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Conservation", "latest_value":1465000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.bottom of flood", "label":"Bottom of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Thurmond.Stor.Inst.0BOP.Bottom of Flood", "latest_value":1465000, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549707, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":124, "damLength":5680, "distance":22, "drainageArea":6144, "eapId":1, "dsacAssignedDate":"2015-05-15T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2023-11-16T12:00:00.000Z", "eapLastRevDate":"2022-07-14T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"GA01701", "oldFederalId":"GA01701", "hazardId":4, "hydraulicHeight":170, "inspectionAuthorityId":0, "inspectionDate":"2024-06-05T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":33.66117856, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-82.19965703, "maxDischarge":1055000, "maxStorage":3820000, "nidHeight":200, "nidStorage":3820000, "normalStorage":2510000, "numberOfLocks":0, "operationalStatusDate":"2015-05-15T12:00:00.000Z", "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 J. Strom Thurmond Dam and Lake in 1952. The dam, formerly known as Clarks Hill Dam, was built across the Savannah River on the Georgia/South Carolina border in the counties of Columbia (Georgia) and McCormick (South Carolina), and 22 miles upstream of the city of Augusta, Georgia. There were several purposes for the construction: flood risk reduction, navigation of the river below Augusta, and for the production of hydropower. The dam is operated as a system in conjunction with two other USACE dams located immediately upstream of Thurmond Dam: Richard B. Russell and Hartwell. The system of dams aids in the reduction of downstream flooding by holding back water during major storm events. The Thurmond 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 23 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 six times due to flooding. Altogether, Thurmond, Russell, and Hartwell dams have prevented approximately $370 million in flood damages since construction. The Augusta Levee located along the Georgia-side of the Savannah River is a separate but critical feature designed to prevent damages from flooding in the Augusta area. There are other populated areas located outside of the leveed area that would be directly impacted by out-of-bank flows, namely immediately downstream of the dam on the South Carolina side of the river. The Thurmond Dam hydropower plant produces an average annual output of 700 million kilowatt-hours of electrical energy. In addition to flood risk reduction, hydropower, and navigation, Thurmond Dam and Lake also provides benefits via the following: water supply, recreation, water quality, and fish and wildlife management.", "riskCharSummary":"USACE completed a risk assessment for J. Strom Thurmond Dam in May 2015. 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. There is a large population that resides downstream of the dam, particularly within the city of Augusta, Georgia. During large storm events, Thurmond Dam's spillway gates will be opened to keep the reservoir level below the top of the spillway gates. As the gates rise open, the flow in the river downstream is increased and more water is allowed to be held in the reservoir. During an extreme storm event, an exceedingly large flow may need to be passed through Thurmond's spillway to prevent the lake from reaching the top of the dam. 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 Thurmond's spillway gates have only been opened six times due to flooding, and the amount of flow passed through the dam has been minimal. Thurmond 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 or significant earthquake events 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's 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 Thurmond Lake level rises in order to detect and identify any potential dam safety issues. Periodic training is conducted with Thurmond 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 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":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":920, "stateFedId":"GA01701", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":200, "submitDate":"2023-02-16T17:25:42.173Z", "surfaceArea":71000, "volume":4550000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1954, "congDist":"Congressional District 03, South Carolina", "city":"AUGUSTA", "county":"McCormick", "aiannh":null, "websiteUrl":"https://www.sas.usace.army.mil/About/Divisions-and-Offices/Operations-Division/J-Strom-Thurmond-Dam-and-Lake/", "coreTypeIds":"3", "damTypeIds":"11;8;9", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":"Clark Hill Dam & Lake", "foundationTypeIds":"1", "nonFederalDamOnFederalId":0, "designerNames":"CESAS", "otherNames":"J. Strom Thurmond 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":2937.7029, "tenthPercentile":2452.6517, "ninetiethPercentile":3200.1357 }, "id":40, "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/40?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/40?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/40?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }