{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -84.05389, 39.49028 ] }, "properties":{ "provider":"LRL", "code":"CaesarCreek", "slug":"caesarcreek", "elevation":846.0, "horizontal_datum":"NAD27", "vertical_datum":"NGVD29", "state":"OH", "kind":"PROJECT", "nearest_city":"Waynesville, OH", "public_name":"Caesar Creek Lake", "location_code":1064109, "nsid":null, "aliases":{ "NIDID":"OH00927" }, "timeseries":[ { "tsid":"CaesarCreek.Stor.Inst.1Hour.0.lrldlb-comp", "label":"Conservation Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T10:00:00Z", "latest_value":96469.78, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"CaesarCreek.Flow-Outflow.Inst.0.0.lrldlb-comp", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Outflow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T10:00:00Z", "latest_value":16.0, 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"units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"CaesarCreek.Stor.Inst.0.Top of Conservation", "latest_value":102000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"CaesarCreek.Stor.Inst.0.Top of Flood", "latest_value":242200, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of normal", "label":"Top of Normal", "parameter":"Stor", "base_parameter":"Stor", "tsid":"CaesarCreek.Stor.Inst.0.Top of Normal", "latest_value":93700, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of overflow", "label":"Top of Overflow", "parameter":"Stor", "base_parameter":"Stor", "tsid":"CaesarCreek.Stor.Inst.0.Top of Overflow", "latest_value":242200, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550165, "associatedStructuresCount":2, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":2650, "distance":13, "drainageArea":237, "eapId":1, "dsacAssignedDate":"2022-05-23T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2025-02-28T12:00:00.000Z", "eapLastRevDate":"2022-05-12T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"OH00927", "oldFederalId":"OH00927", "hazardId":4, "hydraulicHeight":168, "inspectionAuthorityId":0, "inspectionDate":"2024-08-06T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":39.484949993, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-84.061298557, "maxDischarge":91400, "maxStorage":242200, "nidHeight":180, "nidStorage":242200, "normalStorage":102000, "numberOfLocks":0, "operationalStatusDate":"2022-05-23T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) completed Caesar Creek Dam in 1975. Caesar Creek Dam is located approximately three miles above the mouth of Caesar Creek, a tributary to the Little Miami River, and approximately 30 miles northeast of Cincinnati, OH. The Caesar Creek Dam project consists of an earth and rock fill dam embankment, gated outlet works, and uncontrolled open cut spillway. The dam embankment is 2,650-foot-long with a maximum height of 165 feet. There are four earthen dikes upstream from the dam that prevent high reservoir pools from spilling over topographic low points. These dikes range from 600 feet to over a mile in length and 7 to 67 feet tall. Caesar Creek Dam reduces flooding along the Little Miami River and serves a drainage area of 237 square miles. The record pool EL. 870.73 feet NAVD88 \noccurred on January 19, 2005. The dam has never experienced a spillway flow event.", "riskCharSummary":"USACE completed a risk assessment for Caesar Creek Dam in 2020 that characterizes the risk of the project as a Dam Safety Action Classification (DSAC) 4 which is considered Low relative to the dams USACE owns and operates. The dam significantly reduces the risk of flooding to surrounding communities. However, it does not completely eliminate the risk. While Caesar Creek Dam has historically performed well, downstream flooding could still occur if a very large rainfall event were to require unusually large quantities of water to flow through the dam spillway. There is also an unlikely, but far more devastating scenario that would produce significant flooding, which is erosion of the dam's earthen embankment during a period of high reservoir levels that could lead to a breach of the dam. In this unlikely event, an uncontrolled surge of water could flow out of the reservoir, resulting in potentially deadly flooding along Caesar Creek and the Little Miami River.\n\nThe largest impacts would be to residents along the Little Miami River from the dam to its confluence with the Ohio River including the communities of South Lebanon, Loveland, and Milford, Ohio. There would also be backwater impacts and flooding North of the Caesar Creek and Little Miami River confluence impacting the communities of Waynesville and Corwin, Ohio. This upstream area would also be more immediately impacted should one of the Reservoir Dikes experience a failure.", "riskManagementMeasures":"USACE is continuously taking steps to reduce the risk to the public. This includes regularly updating the Emergency Action Plan and conducting emergency exercises with state and local emergency management agencies to ensure all key stakeholders understand their roles and responsibilities in the case of a dam related emergency. USACE utilizes the latest forecast, and stream gauge information and coordinates closely with the National Weather service concerning conditions both upstream and downstream of the dam including inflow, outflow, and precipitation. Rainfall forecasts are used to determine when high pool events may occur. USACE regularly inspects and monitors instruments to check the health of the dam. The frequency of these checks increases when the lake level rises. This ensures that the structure is performing as designed and could help detect any areas of potential concern. Regular maintenance and repairs are performed as needed to keep the dam functioning properly.", "riverName":"CAESAR CREEK", "separateStructuresCount":2, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":450, "stateFedId":"OH00927", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":180, "submitDate":"2023-12-06T14:41:15.310Z", "surfaceArea":2830, "volume":2343762, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1976, "congDist":"Congressional District 01, Ohio", "city":"OREGONIA", "county":"Warren", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":null, "damTypeIds":"5;8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":null, "nonFederalDamOnFederalId":0, "designerNames":null, "otherNames":"Caesar Creek Lake", "ownerNames":"USACE - Louisville District", "ownerTypeIds":"3", "primaryDamTypeId":5, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;5;8", "dsacId":4, "femaRegion":"5", "lastEapExcerDate":"2025-03-13T12:00:00.000Z", "dataUpdated":"2025-03-27T12:00:00.000Z", "usaceDistrict":"Louisville District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"050902", "doi_region":null, "doi_region_name":"Great Lakes", "doi_region_number":3, "thirtyYearAverage":124.1052, "tenthPercentile":119.824, "ninetiethPercentile":135.221 }, "id":1064109, "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/1064109?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/1064109?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/1064109?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }