{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -95.5582, 38.65128 ] }, "properties":{ "provider":"NWK", "code":"POMA", "slug":"poma", "elevation":null, "horizontal_datum":"WGS84", "vertical_datum":"", "state":"KS", "kind":"PROJECT", "nearest_city":"Ottawa", "public_name":"Pomona Dam & Reservoir", "location_code":5663030, "nsid":null, "aliases":{ "NIDID":"KS00010", "USGS Station Number":"06912490" }, "timeseries":[ { "tsid":"POMA.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":15.0, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"POMA.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":1045.0, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"POMA.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":973.52, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"POMA.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":53636.72, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"POMA.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":53636.72, "delta24h":null, "sort_order":13, "results":null } ], "name":"Pomona Dam & Reservoir", "hasResopsAverages":"true", "nidId":"KS00010", "nidid":"", "levels":[ { "slug":"elev.bottom of conservation", "label":"Bottom of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"POMA.Elev.Inst.0.Bottom of Conservation", "latest_value":936, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.spillway crest", "label":"Spillway Crest", "parameter":"Elev", "base_parameter":"Elev", "tsid":"POMA.Elev.Inst.0.Spillway Crest", "latest_value":1006, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"POMA.Elev.Inst.0.Streambed", "latest_value":912, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"POMA.Elev.Inst.0.Top of Conservation", "latest_value":974, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"POMA.Elev.Inst.0.Top of Dam", "latest_value":1031, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"POMA.Elev.Inst.0.Top of Flood", "latest_value":1003, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of surcharge", "label":"Top of Surcharge", "parameter":"Elev", "base_parameter":"Elev", "tsid":"POMA.Elev.Inst.0.Top of Surcharge", "latest_value":1026, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of conservation", "label":"Bottom of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"POMA.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":"POMA.Stor.Inst.0.Spillway Crest", "latest_value":267359, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"POMA.Stor.Inst.0.Top of Conservation", "latest_value":55514, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"POMA.Stor.Inst.0.Top of Flood", "latest_value":239456, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of surcharge", "label":"Top of Surcharge", "parameter":"Stor", "base_parameter":"Stor", "tsid":"POMA.Stor.Inst.0.Top of Surcharge", "latest_value":525983, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550346, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":7750, "distance":null, "drainageArea":322, "eapId":1, "dsacAssignedDate":"2022-12-21T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-07-08T12:00:00.000Z", "eapLastRevDate":"2020-09-30T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"KS00010", "oldFederalId":"KS00010", "hazardId":4, "hydraulicHeight":111, "inspectionAuthorityId":0, "inspectionDate":"2022-03-11T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":38.650792928, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-95.558689775, "maxDischarge":50300, "maxStorage":254600, "nidHeight":111, "nidStorage":254600, "normalStorage":70600, "numberOfLocks":0, "operationalStatusDate":"2022-12-21T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) constructed Pomona Dam, completing in 1963. Pomona Dam is located on 110 Mile Creek, a tributary of the Marais des Cygnes River, approximately 8.5 miles west and 3 miles north of the town of Pomona Kansas. 23 miles downstream of the dam is the community of Ottawa, KS. The dam was authorized for flood control, water supply, water quality, recreation, and fish & wildlife enhancement. Pomona Dam has reduced flood damage by more than an estimated $707 million (2021 price level) from 1962 to 2020. The dam is 7,750 feet long composed of rolled impervious, pervious seepage collection, and berm zones. The top of the dam sits approximately 111 feet above the streambed.", "riskCharSummary":"USACE is confident that the dam is solidly built, well maintained, and will continue to significantly reduce flood risks. However, the dam alone cannot eliminate all flooding. Extreme rainfall events that exceed Pomona\u2019s storage capacity can cause the release of water down the uncontrolled spillway, even if the river is at or beyond capacity to prevent overtopping and failure of dam. This can result in flooding at downstream communities or can worsen already existing flooding if the rivers are over capacity. \n\nUSACE completed a risk assessment for Pomona Dam in March 2022 to determine the ability of USACE to meet the flood risk management goals of the dam. As a result, the project\u2019s risk is characterized as low. In an extreme flood scenario, inflows into the lake may exceed the storage and release capacity of the dam, and overtopping may occur. If overtopping occurs the earthen embankment of dam could erode leading to a sudden release of water downstream. This would result in extreme flooding downstream including affecting the community of Ottawa, KS.", "riskManagementMeasures":"USACE will continue to work closely with state and local emergency managers, conduct emergency exercises and incorporate any new information into our collective emergency action plans. We will continue rigorous monitoring and surveillance of the dam and will do so more frequently when heavy rainfall causes high lake levels. Rainfall forecasts and lake levels are routinely monitored and if a high lake level is forecasted, we will promptly inform local and state emergency managers so that they can take protective actions, make flood warnings, and prepare for emergency responses. We will work with communities that are developing downstream of the dam to help them understand how they can better prepare for a potential flood.", "riverName":"HUNDRED TEN MILE CREEK", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":200, "stateFedId":"KS00010", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":110, "submitDate":"2023-02-16T17:25:33.784Z", "surfaceArea":4000, "volume":5200000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1963, "congDist":"Congressional District 02, Kansas", "city":"OTTAWA", "county":"Osage", "aiannh":null, "websiteUrl":"https://www.nwk.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/", "coreTypeIds":"3", "damTypeIds":"5;8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"3", "nonFederalDamOnFederalId":0, "designerNames":"CENWK", "otherNames":"Pomona Lake", "ownerNames":"USACE - Kansas City District", "ownerTypeIds":"3", "primaryDamTypeId":5, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;4;5", "dsacId":4, "femaRegion":"7", "lastEapExcerDate":"2025-04-03T12:00:00.000Z", "dataUpdated":"2025-04-14T12:00:00.000Z", "usaceDistrict":"Kansas City District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"102901", "doi_region":"MB", "doi_region_name":"Missouri Basin", "doi_region_number":5, "thirtyYearAverage":80.8615, "tenthPercentile":62.7768, "ninetiethPercentile":102.8741 }, "id":5663030, "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/5663030?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/5663030?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/5663030?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }