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"conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":1610, "distance":null, "drainageArea":434, "eapId":1, "dsacAssignedDate":"2020-07-21T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-10-25T12:00:00.000Z", "eapLastRevDate":"2017-05-05T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"PA00109", "oldFederalId":"PA00109", "hazardId":4, "hydraulicHeight":177, "inspectionAuthorityId":0, "inspectionDate":"2020-11-03T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":39.798510741, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-79.369029737, "maxDischarge":130500, "maxStorage":300000, "nidHeight":184, "nidStorage":300000, "normalStorage":149300, "numberOfLocks":0, "operationalStatusDate":"2020-07-21T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) built Youghiogheny Dam in 1943 across the Youghiogheny River to hold back water during flood events to reduce the risk of downstream flooding on the Youghiogheny, Monongahela, and Ohio Rivers, including metropolitan Pittsburgh. Since it went into operation, the dam has reduced damage caused by downstream flooding by more than an estimated $600 million. The reservoir also serves to store rainfall from late winter through early summer to augment flow during the drier late summer and early autumn months, provide water supply to downstream communities, and can be used for recreational purposes.", "riskCharSummary":"Although Youghiogheny Dam reduces the risk of flooding to downstream communities, the dam does not eliminate the risk of flooding. The most recent risk assessment was completed in 2020, which characterized the risk posed by the dam as moderate. The most likely scenario that could result in downstream flooding from Youghiogheny Dam would be an uncontrolled high-volume release of water from the dam\u2019s spillway during significant storm events. The spillway is a concrete chute that automatically releases water to the Youghiogheny river downstream of the dam when the water level in the reservoir gets high to reduce the likelihood that water from the reservoir could overtop and erode the earthen dam. Water released from the spillway would cause flooding in downstream communities and create conditions similar to how the river would behave if the dam did not exist.\n\nThere are two much less likely, but far more devastating scenarios that would produce significant flooding: 1. erosion of the dam's soil foundation during a period of high reservoir levels could lead to a breach of the dam and 2. an extreme rainfall event could result in water flowing over the earthen dam, eroding the dam and leading to a breach. If either of these events were to occur, an uncontrolled surge of water would flow out of the reservoir, flooding downstream communities. Confluence, Ursina and adjacent communities located in the valley below the dam are in more immediate danger in the event of a flood. Towns and cities further downstream, including Ohiopyle, Connellsville, West Newton, and Pittsburgh have larger populations and less awareness of the dam, but will also have greater warning times, should a flood occur.\n \nIn any of the scenarios described above, the downstream floodwater would be swift and deep, overflowing levees, destroying buildings and key infrastructure, and those caught unaware and/or unable to evacuate could perish. In the less likely dam breach scenarios, the water depth, property damage, and lives lost would be far greater.", "riskManagementMeasures":"To ensure we are taking all steps to reduce the risk to the public, we will continue to work closely with state and local emergency managers, conducting emergency exercises, and incorporate any new information into our emergency action plan. We will also continue our rigorous monitoring and surveillance of the dam, especially during high water events. We closely follow rainfall forecasts to determine when high water events may occur to provide information for any necessary flood warnings. We are working with local communities to provide opportunities to engage with local residents to help them understand how they can better prepare for a flood.", "riverName":"YOUGHIOGHENY RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":344, "stateFedId":"PA00109", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":184, "submitDate":"2023-02-16T17:25:40.897Z", "surfaceArea":2840, "volume":3171600, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1944, "congDist":"Congressional District 14, Pennsylvania", "city":"CONFLUENCE", "county":"Fayette", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":"3", "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"1", "nonFederalDamOnFederalId":0, "designerNames":"CELRP", "otherNames":"Youghiogheny River Lake", "ownerNames":"USACE - Pittsburgh District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;4;5;6;8", "dsacId":3, "femaRegion":"3", "lastEapExcerDate":"2025-04-09T12:00:00.000Z", "dataUpdated":"2025-05-30T12:00:00.000Z", "usaceDistrict":"Pittsburgh District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"050200", "doi_region":null, "doi_region_name":"North Atlantic-Appalachian", "doi_region_number":1 }, "id":16525111, "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/16525111?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/16525111?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/16525111?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }