{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -73.0908, 41.6814 ] }, "properties":{ "provider":"NAE", "code":"NBD", "slug":"nbd", "elevation":480.51, "horizontal_datum":"WGS84", "vertical_datum":"NGVD29", "state":"CT", "kind":"PROJECT", "nearest_city":"Bristol", "public_name":"Northfield Brook Dam", "location_code":8119021, "nsid":null, "aliases":{ "NIDID":"CT00505", "CWMS Legacy Naming":"NBD", "CWMS Standard Naming":"NBD" }, "timeseries":[ { "tsid":"NBD.Stage-Pool.Inst.15Minutes.0.DCP-rev", "label":"Stage Tailwater", "base_parameter":"Stage", "parameter":"Stage-Pool", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-08-25T21:30:00Z", "latest_value":22.49, "delta24h":null, "sort_order":5, "results":null }, { "tsid":"NBD.Stage-Pool.Inst.15Minutes.0.DCP-rev", "label":"Stage", "base_parameter":"Stage", "parameter":"Stage-Pool", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-08-25T21:30:00Z", "latest_value":22.49, "delta24h":null, "sort_order":4, "results":null }, { "tsid":"NBD.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":9.97, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"NBD.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":9.59, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"NBD.Stor.Ave.15Minutes.1Hour.DCP-rev", "label":"Flood Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-08-25T21:30:00Z", "latest_value":27.12, "delta24h":null, "sort_order":11, "results":null } ], "name":"Northfield Brook Dam", "hasResopsAverages":"false", "nidId":"CT00505", "nidid":"", "levels":[ { "slug":"stage.bottom of normal", "label":"Bottom of Normal", "parameter":"Stage-Pool", "base_parameter":"Stage", "tsid":"NBD.Stage-Pool.Inst.0.Bottom of Normal", "latest_value":0, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stage.streambed", "label":"Streambed", "parameter":"Stage-Pool", "base_parameter":"Stage", "tsid":"NBD.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":"NBD.Stage-Pool.Inst.0.Top of Dam", "latest_value":110.5, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stage.top of flood", "label":"Top of Flood", "parameter":"Stage-Pool", "base_parameter":"Stage", "tsid":"NBD.Stage-Pool.Inst.0.Top of Flood", "latest_value":95.5, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stage.top of normal", "label":"Top of Normal", "parameter":"Stage-Pool", "base_parameter":"Stage", "tsid":"NBD.Stage-Pool.Inst.0.Top of Normal", "latest_value":22.5, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stor.bottom of normal", "label":"Bottom of Normal", "parameter":"Stor", "base_parameter":"Stor", "tsid":"NBD.Stor.Inst.0.Bottom of Normal", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"NBD.Stor.Inst.0.Top of Flood", "latest_value":2350, "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":"NBD.Stor.Inst.0.Top of Normal", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" } ], "id":549849, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":111, "damLength":810, "distance":null, "drainageArea":6, "eapId":1, "dsacAssignedDate":"2021-12-02T12:00:00.000Z", "eapMeetsGuidelinesId":0, "emergencyContactsUpdated":"2024-12-20T12:00:00.000Z", "eapLastRevDate":"2013-07-01T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"CT00505", "oldFederalId":"CT00505", "hazardId":4, "hydraulicHeight":106, "inspectionAuthorityId":0, "inspectionDate":"2021-01-06T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":41.681602997, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-73.090461484, "maxDischarge":8800, "maxStorage":3200, "nidHeight":111, "nidStorage":3200, "normalStorage":80, "numberOfLocks":0, "operationalStatusDate":"2021-12-02T12:00:00.000Z", "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 Northfield Brook Dam reduces the risk of flooding to downstream communities, the dam does not eliminate the risk of flooding. Northfield Brook 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 Northfield Brook 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 and flood waters could be as deep as 13 feet. 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 2020 and classified the risks associated with the Northfield Brook Dam as low. There is uncertainty in the hydrologic loading on the dam that will be studied in the next risk assessment, which will be conducted in 2030 and will use evaluations that were completed for Thomaston Dam in 2023. Flooding would impact homes located along Northfield Road between the dam and Thomaston, Connecticut, which is the closest town. Major flooding would occur in Thomaston were the dam to breach. Flooding would also occur along the Naugatuck and its tributaries, including towns between Waterbury and Stratford, Connecticut. The unlikely, but more devastating scenarios that would produce significant downstream flooding is breach of the dam due to water flowing over the top of the dam. In the case of an extremely rare and large rain event, water could potentially flow over the top of the dam, which could cause erosion of the earthen embankment, and breach of the dam. In these scenarios, rapidly moving water could be as deep as 13 feet in Thomaston, 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\nNorthfield Brook Dam is operated in conjunction with Thomaston Dam and Black Rock Dam, and is staffed full time. During high pools, Hancock Brook Dam is inspected on a daily basis. When the pool continues to rise, engineers conduct a site visit to evaluate dam performance. Geotechnical instrumentation data is reviewed regularly during normal pools and more frequently during high pools.", "riverName":"NORTHFIELD BROOK", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":72, "stateFedId":"CT00505", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":111, "submitDate":"2023-02-16T17:25:23.667Z", "surfaceArea":7, "volume":646200, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1965, "congDist":"Congressional District 05, Connecticut", "city":"THOMASTON", "county":"Litchfield", "aiannh":null, "websiteUrl":"https://www.nae.usace.army.mil/Missions/Civil-Works/Flood-Risk-Management/Connecticut/Northfield-Brook/", "coreTypeIds":"3", "damTypeIds":"9;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":"CENAE", "otherNames":"Northfield Brook Lake", "ownerNames":"USACE - New England District", "ownerTypeIds":"3", "primaryDamTypeId":9, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;5", "dsacId":4, "femaRegion":"1", "lastEapExcerDate":"2025-01-27T12:00:00.000Z", "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":"011000", "doi_region":null, "doi_region_name":"North Atlantic-Appalachian", "doi_region_number":1 }, "id":8119021, "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/8119021?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/8119021?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/8119021?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }