{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -103.48881, 43.45417 ] }, "properties":{ "provider":"NWO", "code":"COLD", "slug":"cold", "elevation":null, "horizontal_datum":"WGS84", "vertical_datum":"LOCAL", "state":"SD", "kind":"PROJECT", "nearest_city":"Hot Springs", "public_name":"Cold Brook Dam & Reservoir", "location_code":2536030, "nsid":null, "aliases":{ "NIDID":"SD01097" }, "timeseries":[ { "tsid":"COLD.Flow-In.Ave.~1Day.1Day.Best-NWO", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow-In", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T05:00:00Z", "latest_value":1.19, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"COLD.Elev.Inst.1Hour.0.Best-NWO", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":3585.15, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"COLD.Stor.Inst.1Hour.0.Best-NWO", "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":696.0, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"COLD.Flow-Out.Inst.1Hour.0.Best-NWO", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Out", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":0.07, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"COLD.Stor.Inst.1Hour.0.Best-NWO", "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":696.0, "delta24h":null, "sort_order":11, "results":null } ], "name":"Cold Brook Dam & Reservoir", "hasResopsAverages":"false", "nidId":"SD01097", "nidid":"", "levels":[ { "slug":"elev.bottom of conservation", "label":"Bottom of 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"slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"COLD.Elev.Inst.0.Top of Conservation", "latest_value":3585, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"COLD.Elev.Inst.0.Top of Dam", "latest_value":3675, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"COLD.Elev.Inst.0.Top of Flood", "latest_value":3651.4, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of surcharge", "label":"Top of Surcharge", "parameter":"Elev", "base_parameter":"Elev", "tsid":"COLD.Elev.Inst.0.Top of Surcharge", "latest_value":3667.2, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of conservation", "label":"Bottom of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COLD.Stor.Inst.0.Bottom of Conservation", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.spillway crest", "label":"Spillway Crest", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COLD.Stor.Inst.0.Spillway Crest", "latest_value":6367, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COLD.Stor.Inst.0.Streambed", "latest_value":16, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COLD.Stor.Inst.0.Top of Conservation", "latest_value":520, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COLD.Stor.Inst.0.Top of Dam", "latest_value":13200, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COLD.Stor.Inst.0.Top of Flood", "latest_value":7231.2, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of surcharge", "label":"Top of Surcharge", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COLD.Stor.Inst.0.Top of Surcharge", "latest_value":10954.4, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549959, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":925, "distance":1, "drainageArea":71, "eapId":1, "dsacAssignedDate":"2017-05-25T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2023-09-26T12:00:00.000Z", "eapLastRevDate":"2009-09-01T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"SD01097", "oldFederalId":"SD01097", "hazardId":4, "hydraulicHeight":122, "inspectionAuthorityId":0, "inspectionDate":"2020-07-29T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":43.4534173490001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-103.489090426, "maxDischarge":80600, "maxStorage":7200, "nidHeight":130, "nidStorage":7200, "normalStorage":520, "numberOfLocks":0, "operationalStatusDate":"2017-05-25T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"Cold Brook Dam and Reservoir is owned, operated, and maintained by the U.S. Army Corps of Engineers (USACE). Completed in 1953, the project is one of two built by USACE in the Fall River basin to reduce risks from flooding in Hot Springs, S.D. (The second project is Cottonwood Springs.) When not operating the project to reduce flood impacts, water releases support recreation and fish and wildlife. Cold Brook Dam also provides water to Larive Lake.\n\nThe dam consists of an earthen embankment, an outlet structure to release stored water, and a spillway. During normal operations, the outlet structure releases water to downstream users and flows are generally less than 10 cubic feet per second (cfs) (one cubic foot of water is equal to 7.5 gallons). As operations shift to reducing flood risks during periods of high runoff and managing reservoir elevations, USACE can release up to 1,500 cfs from the outlet structure. When reservoir levels from extreme storms or snowmelt exceed the outlet structure\u2019s release capacity, water can flow through the spillway to reduce the likelihood of water flowing over the embankment (overtopping), which can lead to the dam\u2019s failure, or breach. The spillway was designed to release up to 80,600 cfs. This large but controlled, intentional flow is called a \u201cnon-breach\u201d release. The reservoir has never been high enough for spillway flow.\n\nFor perspective, the largest release of water from Cold Brook Dam as a result of flooding was approximately 19 cfs from the outlet structure in 1999. It is important to understand that the dam is designed to release far more water when necessary and these large releases can occur with minimal to no warning, even with warning systems in place.", "riskCharSummary":"Although Cold Brook Dam continues to reliably reduce floods, it alone cannot eliminate the risk of flooding (nor can Cottonwood Springs Dam). While unlikely, non-breach releases when the reservoir is full are critical to reducing the chance of dam overtopping, even if streams and rivers below the dam have reached or exceeded their capacity. Impacts on downstream populations and structures would be devastating, but overtopping could erode the embankment, leading to a breach, and allowing water stored behind the dam to flow uncontrolled downstream and further intensify downstream flooding.\n\nWhen USACE last assessed the dam\u2019s ability to meet flood risk management goals, it was determined that the primary threat that could lead to a dam breach during an extreme flood is overtopping of the embankment. Although this scenario is very unlikely, overtopping would cause catastrophic flooding with swift, deep, and life-threatening floodwaters in many parts of Hot Springs and communities along Fall River. This would substantially impact property, the economy, and critical infrastructure (such as power and water utilities, transportation systems, and commercial facilities). \n\nUSACE categorized the risk associated with Cold Brook Dam as \u201cmoderate\u201d among its more than 700 dams due to the downstream consequences in Hot Springs, SD. This database and the accompanying inundation maps provide additional details, including consequences, in the unlikely event of large releases of water or dam failure. For more information on the USACE Dam Safety Program and risk assessments, visit: https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program.", "riskManagementMeasures":"Ongoing Actions: Although dams do not eliminate flood risk, the USACE Dam Safety Program takes proactive steps to reduce risk to life, property, and the environment during both normal operations and extreme floods. Dam experts routinely monitor and observe the dam, conduct regular maintenance and repairs, and work closely with state and local emergency management agencies with responsibilities in communities potentially affected by high flows to improve preparedness, evacuation planning, and public awareness of flood risks. For more information visit: https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program.\n\nActions at Cold Brook Dam: While USACE continues to evaluate how to further reduce the risks associated with the dam, several interim measures are complete, including maintenance of instruments that monitor the structure\u2019s performance and vegetation management to ensure the outlet channel\u2019s flow capacity.\n\nBuilding Risk Awareness: Hot Springs and other downstream communities are encouraged to monitor National Weather Service flood forecasts during periods of heavy rain and snowmelt and learn about potential flood impacts to family, home, and community. It is important to understand community notification plans, including safe, efficient evacuation routes, and consider preparedness and emergency actions to reduce individual risks.", "riverName":"Cold Brook", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":200, "stateFedId":"SD01097", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":130, "submitDate":"2023-02-16T17:25:41.181Z", "surfaceArea":36, "volume":1072000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1953, "congDist":"Congressional District 00, South Dakota", "city":"Hot Springs", "county":"Fall River", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":"3", "damTypeIds":"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":"CENWO", "otherNames":"Cold Brook Lake", "ownerNames":"USACE - Omaha District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9", "dsacId":3, "femaRegion":"8", "lastEapExcerDate":"2020-02-05T12:00:00.000Z", "dataUpdated":"2025-07-03T12:00:00.000Z", "usaceDistrict":"Omaha District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"101201", "doi_region":"MB", "doi_region_name":"Missouri Basin", "doi_region_number":5 }, "id":2536030, "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/2536030?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/2536030?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/2536030?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }