{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -80.03364, 39.31292 ] }, "properties":{ "provider":"LRP", "code":"Tygart", "slug":"tygart", "elevation":0.0, "horizontal_datum":"WGS84", "vertical_datum":"NAVD88", "state":"WV", "kind":"PROJECT", "nearest_city":"Fairmont", "public_name":"Tygart Lake", "location_code":17172111, "nsid":null, "aliases":{ "NIDID":"WV09101" }, "timeseries":[ { "tsid":"Tygart-Outflow.Stage.Inst.1Hour.0.OBS", "label":"Stage", "base_parameter":"Stage", "parameter":"Stage", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":5.4, "delta24h":null, "sort_order":4, "results":null }, { "tsid":"Tygart-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":0.0, "delta24h":null, "sort_order":16, "results":null }, { "tsid":"Tygart-Outflow.Stage.Inst.1Hour.0.OBS", "label":"Stage Tailwater", "base_parameter":"Stage", "parameter":"Stage", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":5.4, "delta24h":null, "sort_order":5, "results":null }, { "tsid":"Tygart-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":109313.46, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"Tygart-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":949.84, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"Tygart-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":1092.33, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"Tygart-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":109313.46, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"Tygart-Outflow.Flow.Inst.1Hour.0.OBS", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":566.0, "delta24h":null, "sort_order":7, "results":null } ], "name":"Tygart Lake", "hasResopsAverages":"false", "nidId":"WV09101", "nidid":"", "levels":[ { "slug":"elev.minimum", "label":"Minimum", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tygart.Elev.Inst.0.Minimum", "latest_value":1009.45, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tygart.Elev.Inst.0.Streambed", "latest_value":959.8, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tygart.Elev.Inst.0.Top of Conservation", "latest_value":1068.84, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tygart.Elev.Inst.0.Top of Dam", "latest_value":1194.05, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tygart.Elev.Inst.0.Top of Flood", "latest_value":1166.45, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of full", "label":"Top of Full", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tygart.Elev.Inst.0.Top of Full", "latest_value":1166.45, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Tygart.Elev.Inst.0.Top of Inactive", "latest_value":1009.45, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.minimum", "label":"Minimum", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Tygart.Stor.Inst.0.Minimum", "latest_value":11200, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Tygart.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":"Tygart.Stor.Inst.0.Top of Conservation", "latest_value":72655.78, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Tygart.Stor.Inst.0.Top of Dam", "latest_value":399889, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Tygart.Stor.Inst.0.Top of Flood", "latest_value":289600, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of full", "label":"Top of Full", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Tygart.Stor.Inst.0.Top of Full", "latest_value":289600, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Tygart.Stor.Inst.0.Top of Inactive", "latest_value":11200, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550047, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":1921, "distance":null, "drainageArea":1184, "eapId":1, "dsacAssignedDate":"2018-09-06T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-10-25T12:00:00.000Z", "eapLastRevDate":"2017-05-05T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"WV09101", "oldFederalId":"WV09101", "hazardId":4, "hydraulicHeight":234, "inspectionAuthorityId":0, "inspectionDate":"2023-04-26T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":39.313233419, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-80.033660431, "maxDischarge":316000, "maxStorage":355000, "nidHeight":234, "nidStorage":355000, "normalStorage":99900, "numberOfLocks":0, "operationalStatusDate":"2018-09-06T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) completed construction of Tygart Dam across the Tygart River in 1938 to hold back water during flood events to reduce the risk of downstream flooding in the low-lying communities in the Tygart and Monongahela River valleys, including Grafton, Colfax, Kingmont, Pleasant Valley, Fairmont, and Morgantown, West Virginia and Brownsville, Pennsylvania. The dam is located about two miles upstream of Grafton, West Virginia and forms the Tygart Lake. Tygart Dam has reduced flood damage by more than an estimated $1.3 billion since the start of operations. The reservoir stores rainfall to maintain downstream flow within the downstream riverbanks and releases water after flood events; provides water to the city of Grafton, West Virginia; and provides numerous opportunities for recreation. The Tygart Dam releases additional water downstream during the drier summer and fall months to meet navigation water supply requirements on the Monongahela and upper Ohio Rivers for commercial navigation. Tygart Dam is a concrete dam and has a maximum height of 234 feet and a length of 1921 feet. The dam has a 489-foot-long spillway, designed to release a large volume of water during significant rainfall events to reduce the possibility that water from the reservoir will overtop the dam.", "riskCharSummary":"The most recent risk assessment for the Tygart Dam was completed in 2017, which characterized the risk posed by the dam as very low. The dam was well-constructed and is well-maintained. However, large populations live downstream of Tygart Dam, including those in Grafton, Colfax, Kingmont, Pleasant Valley, Fairmont, and Morgantown, West Virginia; Brownsville, Pennsylvania; and other low-lying communities in the Tygart and Monongahela River valleys. Although the dam reduces the risk of flooding to these communities, it does not eliminate flooding. The most likely scenario resulting in downstream flooding from Tygart Dam would be a high-volume release over the dam\u2019s spillway (during an unusually large and intense storm event). The spillway has never experienced flow since the project was put into full operation in 1938. Water released over the spillway could create conditions similar to how the river would behave if the dam had not been constructed. \n\nThere is another unlikely, but far more devastating scenario that would produce significant flooding: drains in the foundation of the concrete dam could become plugged, increasing the pressure at the foundation of the dam, and leading to monolith movement during high pool conditions. \n\nIn either scenario, a large surge of water would flow out of the reservoir, flooding downstream communities. Communities, including Grafton, that are closer to the dam, are in more immediate danger of a significant flood event and may have little advanced warning. Cities and communities further downstream of the dam, such as Fairmont and Morgantown, have larger populations and possibly less awareness of the dam but will have more warning. \n\nWith either of the scenarios described above, the downstream floodwater would be swift and deep, possibly overflowing banks on the Tygart and Monongahela Rivers, destroying buildings and infrastructure. Anyone 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":"USACE will continue to work closely with state and local emergency managers, conduct emergency exercises and incorporate any new information into our emergency action plans. We will study whether there are additional measures that we can take to reduce the risk associated with high reservoir levels and uplift pressures resulting in monolith movement. We will continue rigorous monitoring and surveillance of the dam and will do so more frequently during high-water events. Rainfall forecasts and reservoir levels are routinely monitored and if a high-water event is forecast, we will promptly inform local and state emergency managers so that they can take protective actions, make flood warnings, and prepare for emergency responses. We will work with local communities to provide opportunities to engage with residents to help them understand how they can better prepare for a potential flood. In partnership with the U.S. Geologic Survey information on current lake levels at the Tygart reservoir is available to the public via the internet at: \n\nhttps://waterdata.usgs.gov/monitoring-location/03055500/#dataTypeId=continuous-00045-0&period=P7D&showMedian=true", "riverName":"TYGART RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":489, "stateFedId":"WV09101", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":234, "submitDate":"2023-02-16T17:25:31.128Z", "surfaceArea":1740, "volume":1380400, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1938, "congDist":"Congressional District 02, West Virginia", "city":"GRAFTON", "county":"Taylor", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":"2", "damTypeIds":"9", "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":"Tygart Lake", "ownerNames":"USACE - Pittsburgh District", "ownerTypeIds":"3", "primaryDamTypeId":9, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;3;4;5;8", "dsacId":5, "femaRegion":"3", "lastEapExcerDate":"2025-04-09T12:00:00.000Z", "dataUpdated":"2025-06-27T12:00:00.000Z", "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":17172111, "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/17172111?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/17172111?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/17172111?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }