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"conditionAssessDetail":null, "conditionAssessId":6, "damHeight":223, "damLength":0, "distance":null, "drainageArea":0, "eapId":1, "dsacAssignedDate":"2020-03-12T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-12-20T12:00:00.000Z", "eapLastRevDate":"2021-01-29T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"CT00506", "oldFederalId":"CT00506", "hazardId":4, "hydraulicHeight":218, "inspectionAuthorityId":0, "inspectionDate":"2023-11-07T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":42.006235539, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-73.0366342689999, "maxDischarge":0, "maxStorage":134000, "nidHeight":223, "nidStorage":134000, "normalStorage":47500, "numberOfLocks":0, "operationalStatusDate":"2020-03-12T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) built Colebrook River Dam in 1965 to 1968 across the West Branch Farmington River. The dam holds back water during flood events to reduce the risk of downstream flooding on the Farmington and Connecticut Rivers. The dam was built in response to the severe flooding that occurred in the region in 1955. Since it began operations, the dam has reduced damage caused by downstream flooding by more than $177 million. The Colebrook River Dam was also constructed to provide reservoir storage for water supply, hydropower, and fisheries conservation. The Metropolitan District of Connecticut (MDC) and USACE have an agreement to provide drinking water from the Colebrook River Dam reservoir. As of 2021 however, no water infrastructure has been constructed. In 2019, the Metropolitan District of Hartford, owner of the hydropower station at Colebrook River Dam, removed all hydroelectric equipment from the dam.\n\nThe dam is made of compacted earth fill with rock slope protection and is approximately 22 stories (223 feet) high. A 10-foot diameter rock cut tunnel called a conduit passes through the foundation rock beneath the dam. Metal gates at the upstream side of the conduit are opened to allow water to pass through the dam and are closed when water needs to be stored during flood events. To maintain the structural integrity of the dam when the water level in the reservoir gets high, water can also be released across the spillway, a sloped concrete structure located at the northeast end of the dam. A spillway is similar in concept to a sink overflow that prevents a sink bowl from completely overflowing. The spillway is 205 feet long and approximately three stories below the top of the dam. \n\nThe dam and its reservoir work in conjunction with a dike located half a mile southwest of the dam. The dike is typically not impounded with water, and only holds back water during flood events.", "riskCharSummary":"USACE completed a risk assessment of Colebrook River Dam in 2019 and has classified the risks associated with the dam as Moderate. This classification is based primarily on the large population living downstream of the dam that could experience catastrophic flooding in the very unlikely event of a failure of the dam. The dam significantly reduces the risk of flooding to surrounding communities. However, it does not entirely eliminate the risk. The most likely scenario that could result in downstream flooding from Colebrook River Dam would be an uncontrolled high volume release of water from the dam's spillway during significant storm events. The 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 during a flood event if the dam did not exist. \n\nThere is also an extremely unlikely, but far more devastating scenario that would result in failure of the dam and downstream flooding. A flood so large that the capacity of the dam to store water is exceeded, resulting in flows over the top of the dam, even with maximum possible releases being made through the conduit. If this event were to occur, an uncontrolled surge of water would flow out of the reservoir, flooding downstream communities. Riverton, Canton, and New Hartford, CT are the major areas in immediate danger in the event of the flood. Towns and cities further downstream, including Farmington, Hartford, Simsbury, and Windsor, CT would also be impacted, but less so. \n\nEven though very unlikely, if any of the scenarios described above were to occur, the downstream floodwater would be swift and deep, destroying buildings and key infrastructure, and those caught unawares 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 than flooding due to spillway discharges. In a worst case scenario, you could see a wave higher than a six story building.", "riskManagementMeasures":"No emergency situation currently exists at Colebrook River Dam. Should a crisis occur, we will use our expertise to quickly find a solution to resume operations. While we cannot completely eliminate risk, we are taking actions to further reduce the risks. We closely monitor the performance of Colebrook River Dam and will modify operations if we feel there is 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 for the dam. 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 so that necessary flood warnings may be issued in a timely manner. USACE will be undertaking additional study to further understand the risk associated with Colebrook River Dam, and what, if any, actions can be completed to reduce the risk.", "riverName":"WEST BRANCH FARMINGTON RIVER", "separateStructuresCount":1, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":0, "stateFedId":"CT00506", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":223, "submitDate":"2023-02-16T17:25:10.927Z", "surfaceArea":0, "volume":0, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1969, "congDist":"Congressional District 01, Connecticut", "city":"COLEBROOK", "county":"Litchfield", "aiannh":null, "websiteUrl":"https://www.nae.usace.army.mil/Missions/Civil-Works/Flood-Risk-Management/Connecticut/Colebrook/", "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", "nonFederalDamOnFederalId":0, "designerNames":"USACE", "otherNames":"Colebrook River Lake", "ownerNames":"USACE - New England District", "ownerTypeIds":"3", "primaryDamTypeId":9, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;5;6;8", "dsacId":3, "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":"010802", "doi_region":null, "doi_region_name":"North Atlantic-Appalachian", "doi_region_number":1, "thirtyYearAverage":28.3666, "tenthPercentile":16.3316, "ninetiethPercentile":42.9832 }, "id":8049021, "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/8049021?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/8049021?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/8049021?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }