{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -78.59389, 41.55884 ] }, "properties":{ "provider":"LRP", "code":"EastBranch", "slug":"eastbranch", "elevation":0.0, "horizontal_datum":"WGS84", "vertical_datum":"NAVD88", "state":"PA", "kind":"PROJECT", "nearest_city":"Olean", "public_name":"East Branch Clarion River Lake", "location_code":16634111, "nsid":null, "aliases":{ "NIDID":"PA00104" }, "timeseries":[ { "tsid":"EastBranch-Outflow.Flow.Inst.1Hour.0.OBS", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T20:00:00Z", "latest_value":22.96, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"EastBranch-Outflow.Stage.Inst.1Hour.0.OBS", "label":"Stage Tailwater", "base_parameter":"Stage", "parameter":"Stage", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T20:00:00Z", "latest_value":1.73, "delta24h":null, "sort_order":5, "results":null }, { "tsid":"EastBranch-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":60672.11, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"EastBranch-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":"2026-04-14T17:00:00Z", "latest_value":128.28, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"EastBranch-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":1665.69, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"EastBranch-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":60672.11, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"EastBranch-Outflow.Stage.Inst.1Hour.0.OBS", "label":"Stage", "base_parameter":"Stage", "parameter":"Stage", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T20:00:00Z", "latest_value":1.73, "delta24h":null, "sort_order":4, "results":null }, { "tsid":"EastBranch-Lake.Precip-Inc.Total.1Hour.1Hour.OBS", "label":"Precipitation", "base_parameter":"Precip", "parameter":"Precip-Inc", "unit":"in", "unit_long_name":"Inches", "latest_time":"2026-04-14T21:00:00Z", "latest_value":0.15, "delta24h":null, "sort_order":16, "results":null } ], "name":"East Branch Clarion River Lake", "hasResopsAverages":"false", "nidId":"PA00104", "nidid":"", "levels":[ { "slug":"elev.minimum", "label":"Minimum", "parameter":"Elev", "base_parameter":"Elev", "tsid":"EastBranch.Elev.Inst.0.Minimum", "latest_value":1554.78, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"EastBranch.Elev.Inst.0.Streambed", "latest_value":1522.7, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"EastBranch.Elev.Inst.0.Top of Conservation", "latest_value":1666.77, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"EastBranch.Elev.Inst.0.Top of Dam", "latest_value":1706.7, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"EastBranch.Elev.Inst.0.Top of Flood", "latest_value":1684.78, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of full", "label":"Top of Full", "parameter":"Elev", "base_parameter":"Elev", "tsid":"EastBranch.Elev.Inst.0.Top of Full", "latest_value":1684.78, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev", "base_parameter":"Elev", "tsid":"EastBranch.Elev.Inst.0.Top of Inactive", "latest_value":1554.78, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.minimum", "label":"Minimum", "parameter":"Stor", "base_parameter":"Stor", "tsid":"EastBranch.Stor.Inst.0.Minimum", "latest_value":1025, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"EastBranch.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":"EastBranch.Stor.Inst.0.Top of Conservation", "latest_value":61874.87, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"EastBranch.Stor.Inst.0.Top of Dam", "latest_value":119847, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"EastBranch.Stor.Inst.0.Top of Flood", "latest_value":84257, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of full", "label":"Top of Full", "parameter":"Stor", "base_parameter":"Stor", "tsid":"EastBranch.Stor.Inst.0.Top of Full", "latest_value":84257, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"EastBranch.Stor.Inst.0.Top of Inactive", "latest_value":1025, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550092, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":1725, "distance":null, "drainageArea":72, "eapId":1, "dsacAssignedDate":"2023-03-31T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-10-25T12:00:00.000Z", "eapLastRevDate":null, "enforcementAuthorityId":0, "federalId":"PA00104", "oldFederalId":"PA00104", "hazardId":4, "hydraulicHeight":173, "inspectionAuthorityId":0, "inspectionDate":"2022-04-29T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":41.5589204900001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-78.593743146, "maxDischarge":67200, "maxStorage":103000, "nidHeight":184, "nidStorage":103000, "normalStorage":65300, "numberOfLocks":0, "operationalStatusDate":"2023-03-31T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) constructed East Branch Dam from 1947 through 1952 across the East Branch of the Clarion River, which created East Branch Lake, whose primary purpose is to hold back water during flood events to reduce the risk of downstream flooding on the East Branch of the Clarion River and the Clarion River, including Johnsonburg and Ridgway, Pennsylvania. Since it went into operation, the dam has reduced damage caused by downstream flooding by more than an estimated $100 million. The reservoir also serves to store rainfall from late winter through early summer and release water to augment river flow during the drier late summer and early autumn months, provide water supply to downstream communities and hydropower generation along the Clarion River, and for recreational purposes. The dam is composed of an earthen embankment that is a maximum of 184 feet high and approximately 1700 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 to the downstream East Branch of the Clarion River. To reduce the possibility that the reservoir will overtop the dam, there is a concrete lined spillway at the left end of the embankment dam.", "riskCharSummary":"The most recent risk assessment was completed in 2022, which characterized the risk posed by the dam as very low. The most likely scenario resulting in downstream flooding from East Branch Dam would be a high-volume release over the dam\u2019s spillway (which has only occurred once occurred since the dam began operations in 1952) during an unusually large and intense storm 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 did not exist.\n\nA less likely, but far more devastating flooding scenario exists: during an extreme rainfall event, the reservoir level could rise above the top of the embankment dam, causing it to erode to the bottom of the valley and release the entire reservoir volume. \nIn either scenario, an uncontrolled surge of water would flow out of the reservoir, flooding downstream communities. Johnsonburg and Ridgway, located in the valley below the dam, are in more immediate danger in the event of a flood. Towns and cities further downstream have larger populations and less awareness of the dam, but will also have greater warning times, should a flood occur. With either of the scenarios described above, 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 the East Branch Lake is available to the public via the internet at: \n\nhttps://waterdata.usgs.gov/monitoring-location/03027000/#dataTypeId=continuous-00045-0&period=P7D&showMedian=true", "riverName":"CLARION RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":250, "stateFedId":"PA00104", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":184, "submitDate":"2023-03-01T12:22:43.360Z", "surfaceArea":1160, "volume":2826400, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1952, "congDist":"Congressional District 15, Pennsylvania", "city":"JOHNSONBURG", "county":"Elk", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":"2;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":"East Branch-Clarion River Lake", "ownerNames":"USACE - Pittsburgh District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;4;5", "dsacId":5, "femaRegion":"3", "lastEapExcerDate":"2024-12-17T12:00:00.000Z", "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":16634111, "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/16634111?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/16634111?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/16634111?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }