{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -86.65667, 36.29417 ] }, "properties":{ "provider":"LRN", "code":"OHHT1", "slug":"ohht1", "elevation":0.0, "horizontal_datum":"NAD83", "vertical_datum":"NGVD29", "state":"TN", "kind":"PROJECT", "nearest_city":"Hendersonville", "public_name":"Old Hickory Lock and Dam Headwater", "location_code":2637010, "nsid":null, "aliases":{ "NID Dam Name":"Old Hickory", "CWMS Legacy Naming":"OHHT1", "CWMS Standard Naming":"OHHT1", "NIDID":"TN03702" }, "timeseries":[ { "tsid":"OHHT1-OLD_HICKORY.Elev-Tail.Inst.1Hour.0.man-rev", "label":"Elevation Tailwater", "base_parameter":"Elev", "parameter":"Elev-Tail", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T23:00:00Z", "latest_value":389.41, "delta24h":null, "sort_order":3, "results":null }, { "tsid":"OHHT1-OLD_HICKORY.Precip-Inc.Total.15Minutes.15Minutes.dcp-rev", "label":"Precipitation", "base_parameter":"Precip", "parameter":"Precip-Inc", 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"slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev", "base_parameter":"Elev", "tsid":"OHHT1.Elev.Inst.0.Top of Inactive", "latest_value":442, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of induced surcharge", "label":"Top of Induced Surcharge", "parameter":"Elev", "base_parameter":"Elev", "tsid":"OHHT1.Elev.Inst.0.Top of Induced Surcharge", "latest_value":450, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of power", "label":"Top of Power", "parameter":"Elev", "base_parameter":"Elev", "tsid":"OHHT1.Elev.Inst.0.Top of Power", "latest_value":445, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of flood", "label":"Bottom of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"OHHT1.Stor.Inst.0.Bottom of Flood", "latest_value":420000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.bottom of power", "label":"Bottom of Power", "parameter":"Stor", "base_parameter":"Stor", "tsid":"OHHT1.Stor.Inst.0.Bottom of Power", "latest_value":357000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"OHHT1.Stor.Inst.0.Top of Dam", "latest_value":695000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"OHHT1.Stor.Inst.0.Top of Flood", "latest_value":545000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"OHHT1.Stor.Inst.0.Top of Inactive", "latest_value":357000, "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":"OHHT1.Stor.Inst.0.Top of Induced Surcharge", "latest_value":545000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of power", "label":"Top of Power", "parameter":"Stor", "base_parameter":"Stor", "tsid":"OHHT1.Stor.Inst.0.Top of Power", "latest_value":420000, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550009, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":3750, "distance":null, "drainageArea":11674, "eapId":1, "dsacAssignedDate":"2019-04-25T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-07-15T12:00:00.000Z", "eapLastRevDate":"2023-01-13T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"TN03702", "oldFederalId":"TN03702", "hazardId":4, "hydraulicHeight":83, "inspectionAuthorityId":0, "inspectionDate":"2023-06-13T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":36.296401583, "lengthOfLocks":400, "secondaryLengthOfLocks":null, "longitude":-86.655926197, "maxDischarge":236000, "maxStorage":545000, "nidHeight":98, "nidStorage":545000, "normalStorage":420000, "numberOfLocks":1, "operationalStatusDate":"2019-04-25T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) completed construction of the Old Hickory Lock and Dam in June of 1954 with the powerhouse being completed in December of 1957. The dam is located in Davidson and Sumner Counties, TN on the Cumberland River approximately 216 river miles above its confluence with the Ohio River. The project was authorized by the Rivers and Harbors Act of 1946 as a unit of a comprehensive development plan for the Cumberland River Basin. and is managed by the Nashville District, USACE. Old Hickory Lake is a mainstream storage impoundment on the Cumberland River operated by the Corps of Engineers. The dam has a maximum height of 40 feet, a total length of 3,750 feet, and consists of a concrete gravity section, earthen embankment, powerhouse, and lock. Old Hickory Lock and Dam impounds Old Hickory Lake which has a total storage capacity of 545,000 acre-ft. In addition to its originally authorized purposes of navigation and hydropower, Old Hickory Lock and Dam provides recreation, minor flood control, fish and wildlife, water supply, and water quality benefits for the basin and region.", "riskCharSummary":"The project risk is currently driven by the consequences of an overtopping failure of the compacted clay embankment. The major damage center impacted by a failure of Old Hickory would be Nashville, with the area between Old Hickory through Davidson County being urban with a significant population. Further downstream into Cheatham and Dickson Counties, the areas impacted are predominantly rural. The population at risk is estimated to be 30,000. There are currently no operating restrictions in place and no plans to change how water releases are managed.", "riskManagementMeasures":"USACE is continually taking significant steps to reduce the risk to the public. This includes working closely with local emergency managers, regularly updating the Emergency Action Plan, and conducting emergency exercises with state and local response teams. All dam safety staff are regularly trained to monitor and evaluate the condition of the dam based on key risk components. USACE regularly inspects and monitors instruments to check the health of the dam and increase the frequency of this monitoring during lake levels rises. This ensures that the structure is performing as designed and could help detect any areas of potential concern. Regular maintenance and repairs are performed as needed to keep the dam functioning properly.", "riverName":"CUMBERLAND RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":270, "stateFedId":"TN03702", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":98, "submitDate":"2023-09-21T15:57:44.233Z", "surfaceArea":22500, "volume":791000, "widthOfLocks":84, "secondaryWidthOfLocks":null, "yearCompleted":1954, "congDist":"Congressional District 06, Tennessee", "city":"NASHVILLE", "county":"Davidson", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":"3", "damTypeIds":"11;8;9", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"1", "nonFederalDamOnFederalId":0, "designerNames":"CELRN", "otherNames":"Old Hickory Lake", "ownerNames":"USACE - Nashville District", "ownerTypeIds":"3", "primaryDamTypeId":11, "primaryOwnerTypeId":3, "primaryPurposeId":3, "purposeIds":"3;12;5;6;8", "dsacId":3, "femaRegion":"4", "lastEapExcerDate":"2024-05-30T12:00:00.000Z", "dataUpdated":"2025-01-27T12:00:00.000Z", "usaceDistrict":"Nashville District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"051302", "doi_region":null, "doi_region_name":"South Atlantic Gulf", "doi_region_number":2, "thirtyYearAverage":515.248, "tenthPercentile":502.917, "ninetiethPercentile":525.6706 }, "id":2637010, "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/2637010?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/2637010?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/2637010?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }