{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -79.45137, 40.45681 ] }, "properties":{ "provider":"LRP", "code":"Loyalhanna", "slug":"loyalhanna", "elevation":0.0, "horizontal_datum":"WGS84", "vertical_datum":"NAVD88", "state":"PA", "kind":"PROJECT", "nearest_city":"Municipality of Murrysville", "public_name":"Loyalhanna Lake", "location_code":16696111, "nsid":null, "aliases":{ "NIDID":"PA00106" }, "timeseries":[ { "tsid":"Loyalhanna-Lake.Stor.Inst.1Hour.0.OBS", "label":"Conservation Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":2831.95, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"Loyalhanna-Lake.Precip-Inc.Total.1Hour.1Hour.OBS", "label":"Precipitation", "base_parameter":"Precip", "parameter":"Precip-Inc", "unit":"in", "unit_long_name":"Inches", "latest_time":"2026-04-14T22:00:00Z", "latest_value":0.25, "delta24h":null, "sort_order":16, "results":null }, { "tsid":"Loyalhanna-Outflow.Flow.Inst.1Hour.0.OBS", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T21:00:00Z", "latest_value":217.61, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"Loyalhanna-Outflow.Stage.Inst.1Hour.0.OBS", "label":"Stage", "base_parameter":"Stage", "parameter":"Stage", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T21:00:00Z", "latest_value":1.27, "delta24h":null, "sort_order":4, "results":null }, { "tsid":"Loyalhanna-Outflow.Stage.Inst.1Hour.0.OBS", "label":"Stage Tailwater", "base_parameter":"Stage", "parameter":"Stage", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T21:00:00Z", "latest_value":1.27, "delta24h":null, "sort_order":5, "results":null }, { "tsid":"Loyalhanna-Lake.Flow-Inflow-Comp.Inst.1Hour.0.A2W", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow-Inflow-Comp", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T18:00:00Z", "latest_value":385.94, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"Loyalhanna-Lake.Stor.Inst.1Hour.0.OBS", "label":"Flood Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":2831.95, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"Loyalhanna-Lake.Elev.Inst.1Hour.0.OBS", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":921.64, "delta24h":null, "sort_order":1, "results":null } ], "name":"Loyalhanna Lake", "hasResopsAverages":"false", "nidId":"PA00106", "nidid":"", "levels":[ { "slug":"elev.minimum", "label":"Minimum", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Loyalhanna.Elev.Inst.0.Minimum", "latest_value":909.52, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Loyalhanna.Elev.Inst.0.Streambed", "latest_value":868.4, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Loyalhanna.Elev.Inst.0.Top of Conservation", "latest_value":909.52, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Loyalhanna.Elev.Inst.0.Top of Dam", "latest_value":982.4, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Loyalhanna.Elev.Inst.0.Top of Flood", "latest_value":974.52, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of full", "label":"Top of Full", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Loyalhanna.Elev.Inst.0.Top of Full", "latest_value":974.52, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Loyalhanna.Elev.Inst.0.Top of Inactive", "latest_value":909.52, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.minimum", "label":"Minimum", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Loyalhanna.Stor.Inst.0.Minimum", "latest_value":550, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Loyalhanna.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":"Loyalhanna.Stor.Inst.0.Top of Conservation", "latest_value":550, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Loyalhanna.Stor.Inst.0.Top of Dam", "latest_value":117689, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Loyalhanna.Stor.Inst.0.Top of Flood", "latest_value":91330, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of full", "label":"Top of Full", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Loyalhanna.Stor.Inst.0.Top of Full", "latest_value":91330, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Loyalhanna.Stor.Inst.0.Top of Inactive", "latest_value":550, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550027, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":960, "distance":null, "drainageArea":290, "eapId":1, "dsacAssignedDate":"2016-11-07T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-10-25T12:00:00.000Z", "eapLastRevDate":null, "enforcementAuthorityId":0, "federalId":"PA00106", "oldFederalId":"PA00106", "hazardId":4, "hydraulicHeight":114, "inspectionAuthorityId":0, "inspectionDate":"2020-07-30T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":40.4568437900001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-79.451479681, "maxDischarge":106800, "maxStorage":127556, "nidHeight":120, "nidStorage":127556, "normalStorage":2000, "numberOfLocks":0, "operationalStatusDate":"2016-11-07T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) built Loyalhanna Dam in 1942 across the Loyalhanna Creek to hold water back during flood events to reduce the risk of downstream flooding on the Kiskiminetas, Allegheny and Ohio Rivers including metropolitan Pittsburgh. The dam is located on Loyalhanna Creek in Westmoreland County, Pennsylvania, approximately 5 miles upstream of Saltsburg and forms the Loyalhanna Creek Reservoir. Loyalhanna Dam has a maximum height of 120 feet. The dam is composed of a concrete gravity section that is 760 feet long, and an adjoining embankment section which extends the dam toward the left abutment, giving the dam a total length of 960 feet. The concrete portion of the dam contains five steel gates near the dam\u2019s crest. When the reservoir level rises to unusually high levels, these gates are opened to release water to the Kiskiminetas River to reduce the likelihood that the reservoir will overtop the dam. The reservoir stores rainfall to maintain downstream flow within the downstream river banks and releases water after flood events and provides numerous opportunities for recreation. Since it went into operation, the dam has reduced damage caused by downstream flooding by more than an estimated $650 million.", "riskCharSummary":"The most recent risk assessment for Loyalhanna Dam was completed in 2015, which characterized the risk as low. The most likely scenario that could result in downstream flooding from Loyalhanna Dam would be a high-volume release of water from the dam\u2019s spillway during an unusually large and intense rainfall event. The frequency and amount of water being released could be great enough to cause flooding in downstream communities. Such higher releases from the spillway could create conditions similar to how the river might behave if the dam had not been constructed.\n \nThere are three other less likely, but far more devastating scenarios that could occur during periods of extreme and prolonged rainfall events: 1. If the reservoir level rises above the top of the embankment portion of the dam, overflowing water could erode the embankment, leading to a breach. 2. High reservoir levels could cause high water pressure in the foundation of the dam, where the concrete dam meets the embankment dam; the high-pressure water could erode the embankment dam, leading to a breach. 3. If the reservoir level rises above the top of the dam, there is a possibility that a portion of the concrete dam could slide downstream, resulting in a breach. \n\nWith any of these scenarios, a large surge of water would flow out of the reservoir, flooding downstream communities. Saltsburg 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 Avonmore, Vandergrift 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 scenario, the water depth, property damage, and lives lost would likely 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 \ncontinue rigorous monitoring and surveillance of the dam and will do so more frequently 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 work with local communities to provide opportunities to engage with local residents to help them understand how they can better prepare for a flood. In partnership with the US Geologic Survey and the National Weather Service, information on current lake levels at Loyalhanna Creek Lake is available to the public via the internet at:\n\nhttps://waterdata.usgs.gov/monitoring-location/03046500/#dataTypeId=continuous-62615-0&period=P7D&showMedian=true", "riverName":"LOYALHANNA CREEK", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":150, "stateFedId":"PA00106", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":120, "submitDate":"2023-02-16T17:25:42.506Z", "surfaceArea":210, "volume":183000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1942, "congDist":"Congressional District 14, Pennsylvania", "city":"SALTSBURG", "county":"Westmoreland", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":"2", "damTypeIds":"9;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":"Loyalhanna Lake", "ownerNames":"USACE - Pittsburgh District", "ownerTypeIds":"3", "primaryDamTypeId":9, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;5", "dsacId":4, "femaRegion":"3", "lastEapExcerDate":"2025-04-11T12:00:00.000Z", "dataUpdated":"2025-05-29T12:00:00.000Z", "usaceDistrict":"Pittsburgh District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"050100", "doi_region":null, "doi_region_name":"North Atlantic-Appalachian", "doi_region_number":1 }, "id":16696111, "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/16696111?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/16696111?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/16696111?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }