{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -93.16033, 34.95206 ] }, "properties":{ "provider":"SWL", "code":"Nimrod_Dam", "slug":"nimrod_dam", "elevation":0.0, "horizontal_datum":"NAD83", "vertical_datum":"NGVD29", "state":"AR", "kind":"PROJECT", "nearest_city":"Hollis", "public_name":"Nimrod Dam", "location_code":565098150, "nsid":null, "aliases":{ "CWMS Legacy Naming":"Nimrod_Dam", "NIDID":"AR00158", "CWMS Standard Naming":"Nimrod_Dam" }, "timeseries":[ { "tsid":"Nimrod_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":"Nimrod_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":"Nimrod_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":6.39, "delta24h":null, "sort_order":16, "results":null }, { "tsid":"Nimrod_Dam-Tailwater.Elev-Downstream.Inst.1Hour.0.Decodes-rev", "label":"Elevation Tailwater", "base_parameter":"Elev", "parameter":"Elev-Downstream", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":306.82, "delta24h":null, "sort_order":3, "results":null }, { "tsid":"Nimrod_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":345.42, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"Nimrod_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":0.7, "delta24h":null, "sort_order":12, "results":null }, { "tsid":"Nimrod_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":43094.8, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"Nimrod_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":43094.8, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"Nimrod_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":236.47, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"Nimrod_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":211.43, "delta24h":null, "sort_order":6, "results":null } ], "name":"Nimrod Dam", "hasResopsAverages":"true", "nidId":"AR00158", "nidid":"", "levels":[ { "slug":"elev.bottom of normal", "label":"Bottom of Normal", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Nimrod_Dam.Elev-Pool.Inst.0.Bottom of Normal", "latest_value":315, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Nimrod_Dam.Elev-Pool.Inst.0.Streambed", "latest_value":320, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Nimrod_Dam.Elev-Pool.Inst.0.Top of Conservation", "latest_value":345, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Nimrod_Dam.Elev-Pool.Inst.0.Top of Dam", "latest_value":400, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Nimrod_Dam.Elev-Pool.Inst.0.Top of Flood", "latest_value":373, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Nimrod_Dam.Elev-Pool.Inst.0.Top of Inactive", "latest_value":315, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of normal", "label":"Bottom of Normal", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"Nimrod_Dam.Stor-Res.Inst.0.Bottom of Normal", "latest_value":889.81, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"Nimrod_Dam.Stor-Res.Inst.0.Top of Conservation", "latest_value":41020, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"Nimrod_Dam.Stor-Res.Inst.0.Top of Flood", "latest_value":336010, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"Nimrod_Dam.Stor-Res.Inst.0.Top of Inactive", "latest_value":890, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549794, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":97, "damLength":1012, "distance":null, "drainageArea":680, "eapId":1, "dsacAssignedDate":"2022-05-24T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-05-02T12:00:00.000Z", "eapLastRevDate":"2023-06-06T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"AR00158", "oldFederalId":"AR00158", "hazardId":4, "hydraulicHeight":70, "inspectionAuthorityId":0, "inspectionDate":"2021-02-15T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":34.952015353, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-93.160435107, "maxDischarge":49000, "maxStorage":336000, "nidHeight":103, "nidStorage":336000, "normalStorage":29000, "numberOfLocks":0, "operationalStatusDate":"2022-05-24T12:00:00.000Z", "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 Nimrod Dam in February 2021 that characterizes the risks associated with the project as low based on good performance and the design of the dam. The dam significantly reduces the risk of flooding to surrounding communities. However, it does not eliminate the risk. The initial Screening Portfolio Risk Assessment (SPRA), conducted in 2008, identified downstream erosion of the left toe due to a PMF overtopping event (6 feet above the dam) and some minor abutment seepage as the main concerns. The 2021 risk assessment identified the same concerns: an overtopping PMF event (6 feet above the dam) leading to downstream toe erosion and monolith overturning. Other concerns include aging electrical and hydraulic systems that could lead to loss of gate control.", "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 July 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":"FOURCHE LA FAVE", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":198, "stateFedId":"AR00158", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":103, "submitDate":"2023-05-31T00:00:00.000Z", "surfaceArea":3550, "volume":104400, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1942, "congDist":"Congressional District 02, Arkansas", "city":"PERRYVILLE", "county":"Perry", "aiannh":null, "websiteUrl":"https://www.swl.usace.army.mil/Missions/Recreation/Lakes/Nimrod-Lake/", "coreTypeIds":"2", "damTypeIds":"11;9", "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":"Nimrod Lake", "ownerNames":"USACE - Little Rock District", "ownerTypeIds":"3", "primaryDamTypeId":11, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;5;8", "dsacId":5, "femaRegion":"6", "lastEapExcerDate":"2024-02-14T12:00:00.000Z", "dataUpdated":"2025-03-19T12:00:00.000Z", "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":91.8623, "tenthPercentile":42.3328, "ninetiethPercentile":154.7896 }, "id":565098150, "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/565098150?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/565098150?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/565098150?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }