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"units_long_name":"Acre-feet" } ], "id":550056, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":141, "damLength":14980, "distance":null, "drainageArea":692, "eapId":1, "dsacAssignedDate":"2022-12-21T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-10-02T12:00:00.000Z", "eapLastRevDate":"2021-11-17T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"TX08008", "oldFederalId":"TX08008", "hazardId":4, "hydraulicHeight":136, "inspectionAuthorityId":0, "inspectionDate":"2025-02-18T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":33.3532219360001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-97.05539702, "maxDischarge":14500, "maxStorage":1931900, "nidHeight":141, "nidStorage":1931900, "normalStorage":799600, "numberOfLocks":0, "operationalStatusDate":"2022-12-21T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"Ray Roberts Dam was built by the U.S. Army Corps of Engineers (USACE) in 1987 near Aubrey, Texas. USACE operates the Ray Roberts Dam for flood damage reduction, water supply, recreation, fish and wildlife and water quality. Since it went into operation, the dam has reduced damages caused by downstream flooding by more than an estimated $41.6 billion (adjusted to 2020 dollars). Ray Roberts Dam consists of an earthen embankment that serves as the main water barrier; an outlet works consisting of lifting gates that allow controlled water flow out of the dam; and a spillway that allows water to flow out when water levels within the reservoir exceed the available flood storage. The dam is almost three miles long and as tall as a 14-story building and is made up of rock and soil. The spillway crest is about 20 feet lower than the highest part of the dam and can pass up to 108,500 gallons per second, enough water to flood a football field a foot deep every four seconds.", "riskCharSummary":"Although Ray Roberts 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 due to floodwaters passed through the dam are high volume releases from the operation of Ray Roberts Dam during high water events. These surcharge operational releases occur when the reservoir's flood storage capacity is exceeded causing flooding in areas adjacent to the reservoir and excess water flows through the spillway and/or outlet works. Ray Roberts Dam is designed to reduce the peak flooding levels downstream without risking the structural integrity of the dam. Generally, the Elm Fork Trinity River's large floods are a long-duration type, lasting weeks or even months; however, it is possible that large peak and volume floods could occur within a two-week duration. Despite the flood reduction benefits the dam provides, very rare, severe storms could produce high surcharge releases with the potential to impact the communities of Lewisville, Coppell, Carrollton, Farmers Branch, Irving, and Dallas.\n\nIn May 2019, the U.S. Army Corps of Engineers (USACE) completed a risk assessment to evaluate the potential hazards to the dam, expected performance, and associated consequences and classified the risk associated with Ray Roberts Dam as moderate. Risk for Ray Roberts Dam is driven by an extremely unlikely flood event, unlike anything ever experienced in the area, resulting in water flowing over the top of the dam, potentially leading to erosion of the embankment and an eventual dam breach. While this event is unlikely, consequences include the potential for high loss of life. The primary impacted areas during such an event would be the cities of Denton, Lewisville, Dallas, and the adjacent communities. There would also be significant economic loss and damages to both residential and commercial areas. Should a breach occur flood water released from Ray Roberts Dam would flow into the reservoir at Lewisville Dam (TX00008) and Lake Lewisville would rise rapidly flooding the surrounding communities. The elevated floodwaters would pass through the Lewisville Dam gated outlet structure initially and eventually would flow over the ungated spillway resulting in downstream flooding. Lewisville Dam could also overtop and potentially breach under this scenario and the resulting floodwater would increase downstream damages and the potential for loss of life. It is likely during a flood event of this magnitude the potential risk of overtopping would be forecast in advance. Although large downstream communities have well-practiced emergency action plans; local emergency managers who are aware of the unlikely potential for dam failure; and local emergency managers who meet regularly with USACE to discuss emergency response to flood events, a breach of the dam would jeopardize thousands of people\u2019s lives within the inundated area.", "riskManagementMeasures":"The U.S. Army Corps of Engineers (USACE) Fort Worth District continuously takes additional steps to reduce the risk to the public. This includes working closely with local emergency managers to encourage and support the development and update of local evacuation plans to maximize evacuation time and designated evacuation routes; regularly updating the Ray Roberts Dam Emergency Action Plan; and conducting emergency exercises with state and local response teams. In addition, USACE continues to identify and implement interim risk reduction measures, such as filling low spots across the top of the dam, clearing vegetation from the sides of the dam, conducting regular surveillance of the dam, and are currently considering automating instrumentation. USACE is currently reassessing risk at the spillway based on recommendation that a field investigation would increase confidence in the 2019 risk assessment results. Fort Worth District regularly inspects and monitors instruments that help ensure that the structure is performing as intended and help detect potential concerns. The frequency of these dam inspections increases when the lake level rises. Regular maintenance and repairs are performed as needed to keep the dam functioning properly.", "riverName":"ELM FORK OF THE TRINITY RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":100, "stateFedId":"TX08008", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":141, "submitDate":"2023-02-24T00:00:00.000Z", "surfaceArea":29350, "volume":18000000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1986, "congDist":"Congressional District 26, Texas", "city":"AUBREY", "county":"Denton", "aiannh":null, "websiteUrl":"https://www.swf-wc.usace.army.mil/rayroberts/", "coreTypeIds":"3", "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1;13", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1;13", "formerNames":"Aubry Dam", "foundationTypeIds":"1;3", "nonFederalDamOnFederalId":0, "designerNames":"CESWF", "otherNames":"Ray Roberts Lake", "ownerNames":"USACE - Fort Worth District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;4;5;8", "dsacId":3, "femaRegion":"6", "lastEapExcerDate":"2025-07-15T12:00:00.000Z", "dataUpdated":"2025-07-15T12:00:00.000Z", "usaceDistrict":"Fort Worth District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"120301", "doi_region":"ART", "doi_region_name":"Arkansas-Rio Grande-Texas Gulf", "doi_region_number":6, "thirtyYearAverage":939.0724, "tenthPercentile":767.7004, "ninetiethPercentile":1065.4341 }, "id":432048, "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/432048?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/432048?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/432048?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }