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"units_long_name":"Acre-feet" } ], "id":550035, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":120, "damLength":12400, "distance":null, "drainageArea":3449, "eapId":1, "dsacAssignedDate":"2017-05-25T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-04-26T12:00:00.000Z", "eapLastRevDate":"2020-09-23T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"TX00011", "oldFederalId":"TX00011", "hazardId":4, "hydraulicHeight":113, "inspectionAuthorityId":0, "inspectionDate":"2021-03-22T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":31.064456152, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-94.092529637, "maxDischarge":227700, "maxStorage":6520000, "nidHeight":130, "nidStorage":6520000, "normalStorage":2898200, "numberOfLocks":0, "operationalStatusDate":"2017-05-25T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The United States Army Corps of Engineers (USACE) completed construction of Sam Rayburn Dam in 1966 with the project purpose to provide flood risk management, water supply, environmental regulation, recreation, and hydropower. Sam Rayburn Dam is located on the Angelina River about 10 miles northwest of the city of Jasper, Texas. Sam Rayburn Dam and Reservoir operates in conjunction with Town Bluff Dam (National Inventory of Dams TX00015) and B.A. Steinhagen Lake to provide flood control to the Angelina and Neches River Basin System. Since both projects went into operation, they have reduced damage caused by downstream flooding by more than an estimated $2.3 Billion (adjusted to 2020 dollars). Sam Rayburn Dam is primarily an earthen embankment dam with a concrete outlet works and an uncontrolled labyrinth weir spillway, which holds water to 14-feet below the top of the dam to regulate the reservoir when pool elevation exceeds capacity. It also includes a hydropower facility which produces up to 52MWs of power supply for the Southwestern Power Administration. During large storm events, the dam temporarily stores flood waters to manage flooding downstream. After the storm passes and the Neches River Basin recedes, water can be safety released downstream in accordance with the approved water control plan. Water storage and flood releases are managed by the hydroelectric powerhouse and two water control gates operated by onsite USACE personnel.", "riskCharSummary":"Although Sam Rayburn Dam reduces the risk of flooding to downstream communities, the dam does not eliminate the risk of flooding. The most likely scenario that could result in downstream flooding are high volume releases from Sam Rayburn Dam through the outlet works and uncontrolled spillway during high water events. These surcharge operational releases occur when the reservoir's flood storage capacity is exceeded and excess water flows through the spillway. Sam Rayburn Dam is designed to reduce the peak flooding levels downstream without risking the structural integrity of the dam. The United States Army Corps of Engineers (USACE) completed a risk assessment in November 2016 and classified the risk associated with Sam Rayburn Dam as moderate. This risk classification is primarily driven by the very low probability for dam failure and the number of large populations at risk below Sam Rayburn Dam. The potential for breach of Sam Rayburn Dam was assessed to be related to three primary risks associated with earthen embankment dams: 1) During an extreme flood event, erosion may occur at the left abutment leading to eventual breach of the dam, 2) Erosion may occur through the foundation near the old river channel leading to eventual breach of the dam, and 3) Erosion along the interface of the powerhouse facility and main embankment during high reservoir elevations could lead to eventual breach of the dam. In the remote event of a dam breach the largest impacts would be to the cities of Evadale, Beaumont, and Nederland, Texas. Potentially impacted infrastructure includes road networks, electrical substations, communication facilities, water treatment facilities, police and fire stations, hospitals, airports, and schools. Levees in the downstream populated areas would experience overtopping and would not contain the floodwaters. Although the downstream communities have well-practiced emergency action plans; local emergency managers are aware of the unlikely potential for dam failure; and local emergency managers meet regularly with USACE to discuss emergency response to flood events, breach of the dam from either risk category could result in catastrophic flooding downstream and include widespread economic impacts and significant loss of life.", "riskManagementMeasures":"The United States Army Corps of Engineers (USACE) is continually taking proactive steps to reduce risk and ensure public safety. This includes conducting emergency exercises with local and state emergency responders to enhance evacuation planning; annual updates to the Emergency Action Plan to improve emergency response actions; and development of a detailed communications plan for the dam. USACE will continue to identify and implement interim risk reduction measures such as stockpiling materials to mitigate the potential for erosion of the embankment or foundation. Additionally, the dam is well maintained and USACE conducts detailed inspections of the dam during both normal lake levels and increased surveillance during flood events to ensure the integrity of the structure. Lastly, the dam has a robust instrumentation and monitoring system to allow USACE staff to evaluate the dam for changing conditions and there are pre-positioned materials at the project site to perform immediate flood fighting activities as necessary.", "riverName":"ANGELINA RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":680, "stateFedId":"TX00011", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":130, "submitDate":"2023-10-13T17:22:49.351Z", "surfaceArea":114500, "volume":6000000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1965, "congDist":"Congressional District 36, Texas", "city":"EVADALE", "county":"Jasper", "aiannh":null, "websiteUrl":"https://www.swf-wc.usace.army.mil/samray/", "coreTypeIds":"3", "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1;13", "formerNames":"Mcgee Bend Reservoir", "foundationTypeIds":"1;3", "nonFederalDamOnFederalId":0, "designerNames":"CESWF", "otherNames":null, "ownerNames":"USACE - Fort Worth District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;4;5;6;8", "dsacId":3, "femaRegion":"6", "lastEapExcerDate":"2024-12-11T12:00:00.000Z", "dataUpdated":"2025-06-09T12:00:00.000Z", "usaceDistrict":"Fort Worth District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"120200", "doi_region":"ART", "doi_region_name":"Arkansas-Rio Grande-Texas Gulf", "doi_region_number":6, "thirtyYearAverage":3614.7197, "tenthPercentile":3080.158, "ninetiethPercentile":4181.2669 }, "id":223048, "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/223048?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/223048?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/223048?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }