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"tsid":"New Hogan.Stor.Inst.0.Top of Flood", "latest_value":317100, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of gross pool", "label":"Top of Gross Pool", "parameter":"Stor", "base_parameter":"Stor", "tsid":"New Hogan.Stor.Inst.0.Top of Gross Pool", "latest_value":317100, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"New Hogan.Stor.Inst.0.Top of Inactive", "latest_value":14900, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of surcharge", "label":"Top of Surcharge", "parameter":"Stor", "base_parameter":"Stor", "tsid":"New Hogan.Stor.Inst.0.Top of Surcharge", "latest_value":348600, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549819, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":155, "damLength":1960, "distance":4, "drainageArea":363, "eapId":1, "dsacAssignedDate":"2008-12-01T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2025-06-04T12:00:00.000Z", "eapLastRevDate":"2023-02-22T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"CA10109", "oldFederalId":"CA10109", "hazardId":4, "hydraulicHeight":195, "inspectionAuthorityId":0, "inspectionDate":"2021-08-09T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":38.1510410590001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-120.813699019, "maxDischarge":106400, "maxStorage":348598, "nidHeight":210, "nidStorage":348598, "normalStorage":217410, "numberOfLocks":0, "operationalStatusDate":"2008-12-01T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) built and completed New Hogan Dam in 1963. The dam structure is primarily a rockfill embankment which also includes a gated concrete spillway located near the southern end of the main dam. The dam is located on the Calaveras river approximately 28 miles northeast of Stockton in Calaveras County, CA. The dam reduces the frequency of flooding in the city of Stockton, including other small communities, by holding back water during major flood events. In addition to reducing flooding downstream, the water held back by the dam forms New Hogan Lake. Although flood risk management is the project\u2019s primary focus, the dam is also authorized for municipal and industrial water supply, irrigation, hydropower generation, recreation, and environmental stewardship benefits.", "riskCharSummary":"New Hogan Dam has historically performed well and significantly reduces the risk of flooding to downstream communities. However, it does not fully eliminate the potential for downstream flooding. USACE completed a risk assessment for New Hogan Dam in 2006 to understand how the dam might perform during certain scenarios and found the likelihood of the dam overtopping or failing in those cases to be moderate. USACE identified two primary areas of dam safety concern regarding New Hogan Dam. During an extreme flood event, the water level of New Hogan Lake is estimated to rise to 3 feet below the top of the dam due to the lack of spillway adequacy; therefore, water could spill over the dam if there is a presence of strong waves. In addition, an unlikely major earthquake could cause the soil in the dam and under the dam\u2019s foundation to temporarily move like a liquid, which can result in significant deformations and strength loss of the dam. The resulting deformations and strength loss can disrupt materials inside the dam and potentially the buried upstream control chamber. This in turn could initiate water seeping through the dam materials, causing voids from internal erosion and uncontrolled loss of water from the reservoir. Should the dam breach during an extreme flood event where New Hogan Lake is at maximum capacity, the downstream communities will see significant flooding which could result in loss of human life, economic impacts, and environmental damage. The population at risk includes portions of the city of Stockton as well as rural areas in San Joaquin and Stanislaus counties. Potentially impacted infrastructure includes road networks, electrical substations, communication facilities, police and fire stations, hospitals, airports, and schools. Although these scenarios are considered extremely unlikely, there is an emergency action plan for New Hogan Dam to lower the risk of life loss if any of these scenarios occurred.", "riskManagementMeasures":"USACE works closely with local emergency managers, regularly updates the emergency action plan, and conducts emergency exercises with state, federal, and local partners, all of which help reduce risk to the public. USACE has full-time staff members who work at New Hogan Dam. The staff performs regular maintenance and repairs as needed to keep the dam functioning properly and are available 24/7 to perform immediate inspections if an unusual event occurs. USACE performs regular inspections and instrument monitoring to ensure that the structure is performing as designed and could help detect any areas of potential concern. The frequency of these checks increases when New Hogan Lake rises. USACE incorporates weather forecasts to make informed decisions on how to operate the dam. The releases at New Hogan Dam are determined using the knowledge of local flows in the system and there may be situations where these localized flows change quickly and could affect the downstream communities. In most scenarios, the downstream communities would have a coordinated warning notification within minutes to hours depending on location before water reaches their homes. However, during very large and rare earthquake events, there may be little to no warning.", "riverName":"CALAVERAS RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":114, "stateFedId":"CA10109", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":210, "submitDate":"2023-02-16T17:25:24.173Z", "surfaceArea":4400, "volume":0, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1963, "congDist":"Congressional District 05, California", "city":"JENNY LIND", "county":"Calaveras", "aiannh":null, "websiteUrl":"https://www.spk.usace.army.mil/Missions/Recreation/New-Hogan-Lake/", "coreTypeIds":"3", "damTypeIds":"5;8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":null, "nonFederalDamOnFederalId":0, "designerNames":null, "otherNames":"New Hogan Lake", "ownerNames":"USACE - Sacramento District", "ownerTypeIds":"3", "primaryDamTypeId":5, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;2;5;6", "dsacId":3, "femaRegion":"9", "lastEapExcerDate":"2025-04-23T12:00:00.000Z", "dataUpdated":"2025-06-04T12:00:00.000Z", "usaceDistrict":"Sacramento District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"180400", "doi_region":"CGB", "doi_region_name":"California-Great Basin", "doi_region_number":10 }, "id":3980992044, "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/3980992044?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/3980992044?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/3980992044?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }