{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -91.99362, 35.52103 ] }, "properties":{ "provider":"SWL", "code":"GreersFerry_Dam", "slug":"greersferry_dam", "elevation":0.0, "horizontal_datum":"WGS84", "vertical_datum":"NGVD29", "state":"AR", "kind":"PROJECT", "nearest_city":"Heber Springs", "public_name":"Greers Ferry Dam", "location_code":1946150, "nsid":null, "aliases":{ "CWMS Legacy Naming":"GreersFerry_Dam", "NWS Handbook 5 ID":"GRRA4", "NIDID":"AR00173", "NID Dam Name":"Greers Ferry Dam", "DCP Platform ID":"CE5CA926", "CWMS Standard Naming":"GreersFerry_Dam" }, "timeseries":[ { "tsid":"GreersFerry_Dam-Headwater.Elev.Inst.1Hour.0.Decodes-rev", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":456.0, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"GreersFerry_Dam-Headwater.%-Flood Pool.Inst.1Hour.0.CCP-Comp", "label":"Percent Flood Pool", "base_parameter":"%", "parameter":"%-Flood Pool", "unit":"%", "unit_long_name":"Percent", "latest_time":"2026-04-14T22:00:00Z", "latest_value":0.0, "delta24h":null, "sort_order":12, "results":null }, { "tsid":"GreersFerry_Dam.Precip-Cum.Inst.1Hour.0.Decodes-rev", "label":"Precipitation", "base_parameter":"Precip", "parameter":"Precip-Cum", "unit":"in", "unit_long_name":"Inches", "latest_time":"2026-04-14T22:00:00Z", "latest_value":19.61, "delta24h":null, "sort_order":16, "results":null }, { "tsid":"GreersFerry_Dam-Headwater.Stor-Res.Inst.1Hour.0.CCP-Comp", "label":"Conservation Storage", "base_parameter":"Stor", "parameter":"Stor-Res", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":1756999.95, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"GreersFerry_Dam.Flow-Tainter Total.Ave.1Hour.1Hour.Regi-Comp", "label":"Surcharge Release", "base_parameter":"Flow", "parameter":"Flow-Tainter Total", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":0.0, "delta24h":null, "sort_order":8, "results":null }, { "tsid":"GreersFerry_Dam-Headwater.%-Conservation Pool.Inst.1Hour.0.CCP-Comp", "label":"Percent Conservation Pool", "base_parameter":"%", "parameter":"%-Conservation Pool", "unit":"%", "unit_long_name":"Percent", "latest_time":"2026-04-14T22:00:00Z", "latest_value":75.14, "delta24h":null, "sort_order":14, "results":null }, { "tsid":"GreersFerry_Dam-Headwater.Stor-Res.Inst.1Hour.0.CCP-Comp", "label":"Flood Storage", "base_parameter":"Stor", "parameter":"Stor-Res", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":1756999.95, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"GreersFerry_Dam.Flow-Res Out.Ave.1Hour.1Hour.Regi-Comp", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Res Out", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":20.0, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"GreersFerry_Dam.Flow-Res In.Ave.1Hour.1Hour.6hr-RunAve-A2W", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow-Res In", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":0.0, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"GreersFerry_Dam-Tailwater.Elev-Downstream.Inst.1Hour.0.Decodes-rev", "label":"Elevation Tailwater", "base_parameter":"Elev", "parameter":"Elev-Downstream", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":266.67, "delta24h":null, "sort_order":3, "results":null } ], "name":"Greers Ferry Dam", "hasResopsAverages":"true", "nidId":"AR00173", "nidid":"", "levels":[ { "slug":"elev.bottom of normal", "label":"Bottom of Normal", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"GreersFerry_Dam.Elev-Pool.Inst.0.Bottom of Normal", "latest_value":435, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"GreersFerry_Dam.Elev-Pool.Inst.0.Streambed", "latest_value":260, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"GreersFerry_Dam.Elev-Pool.Inst.0.Top of Conservation", "latest_value":462.04, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"GreersFerry_Dam.Elev-Pool.Inst.0.Top of Dam", "latest_value":503, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"GreersFerry_Dam.Elev-Pool.Inst.0.Top of Flood", "latest_value":487, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev-Pool", "base_parameter":"Elev", "tsid":"GreersFerry_Dam.Elev-Pool.Inst.0.Top of Inactive", "latest_value":435, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of normal", "label":"Bottom of Normal", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"GreersFerry_Dam.Stor-Res.Inst.0.Bottom of Normal", "latest_value":1194000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"GreersFerry_Dam.Stor-Res.Inst.0.Top of Conservation", "latest_value":1943280, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"GreersFerry_Dam.Stor-Res.Inst.0.Top of Flood", "latest_value":2844500, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor-Res", "base_parameter":"Stor", "tsid":"GreersFerry_Dam.Stor-Res.Inst.0.Top of Inactive", "latest_value":1194000, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549768, "associatedStructuresCount":2, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":243, "damLength":1704, "distance":null, "drainageArea":1146, "eapId":1, "dsacAssignedDate":"2021-08-31T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-05-02T12:00:00.000Z", "eapLastRevDate":"2023-07-20T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"AR00173", "oldFederalId":"AR00173", "hazardId":4, "hydraulicHeight":243, "inspectionAuthorityId":0, "inspectionDate":"2024-11-21T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":35.5211832900001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-91.994231514, "maxDischarge":287000, "maxStorage":2844000, "nidHeight":251, "nidStorage":2844000, "normalStorage":1910000, "numberOfLocks":0, "operationalStatusDate":"2021-08-31T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) built Greers Ferry Dam between 1959 and 1962 to reduce the risk of flooding to downstream communities of Heber Springs, Clinton, Searcy, Bald Knob, and Judsonia. The dam is located on the Little Red River in Cleburne County, approximately three miles northeast of Heber Springs, Arkansas. Although reducing the impacts of flooding on downstream communities is the project\u2019s primary purpose, the storage of water in the reservoir behind the dam also provides water supply to nearby communities, recreation, state fishery operations, limited irrigation, and hydropower generation. \n\nGreers Ferry Dam is a concrete dam northeast of Heber Springs that includes a gated spillway that releases water downstream into the Little Red River. Additionally, two earthen embankments (or dikes) are located southwest of the concrete dam and contribute to retaining, or impounding, Greers Ferry Lake.", "riskCharSummary":"USACE completed a risk assessment for Greers Ferry Dam in August of 2020 that characterizes the risks associated with the project as high, which is USACE\u2019s second highest risk category. The dam significantly reduces the risk of flooding to surrounding communities. However, it does not entirely eliminate the risk. Although the Greers Ferry Dam has historically performed well, extreme rainfall and earthquake events may cause areas downstream to be flooded. Even when USACE operates the dam as intended, downstream flooding could still occur if a very large rainfall event were to require unusually large quantities of water to be released through the dam gates. In extreme cases, this flooding could be similar to what was experienced prior to the dam\u2019s construction. A less likely scenario would be if one of the gates were to have a problem during operation. In this case, more water than intended could be released, but that additional discharge would be limited to the amount that could pass through one gate. The most devastating potential scenario, but significantly less likely to happen, would occur if the dam were subjected to a large earthquake while the lake level was already high. In this unlikely event, an uncontrolled release of water could flow out of the reservoir, resulting in potentially deadly flooding of Heber Springs and Searcy, Arkansas, and other downstream communities. Greers Ferry Dam has an Emergency Action Plan to lower the risk of life loss if any of these scenarios occurred.", "riskManagementMeasures":"USACE performs ongoing inspection, maintenance, and monitoring activities to ensure the integrity of Greers Ferry Dam and to reduce risk to downstream communities. The frequency of inspection and monitoring increases during high water events. USACE regularly updates the Emergency Action Plan for the dam and performs emergency response exercises with federal, state, and local emergency managers to remain prepared to respond to flood events affecting the dam. USACE also closely follows rainfall forecasts to determine when high water events may occur to provide information for any necessary flood warnings.", "riverName":"LITTLE RED", "separateStructuresCount":2, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":240, "stateFedId":"AR00173", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":251, "submitDate":"2023-02-16T00:00:00.000Z", "surfaceArea":31460, "volume":856000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1962, "congDist":"Congressional District 02, Arkansas", "city":"Heber Springs", "county":"Cleburne", "aiannh":null, "websiteUrl":"https://www.swl.usace.army.mil/Missions/Recreation/Lakes/Greers-Ferry-Lake/", "coreTypeIds":"2", "damTypeIds":"11;9", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"1", "nonFederalDamOnFederalId":0, "designerNames":"CESWL, CESWL", "otherNames":"Greers Ferry Lake", "ownerNames":"USACE - Little Rock District", "ownerTypeIds":"3", "primaryDamTypeId":11, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;2;4;5;6;8", "dsacId":2, "femaRegion":"6", "lastEapExcerDate":"2024-07-17T12:00:00.000Z", "dataUpdated":"2025-07-02T12:00:00.000Z", "usaceDistrict":"Little Rock District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"110100", "doi_region":null, "doi_region_name":"Mississippi Basin", "doi_region_number":4, "thirtyYearAverage":2463.4252, "tenthPercentile":2309.3734, "ninetiethPercentile":2641.2014 }, "id":1946150, "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/1946150?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/1946150?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/1946150?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }