{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -72.77441, 43.12736 ] }, "properties":{ "provider":"NAE", "code":"BMD", "slug":"bmd", "elevation":805.51, "horizontal_datum":"", "vertical_datum":"NGVD29", "state":"VT", "kind":"PROJECT", "nearest_city":"Jamaica", "public_name":"Ball Mountain Dam", "location_code":8027021, "nsid":null, "aliases":{ "NIDID":"VT00001", "CWMS Legacy Naming":"BMD", "CWMS Standard Naming":"BMD", "USGS Station Number":"01155500" }, "timeseries":[ { "tsid":"BMD.Flow-Inflow.Total.15Minutes.6Hours.DCP-rev", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow-Inflow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-08-25T21:30:00Z", "latest_value":66.67, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"BMD.Stage-Pool.Inst.15Minutes.0.DCP-rev", "label":"Stage", "base_parameter":"Stage", "parameter":"Stage-Pool", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-08-25T22:00:00Z", "latest_value":67.51, "delta24h":null, "sort_order":4, "results":null }, { "tsid":"BMD.Flow.Inst.15Minutes.0.DCP-rev", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-08-25T21:30:00Z", "latest_value":53.41, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"BMD.Precip.Inst.15Minutes.0.DCP-rev", "label":"Precipitation", "base_parameter":"Precip", "parameter":"Precip", "unit":"in", "unit_long_name":"Inches", "latest_time":"2026-08-25T22:15:00Z", "latest_value":40.69, "delta24h":null, "sort_order":16, "results":null }, { "tsid":"BMD.Stor.Inst.15Minutes.0.DCP-rev", "label":"Flood Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-08-25T22:00:00Z", "latest_value":2235.94, "delta24h":null, "sort_order":11, "results":null } ], "name":"Ball Mountain Dam", "hasResopsAverages":"false", "nidId":"VT00001", "nidid":"", "levels":[ { "slug":"stage.bottom of normal", "label":"Bottom of Normal", "parameter":"Stage-Pool", "base_parameter":"Stage", "tsid":"BMD.Stage-Pool.Inst.0.Bottom of Normal", "latest_value":25, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stage.streambed", "label":"Streambed", "parameter":"Stage-Pool", "base_parameter":"Stage", "tsid":"BMD.Stage-Pool.Inst.0.Streambed", "latest_value":0, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stage.top of dam", "label":"Top of Dam", "parameter":"Stage-Pool", "base_parameter":"Stage", "tsid":"BMD.Stage-Pool.Inst.0.Top of Dam", "latest_value":246.5, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stage.top of flood", "label":"Top of Flood", "parameter":"Stage-Pool", "base_parameter":"Stage", "tsid":"BMD.Stage-Pool.Inst.0.Top of Flood", "latest_value":211.5, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stage.top of normal", "label":"Top of Normal", "parameter":"Stage-Pool", "base_parameter":"Stage", "tsid":"BMD.Stage-Pool.Inst.0.Top of Normal", "latest_value":65, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"BMD.Stor.Inst.0.Top of Flood", "latest_value":54450, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" }, { "slug":"stor.top of normal", "label":"Top of Normal", "parameter":"Stor", "base_parameter":"Stor", "tsid":"BMD.Stor.Inst.0.Top of Normal", "latest_value":2000, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" } ], "id":549885, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":247, "damLength":915, "distance":null, "drainageArea":172, "eapId":1, "dsacAssignedDate":"2017-10-27T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-12-20T12:00:00.000Z", "eapLastRevDate":"2021-03-29T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"VT00001", "oldFederalId":"VT00001", "hazardId":4, "hydraulicHeight":242, "inspectionAuthorityId":0, "inspectionDate":"2024-07-09T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":43.127673105, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-72.773870398, "maxDischarge":150000, "maxStorage":54700, "nidHeight":247, "nidStorage":54700, "normalStorage":2350, "numberOfLocks":0, "operationalStatusDate":"2017-10-27T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) operates and maintains more than 700 dams across the United States. A dam is an earthen embankment and/or solid concrete structure that is built across a river, stream, or other waterway to temporarily hold back and store water that would otherwise flow downstream. More detail related to this specific dam will be added at a future time.", "riskCharSummary":"Dams do not eliminate all risk of flooding. USACE works to address all types of flood risk associated with the dam. Dams have limited capacity to store water. Water may be released through the dam to manage water levels up or downstream or to relieve pressure on the dam to maintain its structural integrity. Severe weather events that bring inconsistent or larger amounts of water into the system can also lead to dam releases or in some cases overwhelm and lead to issues occurring at a dam. \n\nAlthough Ball Mountain Dam reduces the risk of flooding to downstream communities, the dam does not eliminate the risk of flooding. Ball Mountain Dam is designed to manage peak flooding levels downstream without risking the structural integrity of the dam. The most likely scenario that could result in downstream flooding is high volume releases from Ball Mountain Dam through the ungated spillway during high water events. This type of water release occurs when the reservoir's flood storage capacity is exceeded and excess water flows through the spillway. Water moving through the spillway during the largest expected flood in the watershed would put thousands of people at risk all along the Connecticut River down to Middleton, Connecticut. While weather can be unpredictable, this type of event can often be predicted 1-2 days before flood waters would impact downstream communities. USACE will engage state emergency managers when such an event is forecasted and support actions to get people to safety.\n\nUSACE completed a risk assessment in 2017 and classified the risks associated with the Ball Mountain Dam as low. Communities would be impacted all along the Connecticut River from Vermont to the Long Island Sound. The unlikely, but devastating scenario that would produce significant downstream flooding is erosion in the river channel soils leading to breach of the dam. This erosion could start and then continue though the the foundation soil, which could erode the placed embankment. Downstream flooding in Brattleboro would occur within an hour of breach and the rapidly moving water could be as deep as 61 feet, destroying buildings and critical infrastructure. In addition, some evacuation routes would be under water, increasing evacuation distances.", "riskManagementMeasures":"USACE manages dam-related flood risks by continually monitoring the condition and health of the dam, prioritizing activities that will most impact the risks, and engaging upstream and downstream emergency managers and members of the public to raise awareness of the dam and support actions to prepare and be ready to respond in the case of a dam-related emergency. USACE works closely with local emergency managers to share what is known about the dam and support the development of local emergency and evacuation plans. USACE regularly updates the emergency action plan for the dam. Regular maintenance and repairs are performed as needed to keep the dam functioning properly. \n\nBall Mountain Dam is operated in conjunction with Townshend Dam. Staff is shared between the two facilities, which are staffed full time. During high pools, Ball Mountain Dam is inspected on a daily basis. When the pool continues to rise, engineers conduct a site visit to evaluate dam performance. At very high levels, project staff stays on site for 24 hour watches. Geotechnical instrumentation data is reviewed regularly during normal pools and more frequently during high pools.", "riverName":"WEST", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":235, "stateFedId":"VT00001", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":247, "submitDate":"2023-06-05T14:32:33.534Z", "surfaceArea":800, "volume":0, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1961, "congDist":"Congressional District 00, Vermont", "city":"JAMAICA", "county":"Windham", "aiannh":null, "websiteUrl":"https://www.nae.usace.army.mil/Missions/Civil-Works/Flood-Risk-Management/Vermont/Ball-Mtn/", "coreTypeIds":"3", "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":null, "nonFederalDamOnFederalId":0, "designerNames":null, "otherNames":"Ball Mountain Lake", "ownerNames":"USACE - New England District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;6", "dsacId":4, "femaRegion":"1", "lastEapExcerDate":"2024-04-05T12:00:00.000Z", "dataUpdated":"2025-03-17T12:00:00.000Z", "usaceDistrict":"New England District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"010801", "doi_region":null, "doi_region_name":"North Atlantic-Appalachian", "doi_region_number":1 }, "id":8027021, "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/8027021?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/8027021?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/8027021?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }