{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -90.2844, 36.9283 ] }, "properties":{ "provider":"MVS", "code":"Wappapello Lk", "slug":"wappapello%20lk", "elevation":347.74, "horizontal_datum":"WGS84", "vertical_datum":"NGVD29", "state":"MO", "kind":"PROJECT", "nearest_city":"Poplar Bluff", "public_name":"Wappapello Lake Project", "location_code":473018, "nsid":null, "aliases":{ "NIDID":"MO30204" }, "timeseries":[ { "tsid":"Wappapello Lk-St Francis.Flow-Out.Ave.~1Day.1Day.lakerep-rev", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Out", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-08-25T05:00:00Z", "latest_value":330.0, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"Wappapello Lk-St Francis.Stor.Inst.30Minutes.0.RatingCOE", "label":"Conservation Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-08-25T22:00:00Z", "latest_value":66182.77, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"Wappapello Lk-St Francis.Stor.Inst.30Minutes.0.RatingCOE", "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":66182.77, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"Wappapello Lk-St Francis.Flow-In.Ave.~1Day.1Day.lakerep-rev", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow-In", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-08-24T05:00:00Z", "latest_value":420.0, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"Wappapello Lk-St Francis.Stage.Inst.30Minutes.0.29", "label":"Stage", "base_parameter":"Stage", "parameter":"Stage", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-08-25T22:00:00Z", "latest_value":360.27, "delta24h":null, "sort_order":4, "results":null }, { "tsid":"Wappapello Lk-St Francis.Precip.Inst.30Minutes.0.lrgsShef-rev", "label":"Precipitation", "base_parameter":"Precip", "parameter":"Precip", "unit":"in", "unit_long_name":"Inches", "latest_time":"2026-08-25T22:00:00Z", "latest_value":24.67, "delta24h":null, "sort_order":16, "results":null } ], "name":"Wappapello Lake Project", "hasResopsAverages":"true", "nidId":"MO30204", "nidid":"", "levels":[ { "slug":"elev.bankfull", "label":"Bankfull", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Wappapello Lk.Elev.Inst.0.Bankfull", "latest_value":370, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.bottom of conservation", "label":"Bottom of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Wappapello Lk.Elev.Inst.0.Bottom of Conservation", "latest_value":338.74, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.bottom of flood", "label":"Bottom of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Wappapello 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"tsid":"Wappapello Lk.Elev.Inst.0.Seasonal Rule Curve", "latest_value":359.74, "units":"ft", "units_long_name":"Feet", "type":"REGULAR" }, { "slug":"elev.seasonal rule curve production", "label":"Seasonal Rule Curve Production", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Wappapello Lk.Elev.Inst.0.Seasonal Rule Curve Production", "latest_value":359.74, "units":"ft", "units_long_name":"Feet", "type":"REGULAR" }, { "slug":"elev.spillway crest", "label":"Spillway Crest", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Wappapello Lk.Elev.Inst.0.Spillway Crest", "latest_value":394.74, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Wappapello Lk.Elev.Inst.0.Streambed", "latest_value":319.74, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Wappapello Lk.Elev.Inst.0.Top of Conservation", "latest_value":354.74, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Wappapello Lk.Elev.Inst.0.Top of Dam", "latest_value":419.74, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Wappapello Lk.Elev.Inst.0.Top of Flood", "latest_value":394.74, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Wappapello Lk.Elev.Inst.0.Top of Inactive", "latest_value":338.24, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"elev.top of surcharge", "label":"Top of Surcharge", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Wappapello Lk.Elev.Inst.0.Top of Surcharge", "latest_value":413.74, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stage.fill", "label":"Fill", "parameter":"Stage", "base_parameter":"Stage", "tsid":"Wappapello Lk.Stage.Inst.0.Fill", "latest_value":0, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stage.flood", "label":"Flood", "parameter":"Stage", "base_parameter":"Stage", "tsid":"Wappapello Lk.Stage.Inst.0.Flood", "latest_value":909, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stage.record stage", "label":"Record Stage", "parameter":"Stage", "base_parameter":"Stage", "tsid":"Wappapello Lk.Stage.Inst.0.Record Stage", "latest_value":400.04, "units":"ft", "units_long_name":"Feet", "type":"CONSTANT" }, { "slug":"stor.bottom of conservation", "label":"Bottom of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Wappapello Lk.Stor.Inst.0.Bottom of Conservation", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" }, { "slug":"stor.bottom of flood", "label":"Bottom of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Wappapello Lk.Stor.Inst.0.Bottom of Flood", "latest_value":27577, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Wappapello Lk.Stor.Inst.0.Top of Conservation", "latest_value":27577, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Wappapello Lk.Stor.Inst.0.Top of Dam", "latest_value":1322810, "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":"Wappapello Lk.Stor.Inst.0.Top of Flood", "latest_value":611312, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" }, { "slug":"stor.top of surcharge", "label":"Top of Surcharge", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Wappapello Lk.Stor.Inst.0.Top of Surcharge", "latest_value":1134169, "units":"ac-ft", "units_long_name":"Acre-feet", "type":"CONSTANT" } ], "id":550143, "associatedStructuresCount":3, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":109, "damLength":2700, "distance":1, "drainageArea":1310, "eapId":1, "dsacAssignedDate":"2024-10-10T12:00:00.000Z", "eapMeetsGuidelinesId":0, "emergencyContactsUpdated":"2024-10-15T12:00:00.000Z", "eapLastRevDate":"2025-02-19T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"MO30204", "oldFederalId":"MO30204", "hazardId":4, "hydraulicHeight":103, "inspectionAuthorityId":0, "inspectionDate":"2022-04-28T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":36.931267679, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-90.280527756, "maxDischarge":200000, "maxStorage":1134600, "nidHeight":114, "nidStorage":1134600, "normalStorage":613200, "numberOfLocks":0, "operationalStatusDate":"2022-05-24T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) completed Wappapello Dam in 1941, and continues to own, operate, and maintain the facility today. Located across the St. Francis River, the dam helps control flooding to the downstream counties of Wayne, Stoddard, Dunklin, Butler, and New Madrid, MO. The project was originally constructed to provide flood control and has since been modified to include recreation, and conservation of fish and wildlife. The dam is located 16 miles northeast of Poplar Bluff, Missouri and less than one mile southwest of Wappapello, Missouri. The complete structure consists of an earth fill dam, gated outlet works, an auxiliary spillway, and three small saddle dikes in the rim near the left abutment.\nReservoir water is released into the St. Francis River through a concrete outlet works controlled by 3 slide gates. The dam\u2019s auxiliary spillway is located on its south side and is designed to pass high volumes of flood waters to prevent the dam from being overtopped and breaking. On rare occasions when the spillway is activated, the water passes over a concrete rim and slope into the spillway outlet channel and eventually back into the St. Francis River.", "riskCharSummary":"While Wappapello Dam greatly reduces flood risks downstream, it does not eliminate these risks. Flooding can still occur even if Wappapello Dam operates as designed. Unlikely but possible storm scenarios exist that could cause more rainfall than Wappapello Dam can safely store. To pass such a large amount of water, the outlet works gates may need to be fully opened and the dam\u2019s auxiliary spillway may activate to pass extreme flow events to keep Wappapello Dam from overtopping and breaking. \n\nWappapello Dam completed a Semi-Quantitative Risk Assessment (SQRA) in 2020 and an Issue Evaluation Study (IES) in 2021, confirming that the risks of failure associated with Wappapello Dam are considered moderate, which is in the middle of the five risk categories. The risk of Wappapello Dam is driven by performance related to seepage in the sand foundation under the dam during a flood event. Wappapello Dam is currently under-going a Dam Safety Modification Study (DSMS) to address these concerns. The DSMS is was completed in 2024 and is in the queue awaiting funding for construction.", "riskManagementMeasures":"USACE is continuously taking significant steps to reduce the risk to the public. This includes working closely with local emergency managers, regularly updating the Emergency Action Plan, and conducting emergency exercises with state and local response teams. USACE also regularly inspects the dam and routinely reassesses its risks. Interim risk reduction measures have also been implemented at Wappapello Dam that will minimize the exposure to risk while necessary long term remediation efforts are pursued. Wappapello Dam has recently gone through a Dam Safety Modification Study (DSMS). This study looked at a permanent, robust, and resilient design that will greatly reduce risks over the entirety of the project.\n\nDuring high-water events, USACE dam safety professionals increase surveillance of the dam as lake levels rise and are prepared to act if an issue occurs. USACE personnel also monitor river conditions to help optimize the dam\u2019s operations.", "riverName":"ST. FRANCIS RIVER", "separateStructuresCount":3, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":740, "stateFedId":"MO30204", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":114, "submitDate":"2023-06-26T15:57:33.864Z", "surfaceArea":23200, "volume":2710000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1941, "congDist":"Congressional District 08, Missouri", "city":"WAPPAPELLO", "county":"Wayne", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":"3", "damTypeIds":"8;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":"CEMVS", "otherNames":"Wappapello Lake", "ownerNames":"USACE - St. Louis District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;4;5", "dsacId":3, "femaRegion":"7", "lastEapExcerDate":"2023-11-02T12:00:00.000Z", "dataUpdated":"2025-03-12T12:00:00.000Z", "usaceDistrict":"St. Louis District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"080202", "doi_region":null, "doi_region_name":"Mississippi Basin", "doi_region_number":4, "thirtyYearAverage":126.9875, "tenthPercentile":110.6542, "ninetiethPercentile":135.6182 }, "id":473018, "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/473018?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/473018?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/473018?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }