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"name":"Norfork Dam", "hasResopsAverages":"true", "nidId":"AR00159", "nidid":"", "levels":[ { "slug":"elev.bottom of normal", "label":"Bottom of Normal", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Norfork_Dam.Elev-Pool.Inst.0.Bottom of Normal", "latest_value":510, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Norfork_Dam.Elev-Pool.Inst.0.Streambed", "latest_value":374, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Norfork_Dam.Elev-Pool.Inst.0.Top of Conservation", "latest_value":553.75, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Norfork_Dam.Elev-Pool.Inst.0.Top of Dam", "latest_value":590, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Norfork_Dam.Elev-Pool.Inst.0.Top of Flood", "latest_value":580, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Norfork_Dam.Elev-Pool.Inst.0.Top of Inactive", "latest_value":510, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of normal", "label":"Top of Normal", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"Norfork_Dam.Elev-Pool.Inst.0.Top of Normal", "latest_value":553.75, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of normal", "label":"Bottom of Normal", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"Norfork_Dam.Stor-Res.Inst.0.Bottom of Normal", "latest_value":544200, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"Norfork_Dam.Stor-Res.Inst.0.Top of Conservation", "latest_value":1218034, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"Norfork_Dam.Stor-Res.Inst.0.Top of Flood", "latest_value":1888448, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"Norfork_Dam.Stor-Res.Inst.0.Top of Inactive", "latest_value":509243, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549795, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":216, "damLength":2624, "distance":null, "drainageArea":1806, "eapId":1, "dsacAssignedDate":"2015-08-04T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-05-02T12:00:00.000Z", "eapLastRevDate":"2023-10-12T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"AR00159", "oldFederalId":"AR00159", "hazardId":4, "hydraulicHeight":206, "inspectionAuthorityId":0, "inspectionDate":"2024-06-05T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":36.24957169, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-92.238257128, "maxDischarge":331000, "maxStorage":1983000, "nidHeight":248, "nidStorage":1983000, "normalStorage":31000, "numberOfLocks":0, "operationalStatusDate":"2015-08-04T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) designed and built Norfork Dam between 1940 and 1944 for flood risk management, water supply, water quality control, irrigation, recreation, and fish and wildlife. Norfork Lake and Dam are major units in a comprehensive plan for the development of the water resources of the White River Basin in Missouri and Arkansas. Norfork Dam is in north central Arkansas on the Norfork River, 4.8 miles upstream from its confluence with the White River in Baxter County, Arkansas. Norfork Lake is in Baxter County, Arkansas and Ozark County, Missouri. The lake is one of a series of five lakes in the Upper White River Basin in northern Arkansas and southern Missouri. The nearest communities are Salesvale, Arkansas,1.5 miles downstream; Norfork, Arkansas, 4.5 river miles downstream; Calico Rock, Arkansas, 16.2 river miles downstream; and Batesville, Arkansas, 75 river miles downstream of the dam. \n\nThe main components of the project are a concrete dam section, which serves as the main water barrier; a concrete gated spillway, a segment of the structure used to provide additional controlled release of water from the dam during major flood events; and hydropower facilities.", "riskCharSummary":"USACE completed a risk assessment for Norfork Dam in June 2024 that characterizes the risks associated with the project as moderate. The dam significantly reduces the risk of flooding to surrounding communities. However, it does not entirely eliminate the risk. Although the Norfork Dam has historically performed well, extreme rainfall and earthquake events may cause areas downstream to be flooded. Even when the dam operates as intended, downstream flooding could still occur if a very large rainfall event were to require unusually large quantities of water to be released through the dam gates. In extreme cases, this flooding could be similar to what was experienced prior to the dam\u2019s construction. Norfork Dam has an Emergency Action Plan and Risk Reduction Plan in place to lower the risk of life loss if any of these scenarios occurred.", "riskManagementMeasures":"USACE actively monitors Norfork Dam and implements a comprehensive risk reduction program to address these potential risks. Project personnel receive regular dam safety training, and the Emergency Action Plan (EAP) is maintained and updated \u2013 most recently in 2024. Emergency preparedness is reinforced through regular exercises, such as a tabletop exercise conducted in September 2023 with local, state, and federal emergency managers. Additional risk reduction measures include improved communication plans, increased public education, downstream warning systems, and ongoing monitoring of dam performance. These efforts are reviewed annually to ensure their effectiveness in protecting downstream communities.", "riverName":"NORTH FORK OF THE WHITE", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":480, "stateFedId":"AR00159", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":248, "submitDate":"2023-05-12T00:00:00.000Z", "surfaceArea":22000, "volume":1500000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1944, "congDist":"Congressional District 01, Arkansas", "city":"NORFORK", "county":"Baxter", "aiannh":null, "websiteUrl":"https://www.swl.usace.army.mil/Missions/Recreation/Lakes/Norfork-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":"Norfork Lake", "ownerNames":"USACE - Little Rock District", "ownerTypeIds":"3", "primaryDamTypeId":11, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;4;5;6;8", "dsacId":3, "femaRegion":"6", "lastEapExcerDate":"2024-03-13T12:00:00.000Z", "dataUpdated":"2025-06-03T12:00:00.000Z", "usaceDistrict":"Little Rock District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"110100", "doi_region":null, "doi_region_name":"Mississippi Basin", "doi_region_number":4, "thirtyYearAverage":1623.9329, "tenthPercentile":1488.825, "ninetiethPercentile":1776.2286 }, "id":2211150, "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/2211150?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/2211150?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/2211150?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }