{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -79.44537, 41.47544 ] }, "properties":{ "provider":"LRP", "code":"Tionesta", "slug":"tionesta", "elevation":0.0, "horizontal_datum":"WGS84", "vertical_datum":"NAVD88", "state":"PA", "kind":"PROJECT", "nearest_city":"Warren", "public_name":"Tionesta Lake", "location_code":16798111, "nsid":null, "aliases":{ "NIDID":"PA00110" }, "timeseries":[ { "tsid":"Tionesta-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":4.49, "delta24h":null, "sort_order":4, "results":null }, { "tsid":"Tionesta-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":954.99, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"Tionesta-Lake.Stor.Inst.1Hour.0.OBS", "label":"Flood Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T21:00:00Z", "latest_value":16544.49, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"Tionesta-Lake.Stor.Inst.1Hour.0.OBS", "label":"Conservation Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T21:00:00Z", "latest_value":16544.49, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"Tionesta-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":4.49, "delta24h":null, "sort_order":5, "results":null }, { "tsid":"Tionesta-Lake.Elev.Inst.1Hour.0.OBS", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T21:00:00Z", "latest_value":1100.88, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"Tionesta-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":1984.27, "delta24h":null, "sort_order":7, "results":null } ], "name":"Tionesta Lake", "hasResopsAverages":"false", "nidId":"PA00110", "nidid":"", "levels":[ { "slug":"elev.minimum", "label":"Minimum", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tionesta.Elev.Inst.0.Minimum", "latest_value":1084.57, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tionesta.Elev.Inst.0.Streambed", "latest_value":1042.7, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tionesta.Elev.Inst.0.Top of Conservation", "latest_value":1084.57, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tionesta.Elev.Inst.0.Top of Dam", "latest_value":1196.7, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tionesta.Elev.Inst.0.Top of Flood", "latest_value":1169.57, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of full", "label":"Top of Full", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tionesta.Elev.Inst.0.Top of Full", "latest_value":1169.57, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tionesta.Elev.Inst.0.Top of Inactive", "latest_value":1084.57, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.minimum", "label":"Minimum", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Tionesta.Stor.Inst.0.Minimum", "latest_value":6500, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Tionesta.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":"Tionesta.Stor.Inst.0.Top of Conservation", "latest_value":6500, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Tionesta.Stor.Inst.0.Top of Dam", "latest_value":219294, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Tionesta.Stor.Inst.0.Top of Flood", "latest_value":128735, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of full", "label":"Top of Full", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Tionesta.Stor.Inst.0.Top of Full", "latest_value":128735, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Tionesta.Stor.Inst.0.Top of Inactive", "latest_value":6500, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549992, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":1050, "distance":null, "drainageArea":478, "eapId":1, "dsacAssignedDate":"2019-10-11T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-10-25T12:00:00.000Z", "eapLastRevDate":"2017-05-05T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"PA00110", "oldFederalId":"PA00110", "hazardId":4, "hydraulicHeight":142, "inspectionAuthorityId":0, "inspectionDate":"2022-11-01T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":41.4754349090001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-79.4453828709999, "maxDischarge":103000, "maxStorage":180000, "nidHeight":154, "nidStorage":180000, "normalStorage":7800, "numberOfLocks":0, "operationalStatusDate":"2019-10-11T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) constructed Tionesta Dam from 1938 through 1941 across Tionesta Creek, which created Tionesta Lake. The primary purpose of Tionesta Dam is to hold back water during flood events to reduce the risk of downstream flooding on Tionesta Creek and the Allegheny River, including the towns of Tionesta, Oil City, and Franklin Pennsylvania. Since it went into operation, the dam has reduced damage caused by downstream flooding by more than an estimated $630 million. The reservoir also serves to enhance fish and wildlife and for recreation. The dam is composed of an earthen embankment that is 184 feet high and about 1,000 feet long. The reservoir levels are managed to approved levels throughout the year, normally by means of releases through a concrete tunnel that discharges water downstream to Tionesta Creek. To reduce the possibility that the reservoir will overtop the dam, there is an uncontrolled spillway beyond the embankment. In order to reduce the possibility that the reservoir will overtop the dam, a spillway (a concrete chute) was constructed beyond the right side of the dam to release a large volume of reservoir water away from the dam during significant rainfall events to reduce the possibility that water from the reservoir will overtop the dam.", "riskCharSummary":"The most recent risk assessment was completed in 2018, which characterized the risk posed by the dam as very low. The most likely flooding scenario is that high reservoir levels would result in flow through the spillway. The frequency and amount of water being released could be great enough to cause flooding in downstream communities with conditions similar to how the creek might behave if the dam did not exist. A less likely, but far more devastating flooding scenario exists: during an extreme rainfall event, high water levels in the reservoir could cause high water pressure within the embankment dam or its foundation. If this were to occur, the high-pressure water could erode the soils in the dam, which could lead to a breach of the dam. . \nIn either scenario, a large surge of water would flow out of the reservoir, flooding downstream communities. Tionesta Pennsylvania, located in the valley downstream of the dam, is in immediate danger in the event of a flood. Towns and cities further downstream, such as Oil City, Franklin, and Kittanning, Pennsylvania, have larger populations and less awareness of the dam, but will also have greater warning times, should a flood occur. In the event of breach, the downstream floodwater would be swift and deep, destroying buildings and key infrastructure, and those caught unaware and/or unable to evacuate could perish.", "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 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 Tionesta Lake is available to the public via the internet at: \n\nhttps://waterdata.usgs.gov/monitoring-location/03027000/#dataTypeId=continuous-62615-999411200&period=P7D&showMedian=true", "riverName":"TIONESTA CREEK", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":381, "stateFedId":"PA00110", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":154, "submitDate":"2023-02-16T17:25:33.519Z", "surfaceArea":480, "volume":1821600, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1940, "congDist":"Congressional District 15, Pennsylvania", "city":"TIONESTA", "county":"Forest", "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;3", "nonFederalDamOnFederalId":0, "designerNames":"CELRP", "otherNames":"Tionesta Lake", "ownerNames":"USACE - Pittsburgh District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;4;5", "dsacId":5, "femaRegion":"3", "lastEapExcerDate":"2025-05-01T12:00:00.000Z", "dataUpdated":"2025-06-23T12:00:00.000Z", "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":16798111, "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/16798111?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/16798111?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/16798111?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }