latest_value":367, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of normal", "label":"Bottom of Normal", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"Blue_Mtn_Dam.Stor-Res.Inst.0.Bottom of Normal", "latest_value":1210, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"Blue_Mtn_Dam.Stor-Res.Inst.0.Top of Conservation", "latest_value":34130, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"Blue_Mtn_Dam.Stor-Res.Inst.0.Top of Flood", "latest_value":257900, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"Blue_Mtn_Dam.Stor-Res.Inst.0.Top of Inactive", "latest_value":1210, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549793, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":115, "damLength":2800, "distance":null, "drainageArea":488, "eapId":1, "dsacAssignedDate":"2022-08-12T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-05-02T12:00:00.000Z", "eapLastRevDate":"2023-06-06T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"AR00157", "oldFederalId":"AR00157", "hazardId":4, "hydraulicHeight":81, "inspectionAuthorityId":0, "inspectionDate":"2021-06-15T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":35.1042468760001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-93.649148939, "maxDischarge":76300, "maxStorage":258000, "nidHeight":115, "nidStorage":258000, "normalStorage":25000, "numberOfLocks":0, "operationalStatusDate":"2022-08-12T12:00:00.000Z", "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. A dam is an earthen embankment and/or solid concrete structure that is built across a river, stream, or other waterway to temporarily hold back and store water that would otherwise flow downstream. More detail related to this specific dam will be added at a future time.", "riskCharSummary":"USACE completed a risk assessment for Blue Mountain Dam in June 2021 that characterizes the risks associated with the project as low based on good performance and the design of the dam.\nThe dam significantly reduces the risk of flooding to surrounding communities, but it does not eliminate it. The initial Screening Portfolio Risk Assessment (SPRA), conducted in 2008, identified overtopping, spillway chute failure, and seepage and piping of the embankment as potential failure modes. It was recommended the dam be categorized as a Dam Safety Action Classification (DSAC) 4. \nThe 2021 risk assessment confirmed that overtopping remains the primary risk driver of the project, but only under extreme flood conditions \u2013 those exceeding the calculated Probable Maximum Flood (PMF) and at an Annual Exceedance Probability (AEP) of less than 1E-06. \nThe 2008 SPRA also identified internal erosion within the embankment as a risk driver. However, ongoing monitoring and a filter compatible chimney drain intersecting the construction interface is functioning as intended. Similarly, the chute walls are considered stable and unlikely to fail due to the tie-in of the walls to high ground. No other failure modes were identified as posing a risk to the project. The dam maintains a DSAC 4 rating.", "riskManagementMeasures":"Dam safety training of project operation and maintenance for project personnel was conducted in May 2017. The Emergency Action Plan (EAP) is maintained and regularly updated. The EAP was last updated in December 2020. A tabletop exercise was conducted in March 2018. Participants included Little Rock District Emergency Management and Infrastructure Safety staff, and state and local emergency management officials. Since the project is currently categorized as DSAC 4, an Interim Risk-Reduction Measures Plan (IRRMP) is not required. Routine dam safety activities and normal operations, maintenance, monitoring, and evaluation are considered appropriate.", "riverName":"PETIT JEAN", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":150, "stateFedId":"AR00157", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":115, "submitDate":"2023-02-16T00:00:00.000Z", "surfaceArea":2910, "volume":1600000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1947, "congDist":"Congressional District 04, Arkansas", "city":"DANVILLE", "county":"Yell", "aiannh":null, "websiteUrl":"https://www.swl.usace.army.mil/Missions/Recreation/Lakes/Blue-Mountain-Lake/Dam-and-Lake-Information/", "coreTypeIds":"3", "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"1", "nonFederalDamOnFederalId":0, "designerNames":"CESWL", "otherNames":"Blue Mountain Lake", "ownerNames":"USACE - Little Rock District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;5;8", "dsacId":4, "femaRegion":"6", "lastEapExcerDate":"2024-02-14T12:00:00.000Z", "dataUpdated":"2025-04-10T12:00:00.000Z", "usaceDistrict":"Little Rock District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"111102", "doi_region":null, "doi_region_name":"Mississippi Basin", "doi_region_number":4, "thirtyYearAverage":75.3165, "tenthPercentile":42.4798, "ninetiethPercentile":113.7172 }, "id":562151150, "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/562151150?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/562151150?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/562151150?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }