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"units_long_name":"Acre-feet" }, { "slug":"stor.top of induced surcharge", "label":"Top of Induced Surcharge", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Hartwell.Stor.Inst.0.Top of Induced Surcharge", "latest_value":3430000, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549705, "associatedStructuresCount":2, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":155, "damLength":17852, "distance":8, "drainageArea":2088, "eapId":1, "dsacAssignedDate":"2023-06-12T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2023-11-08T12:00:00.000Z", "eapLastRevDate":"2022-07-14T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"GA01702", "oldFederalId":"GA01702", "hazardId":4, "hydraulicHeight":199, "inspectionAuthorityId":0, "inspectionDate":"2022-04-06T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":34.3577582770001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-82.821427926, "maxDischarge":565000, "maxStorage":3438700, "nidHeight":204, "nidStorage":3438700, "normalStorage":2550000, "numberOfLocks":0, "operationalStatusDate":"2023-06-12T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) completed construction of the Hartwell Dam and Lake in 1962. The dam was built across the Savannah River on the Georgia/South Carolina border in the counties of Hart (Georgia) and Anderson (South Carolina), and 89 miles upstream of the city of Augusta, Georgia. There were several original purposes for the construction: flood risk reduction, hydropower production, and navigation. The dam is operated as a system in conjunction with two other USACE dams located downstream of Hartwell Dam and upstream of Augusta: Richard B. Russell and J. Strom Thurmond. The system of dams aids in the reduction of downstream flooding by holding back water during major storm events. The Hartwell Dam structure consists of a large concrete dam section with earthen embankments on either side. A gated spillway exists within the concrete section. The spillway contains 12 large, rotating gates called Tainter gates that can pass large volumes of water through the dam. As the gates are raised, the dam can store more water within the reservoir which further minimizes downstream flooding. Since construction of the dam, the spillway gates have only been opened four times due to flooding. Altogether, Thurmond, Russell, and Hartwell dams have prevented approximately $370 million in flood damages since construction. The Hartwell Dam hydropower plant produces an average annual output of 510,000 megawatt-hours of electrical energy. In addition to flood risk reduction, hydropower production, and navigation, Hartwell Dam and Lake was later authorized for the following purposes: water supply, water quality, fish and wildlife management, and recreation. Hartwell Lake has become an extremely popular recreation location with 9.2 million visitors each year.", "riskCharSummary":"USACE completed a risk assessment for Hartwell Dam in June 2023. The assessment characterizes the risk of the project as low. The dam significantly reduces the risk of flooding to downstream communities. However, it does not entirely eliminate the risk. During large storm events, Hartwell Dam\u2019s spillway gates will be opened to keep the reservoir level below the top of the spillway gates. Hartwell\u2019s spillway moves water from Hartwell Lake to the immediately downstream Richard B. Russell Lake. Russell Lake can contain some of the water, but the excess will be passed by Russell\u2019s spillway to the immediately downstream J. Strom Thurmond Lake. Just downstream of Thurmond Dam and Lake is a large population of the city of Augusta, Georgia. Thurmond Dam is able to aid in mitigation of flooding of this downstream population by slowing down releases and allowing time for the city to begin preliminary evacuations and set Augusta Levee closures. During an extreme storm event, an exceedingly large flow may need to be passed through Hartwell\u2019s, Russell\u2019s, and Thurmond\u2019s spillways to prevent the lakes from reaching the top of the dams. These rare events will result in river flows that could overtop the Augusta Levee and impact widespread areas downstream of the dam with dangerous flood waters. It should be noted that Hartwell\u2019s spillway gates have only been opened four times due to flooding, and the amount of flow passed through the dam has been minimal. Hartwell Dam is well maintained and has historically performed well with no issues of immediate concern. However, there is a slight chance that high lake levels may result in a breach of one of the embankments resulting in deep and swift downstream flooding. This is an unlikely event, but one that should be considered as a possibility.", "riskManagementMeasures":"USACE is continuously taking action to prepare for emergency incidents. This includes working closely with local emergency managers, regularly updating the Emergency Action Plan, and conducting emergency exercises with state and local response teams. USACE engineers and project personnel perform regular inspections of the dam and evaluate the dam\u2019s instrumentation. These inspections and instrumentation evaluations are used to assess how the dam is performing. The frequency of the inspections and instrumentation checks increases as the Hartwell Lake pool level rises in order to detect and identify any potential dam safety issues. Periodic training is conducted with Hartwell Dam project personnel. This training is to help project personnel, that are at the site on a daily basis, to identify the early warning signs of a potential issue with the dam. Regular maintenance and repairs are performed as needed to keep the dam functioning properly. Additionally, USACE works closely with Augusta-Richmond County during flood events. The USACE operations plan for the downstream Thurmond Dam requires a stepped spillway release during major flood events and prospective/impending dam failure events. This allows time for Augusta-Richmond County to close gate structures within the levee and to set levee stoplog closures before the full, required spillway releases are commenced.", "riverName":"SAVANNAH RIVER", "separateStructuresCount":2, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":568, "stateFedId":"GA01702", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":204, "submitDate":"2023-02-16T17:25:41.577Z", "surfaceArea":55950, "volume":5518900, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1962, "congDist":"Congressional District 09, Georgia", "city":"HARTWELL", "county":"Hart", "aiannh":null, "websiteUrl":"https://www.sas.usace.army.mil/About/Divisions-and-Offices/Operations-Division/Hartwell-Dam-and-Lake/", "coreTypeIds":"2", "damTypeIds":"11;8;9", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":null, "nonFederalDamOnFederalId":0, "designerNames":"CESAS", "otherNames":"Hartwell Lake", "ownerNames":"USACE - Savannah District", "ownerTypeIds":"3", "primaryDamTypeId":11, "primaryOwnerTypeId":3, "primaryPurposeId":6, "purposeIds":"6;12;4;5;8;9", "dsacId":4, "femaRegion":"4", "lastEapExcerDate":"2025-05-07T12:00:00.000Z", "dataUpdated":"2025-06-27T12:00:00.000Z", "usaceDistrict":"Savannah District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"030601", "doi_region":null, "doi_region_name":"South Atlantic Gulf", "doi_region_number":2, "thirtyYearAverage":3058.1914, "tenthPercentile":2661.0671, "ninetiethPercentile":3249.6806 }, "id":50040, "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/50040?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/50040?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/50040?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }