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"units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550006, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":43, "damLength":6698, "distance":null, "drainageArea":7573, "eapId":1, "dsacAssignedDate":"2022-08-12T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-09-11T12:00:00.000Z", "eapLastRevDate":"2023-07-25T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"TX00015", "oldFederalId":"TX00015", "hazardId":4, "hydraulicHeight":43, "inspectionAuthorityId":0, "inspectionDate":"2021-05-25T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":30.799916448, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-94.173083504, "maxDischarge":80000, "maxStorage":218200, "nidHeight":45, "nidStorage":218200, "normalStorage":67000, "numberOfLocks":0, "operationalStatusDate":"2022-08-12T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The United States Army Corps of Engineers (USACE) completed construction of Town Bluff Dam in 1951 with the project purpose of re-regulating water releases from Sam Rayburn Dam (upstream), water supply, environmental regulation, recreation, and hydropower. Town Bluff Dam is located on the Neches River about 10 miles southwest of the city of Jasper, Texas. Town Bluff Dam operates in conjunction with Sam Rayburn Dam (National Inventory of Dams TX00011) to provide flood control along the Angelina and Neches River Basin Systems. 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). The project is comprised primarily of a concrete lined earthen embankment (which also serves as an uncontrolled overflow spillway), a gated outlet works with six tainter gates, and a hydropower plant which produces up to 6MWs of power supply for the Southwestern Power Administration. During large storm events, the project operates as a run-of-the-river dam, increasing outflow to match inflow until reaching the top of spillway. When the reservoir elevation exceeds the top of spillway, project releases become uncontrolled until inflows reduce to levels manageable with the gated outlet works. Water control and flood releases are managed in accordance with the approved water control plan by the six tainter gates operated by onsite USACE personnel.", "riskCharSummary":"Although Town Bluff 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 along the Angelina River and/or high-volume inflows along the Neches River resulting in high flows from Town Bluff Dam. High flow, surcharge releases occur when the reservoir's inflow capacity exceeds the downstream channel capacity of 20,000 cfs. Town Bluff Dam is designed as a run-of-the-river dam, increasing outflow initially through the gates and then over the uncontrolled spillway to match inflow without risking the structural integrity of the dam. USACE completed a risk assessment in January 2022 and classified the risk associated with Town Bluff Dam as low. This risk classification is primarily driven by the very low probability for dam failure and the number of large populations at risk below Town Bluff Dam. The risk for breach of Town Bluff Dam was assessed to be related to the potential for erosion of the foundation near the gated spillway structure during periods of higher-than-normal pool levels when required releases are not being made. In the remote event of a dam breach or high-volume surcharge releases the largest impacts would be to the cities of Evadale, Beaumont, and Rose City, 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 not experience overtopping and are expected to 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 or surcharge releases over the uncontrolled spillway could result in catastrophic flooding downstream and include widespread economic impacts and loss of life.", "riskManagementMeasures":"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. We will continue to identify and implement 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 prepositioned materials located at the project site to perform immediate flood fighting activities as necessary.", "riverName":"NECHES RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":6100, "stateFedId":"TX00015", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":45, "submitDate":"2023-10-13T00:00:00.000Z", "surfaceArea":14700, "volume":352800, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1951, "congDist":"Congressional District 36, Texas", "city":"EVADALE", "county":"Jasper", "aiannh":null, "websiteUrl":"https://www.swf-wc.usace.army.mil/townbluff/", "coreTypeIds":"3", "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1;13", "formerNames":"Dam \"B\"", "foundationTypeIds":"3", "nonFederalDamOnFederalId":0, "designerNames":"CESWF", "otherNames":"B.A.Steinhagen Lake", "ownerNames":"USACE - Fort Worth District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":12, "purposeIds":"12;4;5;6;8", "dsacId":4, "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 }, "id":227048, "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/227048?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/227048?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/227048?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }