{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -71.6603, 43.0933 ] }, "properties":{ "provider":"NAE", "code":"EVD", "slug":"evd", "elevation":325.0, "horizontal_datum":"WGS84", "vertical_datum":"", "state":"NH", "kind":"PROJECT", "nearest_city":"Concord", "public_name":"Everett Dam", "location_code":8062021, "nsid":null, "aliases":{ "NIDID":"NH00002", "CWMS Legacy Naming":"EVD", "CWMS Standard Naming":"EVD", "USGS Station Number":"01090800" }, "timeseries":[ { "tsid":"EVD.Precip.Inst.15Minutes.0.DCP-rev", "label":"Precipitation", "base_parameter":"Precip", "parameter":"Precip", "unit":"in", "unit_long_name":"Inches", "latest_time":"2026-08-25T22:00:00Z", "latest_value":25.84, "delta24h":null, "sort_order":16, "results":null }, { "tsid":"EVD.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":979.34, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"EVD.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":"2026-08-25T22:00:00Z", "latest_value":5.88, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"EVD.Stage-TAILWATER.Inst.15Minutes.0.DCP-rev", "label":"Stage Tailwater", "base_parameter":"Stage", "parameter":"Stage-TAILWATER", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-08-25T22:00:00Z", "latest_value":4.61, "delta24h":null, "sort_order":5, "results":null }, { "tsid":"EVD.Elev-Pool.Inst.15Minutes.0.DCP-rev", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev-Pool", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-08-25T22:00:00Z", "latest_value":339.69, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"EVD.Flow.Inst.15Minutes.0.DCP-rev", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-08-25T22:00:00Z", "latest_value":6.85, "delta24h":null, "sort_order":7, "results":null } ], "name":"Everett Dam", "hasResopsAverages":"false", "nidId":"NH00002", "nidid":"", "levels":[ { "slug":"elev.bottom of normal", "label":"Bottom of Normal", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"EVD.Elev-Pool.Inst.0.Bottom of Normal", "latest_value":325, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"EVD.Elev-Pool.Inst.0.Streambed", "latest_value":325, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"EVD.Elev-Pool.Inst.0.Top of Dam", "latest_value":435, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"EVD.Elev-Pool.Inst.0.Top of Flood", "latest_value":418, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.top of normal", "label":"Top of Normal", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"EVD.Elev-Pool.Inst.0.Top of Normal", "latest_value":340.5, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stor.bottom of normal", "label":"Bottom of Normal", "parameter":"Stor", "base_parameter":"Stor", "tsid":"EVD.Stor.Inst.0.Bottom of Normal", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"EVD.Stor.Inst.0.Streambed", "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":"EVD.Stor.Inst.0.Top of Flood", "latest_value":91500, "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":"EVD.Stor.Inst.0.Top of Normal", "latest_value":100, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" } ], "id":550186, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":110, "damLength":2000, "distance":null, "drainageArea":64, "eapId":1, "dsacAssignedDate":"2025-05-09T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-12-20T12:00:00.000Z", "eapLastRevDate":"2020-11-12T12:00:00.000Z", "enforcementAuthorityId":1, "federalId":"NH00002", "oldFederalId":"NH00002", "hazardId":4, "hydraulicHeight":115, "inspectionAuthorityId":1, "inspectionDate":"2021-11-08T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":1, "latitude":43.0930047470001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-71.659868515, "maxDischarge":28500, "maxStorage":131000, "nidHeight":115, "nidStorage":131000, "normalStorage":1000, "numberOfLocks":0, "operationalStatusDate":"2014-10-29T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":1, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) built Everett Dam from 1959 to 1962 across the Piscataquog River. The dam holds back water during flood events and works together with nearby Hopkinton Dam to reduce the risk of downstream flooding on the Merrimack River. Everett Dam normally holds a 15-foot deep, permanent pool that is used to enhance recreation at the project. The dam was built in response to the severe flooding that occurred in the region in 1936. Since it began operations through 2012, the dam reduced damage caused by downstream flooding by more than $79.5 million.\n\nThe dam is made of compacted earth and rock fill and is approximately 11 stories (110 feet) high. An 8-foot diameter concrete pipe called a conduit passes through 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 eastern 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 approximately half the length of a football field and approximately one and a half stories below the top of the dam. Two dikes, also composed of earth and rock fill, with approximate heights equivalent to 5 and 3 stories (50 and 30 feet) were constructed to close off low areas around the reservoir.", "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. More detail related to this specific dam will be added at a future time.", "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. More detail related to this specific dam will be added at a future time.", "riverName":"PISCATAQUQG RIVER", "separateStructuresCount":2, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":175, "stateFedId":"NH00002", "stateRegulatoryAgency":"NH DES", "stateRegulatedId":1, "structuralHeight":110, "submitDate":"2023-02-16T17:25:22.170Z", "surfaceArea":1, "volume":1771000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1961, "congDist":"Congressional District 02, New Hampshire", "city":"GOFFSTOWN", "county":"Hillsborough", "aiannh":null, "websiteUrl":"https://www.nae.usace.army.mil/Missions/Civil-Works/Flood-Risk-Management/New-Hampshire/Hop-Ev/", "coreTypeIds":"3", "damTypeIds":"5;8;9", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"1", "nonFederalDamOnFederalId":0, "designerNames":"CENAE", "otherNames":"Everett Lake", "ownerNames":"USACE - New England District", "ownerTypeIds":"3", "primaryDamTypeId":5, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;5", "dsacId":4, "femaRegion":"1", "lastEapExcerDate":"2024-09-05T12:00:00.000Z", "dataUpdated":"2025-05-13T12:00:00.000Z", "usaceDistrict":"New England District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"010700", "doi_region":null, "doi_region_name":"North Atlantic-Appalachian", "doi_region_number":1 }, "id":8062021, "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/8062021?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/8062021?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/8062021?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }