{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -99.21185, 40.06975 ] }, "properties":{ "provider":"NWK", "code":"HACO", "slug":"haco", "elevation":null, "horizontal_datum":"WGS84", "vertical_datum":"", "state":"NE", "kind":"PROJECT", "nearest_city":"Kearney", "public_name":"Harlan County Dam & Reservoir", "location_code":5542030, "nsid":null, "aliases":{ "NIDID":"NE01066", "USGS Station Number":"06849000" }, "timeseries":[ { "tsid":"HACO.Flow-In.Ave.1Day.1Day.Best-NWK", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow-In", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T12:00:00Z", "latest_value":60.0, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"HACO.Stor.Inst.1Hour.0.Best-NWK", "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":212754.27, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"HACO.Elev.Inst.1Hour.0.Best-NWK", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":1937.34, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"HACO.Stor.Inst.1Hour.0.Best-NWK", "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":212754.27, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"HACO.Flow-Out.Ave.1Day.1Day.Best-NWK", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Out", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T12:00:00Z", "latest_value":0.0, "delta24h":null, "sort_order":7, "results":null } ], "name":"Harlan County Dam & Reservoir", "hasResopsAverages":"false", "nidId":"NE01066", "nidid":"", "levels":[ { "slug":"elev.bottom of conservation", "label":"Bottom of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"HACO.Elev.Inst.0.Bottom of Conservation", "latest_value":1894, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.spillway crest", "label":"Spillway Crest", "parameter":"Elev", "base_parameter":"Elev", "tsid":"HACO.Elev.Inst.0.Spillway Crest", "latest_value":1943.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"HACO.Elev.Inst.0.Streambed", "latest_value":1875, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"HACO.Elev.Inst.0.Top of Conservation", "latest_value":1945.73, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"HACO.Elev.Inst.0.Top of Dam", "latest_value":1982, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"HACO.Elev.Inst.0.Top of Flood", "latest_value":1973.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of surcharge", "label":"Top of Surcharge", "parameter":"Elev", "base_parameter":"Elev", "tsid":"HACO.Elev.Inst.0.Top of Surcharge", "latest_value":1975.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of conservation", "label":"Bottom of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"HACO.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":"HACO.Stor.Inst.0.Spillway Crest", "latest_value":285287, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"HACO.Stor.Inst.0.Top of Conservation", "latest_value":313715, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"HACO.Stor.Inst.0.Top of Flood", "latest_value":814111, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of surcharge", "label":"Top of Surcharge", "parameter":"Stor", "base_parameter":"Stor", "tsid":"HACO.Stor.Inst.0.Top of Surcharge", "latest_value":861878, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550178, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":107, "damLength":11827, "distance":null, "drainageArea":7636, "eapId":1, "dsacAssignedDate":"2022-11-11T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-11-12T12:00:00.000Z", "eapLastRevDate":"2020-09-30T12:00:00.000Z", "enforcementAuthorityId":1, "federalId":"NE01066", "oldFederalId":"NE01066", "hazardId":4, "hydraulicHeight":105, "inspectionAuthorityId":1, "inspectionDate":"2025-06-13T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":1, "latitude":40.0687618470001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-99.2112508069999, "maxDischarge":485000, "maxStorage":825700, "nidHeight":107, "nidStorage":825700, "normalStorage":327600, "numberOfLocks":0, "operationalStatusDate":"2022-11-11T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":1, "politicalPartyId":null, "privateDamId":null, "projectDescription":"Harlan County Dam is a high hazard dam located at river mile 239.4 on the Republican River in Harlan County, Nebraska, about 13 miles west of the town of Franklin, Nebraska. The dam consists of a zoned earthfill embankment and a concrete gravity type spillway control structure near the middle of the embankment. The rolled earthfill structure is 11,827 feet long and is 107 feet above the streambed. The embankment contains approximately 13,400,000 cubic yards of earthfill. The spillway control structure consists of a controlled overfall spillway and a stilling basin; it was constructed using approximately 430,000 cubic yards of concrete. The authorized project purposes include flood risk management, irrigation, recreation, and fish and wildlife habitat.", "riskCharSummary":"Risk at Harlan County Dam is driven by the potential for overtopping of the dam during an extreme flood event, the potential for sliding of the concrete dam section along the foundation, and the potential for embankment erosion at the interface between the earthen and concrete dam sections. Risk for Harlan County Dam is currently considered high. USACE will perform additional analysis to better understand the risks associated with the dam over the next several years.", "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. \nUSACE hosts tabletop exercises with local emergency managers and first responders every two years since the dam is considered high risk. USACE rehabilitated the spillway gates in 2018 to reduce the risk of a gate failure during operation. The sluice gates used to make normal releases from the dam were also rehabilitated in 2018. USACE is pursuing rehabilitation of the concrete spillway section of the dam, and investigating offsets in the concrete spillway sill below the dam.", "riverName":"REPUBLICAN", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":856, "stateFedId":"NE01066", "stateRegulatoryAgency":"NE DNR", "stateRegulatedId":1, "structuralHeight":107, "submitDate":"2023-02-16T17:25:38.984Z", "surfaceArea":13600, "volume":13400000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1952, "congDist":"Congressional District 03, Nebraska", "city":"NAPONEE", "county":"Harlan", "aiannh":null, "websiteUrl":"https://www.nwk.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/", "coreTypeIds":"3", "damTypeIds":"9;11;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":"CENWK", "otherNames":"Harlan County Lake", "ownerNames":"USACE - Kansas City District", "ownerTypeIds":"3", "primaryDamTypeId":9, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;2;4;5;8", "dsacId":2, "femaRegion":"7", "lastEapExcerDate":"2025-04-08T12:00:00.000Z", "dataUpdated":"2025-04-09T12:00:00.000Z", "usaceDistrict":"Kansas City District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"102500", "doi_region":"MB", "doi_region_name":"Missouri Basin", "doi_region_number":5 }, "id":5542030, "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/5542030?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/5542030?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/5542030?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }