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Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"SMCT2.Elev.Inst.0.Top of Dam", "latest_value":974, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"SMCT2.Elev.Inst.0.Top of Flood", "latest_value":943, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev", "base_parameter":"Elev", "tsid":"SMCT2.Elev.Inst.0.Top of Inactive", "latest_value":775, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of inactive", "label":"Bottom of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"SMCT2.Stor.Inst.0.Bottom of Inactive", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.maximum tailwater", "label":"Maximum Tailwater", "parameter":"Stor", "base_parameter":"Stor", "tsid":"SMCT2.Stor.Inst.0.Maximum Tailwater", "latest_value":10069, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"SMCT2.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":"SMCT2.Stor.Inst.0.Top of Conservation", "latest_value":378852, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"SMCT2.Stor.Inst.0.Top of Flood", "latest_value":733517, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"SMCT2.Stor.Inst.0.Top of Inactive", "latest_value":71, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550017, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":224, "damLength":210, "distance":null, "drainageArea":1425, "eapId":1, "dsacAssignedDate":"2020-05-04T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-09-27T12:00:00.000Z", "eapLastRevDate":"2020-09-18T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"TX00004", "oldFederalId":"TX00004", "hazardId":4, "hydraulicHeight":219, "inspectionAuthorityId":0, "inspectionDate":"2023-02-02T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":29.8691730790001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-98.197621579, "maxDischarge":502800, "maxStorage":1208350, "nidHeight":224, "nidStorage":1208350, "normalStorage":378900, "numberOfLocks":0, "operationalStatusDate":"2020-05-04T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) built Canyon Lake Dam on the Guadalupe River in the early 1960\u2019s to reduce the risk of flooding to the downstream Texas cities of New Braunfels, Seguin, Gonzalez, Victoria, and adjacent towns and counties. Although flood risk management is the project\u2019s primary focus, the dam also provides significant water supply to nearby communities and offers unique recreational opportunities, along with fish and wildlife conservation and non- federal hydroelectric power generation. These benefits all significantly improve the quality of life in the area. Canyon Lake Dam is located 12 miles northwest of New Braunfels, Texas on the Guadalupe River. Canyon Lake Dam consists of an earthen embankment that holds water in the reservoir, gates that are operated to control water releases at the dam, and a spillway, which allows water to flow out when water levels within the reservoir become high. The main dam is made up of soil and rock and is 200 feet (or 20 stories) high near its center. Soil and rock dikes located south of the spillway and southwest of the dam near the Skyline Boat Ramp fill in low areas around the reservoir rim. Except for variations due to hydropower generation, water supply or flood storage, the reservoir is operated year-round as close to the top of the conservation (or normal) pool which is at a 909-foot elevation. When heavy rains occur, surface water runoff is 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 these streams and rivers may have already reached or exceeded their capacity.", "riskCharSummary":"Even though Canyon Lake Dam reduces the risk of flooding to the downstream communities, the dam does not eliminate the risk of flooding. USACE Fort Worth District completed a risk assessment for Canyon Lake Dam in May 2020 that characterizes the risk associated with the project as high, primarily due to the large populations living downstream that could be flooded under potential failure scenarios. The most likely scenario that could result in downstream flooding from Canyon Lake Dam would-be high-volume releases through the overflow spillway during significant storm events. Such high releases from the spillway could create conditions similar to how the river might behave if the dam did not exist. Although Canyon Lake Dam has historically performed well and safely passed the record 2002 flood event through the spillway, extreme rainfall events may result in up to an additional 25 feet of water over the spillway than what took place during the 2002 event. A spillway event of this magnitude would impact critical infrastructure downstream and has the potential to result in loss of life in communities such as New Braunfels and Seguin. The most devastating scenario, but significantly less likely to happen, would occur if the main dam or dikes were to be overtopped by stored water during an extreme flood event, in which case erosion of the embankment and breach of the dam could be possible. Should such a breach occur, significant depths of flooding up to four stories (approximately 40 feet) would be experienced down the Guadalupe River in New Braunfels and Seguin with lesser impacts further downstream. Although these communities have well-practiced emergency action plans and local emergency managers meet regularly with USACE to discuss emergency response to flood events, including the unlikely potential for dam failure, breach of the dam would result in significant loss of life and severe economic damages.", "riskManagementMeasures":"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 Canyon Lake 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 stockpiling materials to help lessen the potential for overtopping. USACE maintains road surfaces and turf on the dam to provide some erosion resistance should water flow over the dam. 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 and will be held weekly, daily, or hourly to assess flow and sediment transport if necessary. Critical operation procedures, hydraulic steel structure and periodic inspections, and periodic assessments are held on an annual, five year, and ten-year basis respectively. Regular maintenance and repairs are performed as needed to keep the dam functioning properly.", "riverName":"GUADALUPE RIVER", "separateStructuresCount":1, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":1260, "stateFedId":"TX00004", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":224, "submitDate":"2023-08-02T00:00:00.000Z", "surfaceArea":8308, "volume":11430050, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1964, "congDist":"Congressional District 21, Texas", "city":"NEW BRAUNFELS", "county":"Comal", "aiannh":null, "websiteUrl":"https://www.swf-wc.usace.army.mil/canyon/", "coreTypeIds":"3", "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1;13", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1;13", "formerNames":null, "foundationTypeIds":"1", "nonFederalDamOnFederalId":0, "designerNames":"CESWF", "otherNames":"Canyon Lake", "ownerNames":"USACE - Fort Worth District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;4;5;6;8", "dsacId":2, "femaRegion":"6", "lastEapExcerDate":"2025-01-15T12:00:00.000Z", "dataUpdated":"2025-06-30T12:00:00.000Z", "usaceDistrict":"Fort Worth District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"121002", "doi_region":"ART", "doi_region_name":"Arkansas-Rio Grande-Texas Gulf", "doi_region_number":6 }, "id":219048, "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/219048?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/219048?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/219048?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }