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"units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.bottom of inactive", "label":"Bottom of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"GPVT2.Stor.Inst.0.Bottom of Inactive", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.design capacity", "label":"Design Capacity", "parameter":"Stor", "base_parameter":"Stor", "tsid":"GPVT2.Stor.Inst.0.Design Capacity", "latest_value":788000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.spillway crest", "label":"Spillway Crest", "parameter":"Stor", "base_parameter":"Stor", "tsid":"GPVT2.Stor.Inst.0.Spillway Crest", "latest_value":425500, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"GPVT2.Stor.Inst.0.Streambed", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"GPVT2.Stor.Inst.0.Top of Conservation", "latest_value":163064, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"GPVT2.Stor.Inst.0.Top of Flood", "latest_value":406054, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"GPVT2.Stor.Inst.0.Top of Inactive", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550016, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":137, "damLength":12350, "distance":null, "drainageArea":688, "eapId":1, "dsacAssignedDate":"2019-09-21T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-10-01T12:00:00.000Z", "eapLastRevDate":"2020-10-02T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"TX00005", "oldFederalId":"TX00005", "hazardId":4, "hydraulicHeight":130, "inspectionAuthorityId":0, "inspectionDate":"2024-06-13T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":32.969859075, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-97.0562113569999, "maxDischarge":191310, "maxStorage":788000, "nidHeight":137, "nidStorage":788000, "normalStorage":181000, "numberOfLocks":0, "operationalStatusDate":"2019-09-21T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"Grapevine Dam was built by the U.S. Army Corps of Engineers (USACE) in 1952 to reduce the risk of downstream flooding to the Dallas/Fort Worth Metroplex area, as well as to store and supply water to the cities of Dallas and Grapevine. Since it went into operation, the dam has reduced damage caused by downstream flooding by an estimated $26.4 billion (adjusted to 2020 dollars). In addition, the Grapevine reservoir offers a wide range of outdoor recreational opportunities. Grapevine Dam consists of an earthen embankment that holds water in the reservoir, lifting gates that are operated to control water releases at the dam, and an ungated spillway which allows water to flow out when water levels within the reservoir exceed the available flood storage. Grapevine Dam is made up of rock and soil and has a maximum height of 135 feet. The ungated spillway is made of concrete and used as a safety measure to prevent lake levels from flowing over the top of the dam in extreme conditions. The top of the ungated spillway, or spillway crest, is approximately 20 feet lower than the tallest part of the dam and when the reservoir water level exceeds the dedicated flood storage levels the spillway can pass up to 1.4 million gallons of water per second, or enough water to flood a football field (not including the end zones) more than four feet deep every second. Except for variations due to water supply or flood storage, the reservoir is kept at a constant elevation year-round. Should heavy rains occur, surface water runoff is typically stored in the reservoir until the swollen streams and rivers below the dam recede and can handle the release of stored water without damage to lives, property or the environment. Sometimes water must be released to protect the dam\u2019s integrity even though streams and rivers may have already reached or exceeded their capacity.", "riskCharSummary":"Although Grapevine 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 Grapevine Dam is high volume releases through the outlet works and ungated 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. Grapevine 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 flood duration is long, lasting weeks or even months; however, it is possible that high peak and large volume floods could occur within a two-week duration. Despite the flood reduction benefits the dam provides, very rare, severe storms, much larger than have ever been experienced in the area, could still produce high surcharge releases with the potential to overtop downstream levees and 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. The risk assessment classified risks associated with Grapevine Dam as moderate. This classification is based on the potential for high life loss and consequences due to unlikely, but far more devastating scenarios than presented above that would produce significant flooding. The first scenario would be an extreme storm event, unlike anything ever experienced in this area, which would cause about a foot of water to flow over the top of the dam embankment. The water flowing over the top of the dam combined with the spillway discharge would result in flooding downstream that is 20 feet higher in some areas than the flooding experienced during the last major flood in 2015. Downstream flooding, due to water flowing over the dam, would impact communities from Grapevine to Dallas, TX. The same flood event would cause the water level in the lake to rise to 20 feet deeper than the highest recorded pool and localized flooding in the areas surrounding and adjacent to Lake Grapevine would occur prior to the reservoir flowing over the top of the embankment. There is a potential for breach of the dam at reservoir levels leading up to and over the top of the dam caused by water passing over the top of the dam causing erosion, or through the earthen embankment at the ends or under the dam and in the area where the embankment fill surrounds the concrete outlet pipe, creating voids as the soil erodes. In a breach scenario, downstream flood waters would be deep and move swiftly through the downstream cities located along the Trinity River in Tarrant, Denton, and Dallas Counties, including downtown Dallas, likely overflowing levees, and destroying billions of dollars of property. Flooded river depths immediately downstream of the dam could exceed the height of a four-story building. Additionally, some evacuation routes would be under water, increasing evacuation distances. Flood impacts could be expected along the Trinity River all the way to the Gulf of America. 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, breach of the dam would put thousands of people\u2019s lives at risk who are trapped 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. The USACE Emergency Action Plan for Grapevine Dam is updated and exercised annually, improving emergency response and coordination between USACE elements and downstream federal, state, county, city agencies, and stakeholders. USACE also communicates risks associated with Grapevine Dam annually with stakeholders and Emergency Managers. Inspections and monitoring are performed regularly to ensure the health and safety of the dam, and surveillance and inspections are increased as the lake elevation rises. Regular maintenance and repairs are performed as needed to keep the dam functioning properly. The performance of Grapevine Dam is also monitored by an automated instrumentation system, allowing USACE staff to evaluate the dam for changing conditions. In addition, USACE continues to identify and implement interim risk reduction measures such as clearing vegetation from the sides of the dam, conducting regular surveillance of the dam, assessing the current instrumentation program, managing utility encroachments, and stockpiling materials for emergency flood fighting. Risk management of Grapevine Dam is a priority for USACE at the national level which has led to higher level assessments in recent years. To understand the circumstances related to the concerns raised during a prior risk assessment, USACE conducted a more detailed analysis of the flood risks associated with the dam and incorporated the recommendations into the risk management measures discussed here.", "riverName":"DENTON CREEK", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":500, "stateFedId":"TX00005", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":137, "submitDate":"2023-02-24T00:00:00.000Z", "surfaceArea":7380, "volume":7070000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1952, "congDist":"Congressional District 24, Texas", "city":"CARROLLTON", "county":"Tarrant", "aiannh":null, "websiteUrl":"https://www.swf-wc.usace.army.mil/grapevine/", "coreTypeIds":"3", "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"3", "nonFederalDamOnFederalId":0, "designerNames":"CESWF", "otherNames":null, "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 }, "id":416048, "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/416048?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/416048?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/416048?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }