{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -117.63611, 33.89028 ] }, "properties":{ "provider":"SPL", "code":"Prado", "slug":"prado", "elevation":470.0, "horizontal_datum":"WGS84", "vertical_datum":"NGVD29", "state":"CA", "kind":"PROJECT", "nearest_city":"Norco", "public_name":"Prado Dam", "location_code":777145, "nsid":null, "aliases":{ "NIDID":"CA10022" }, "timeseries":[ { "tsid":"Prado US.Flow.Ave.1Hour.1Hour.GOES-rev", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":165.67, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"Prado.Stor.Inst.1Hour.0.GOES-rev", "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":3298.55, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"Prado.Elev.Inst.1Hour.0.GOES-rev", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":491.05, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"Prado.Precip.Inst.1Hour.0.GOES-rev", "label":"Precipitation", "base_parameter":"Precip", "parameter":"Precip", "unit":"in", "unit_long_name":"Inches", "latest_time":"2026-04-14T22:00:00Z", "latest_value":14.3, "delta24h":null, "sort_order":16, "results":null }, { "tsid":"Prado.Flow.Inst.1Hour.0.GOES-rev", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":323.14, "delta24h":null, "sort_order":7, "results":null } ], "name":"Prado Dam", "hasResopsAverages":"false", "nidId":"CA10022", "nidid":"", "levels":[ { "slug":"elev.bottom of flood", "label":"Bottom of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Prado.Elev.Inst.0.Bottom of Flood", "latest_value":505, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Prado.Elev.Inst.0.Streambed", "latest_value":470, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of buffer pool", "label":"Top of Buffer Pool", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Prado.Elev.Inst.0.Top of Buffer Pool", "latest_value":505, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Prado.Elev.Inst.0.Top of Conservation", "latest_value":505, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Prado.Elev.Inst.0.Top of Dam", "latest_value":594.4, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of debris pool", "label":"Top of Debris Pool", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Prado.Elev.Inst.0.Top of Debris Pool", "latest_value":490, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Prado.Elev.Inst.0.Top of Flood", "latest_value":543, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of flood", "label":"Bottom of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Prado.Stor.Inst.0.Bottom of Flood", "latest_value":19469, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.bottom of flood control", "label":"Bottom of Flood Control", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Prado.Stor.Inst.0.Bottom of Flood Control", "latest_value":19469, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Prado.Stor.Inst.0.Streambed", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of buffer pool", "label":"Top of Buffer Pool", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Prado.Stor.Inst.0.Top of Buffer Pool", "latest_value":19469, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Prado.Stor.Inst.0.Top of Dam", "latest_value":771079, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of debris pool", "label":"Top of Debris Pool", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Prado.Stor.Inst.0.Top of Debris Pool", "latest_value":2500, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Prado.Stor.Inst.0.Top of Flood", "latest_value":174348, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549843, "associatedStructuresCount":4, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":106, "damLength":2280, "distance":null, "drainageArea":2255, "eapId":1, "dsacAssignedDate":"2020-03-12T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2025-04-22T12:00:00.000Z", "eapLastRevDate":"2020-05-31T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"CA10022", "oldFederalId":"CA10022", "hazardId":4, "hydraulicHeight":86, "inspectionAuthorityId":0, "inspectionDate":"2021-06-03T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":33.889999, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-117.642110665, "maxDischarge":181000, "maxStorage":295581, "nidHeight":106, "nidStorage":295581, "normalStorage":0, "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 completed construction of the Prado Dam in 1941 to provide flood risk management on the Santa Ana River. Additional authorized project purposes now include water conservation and recreation. The dam is located in San Bernardino County, California approximately 2 miles west of the City of Corona, and on the lower Santa Ana River approximately 30.5 miles upstream of the confluence with the Pacific Ocean. Prado Dam and Reservoir serve as the principal regulating structure on the Santa Ana River. The dam is comprised of an earth-filled embankment with a top of dam length of 2,280 feet and reaches of height above the streambed of 106 feet. The dam has two methods for releasing floodwaters: 1) an outlet structure in the west abutment consisting of an intake structure, two box conduits that run from the reservoir to downstream, and an outlet channel, 2) an uncontrolled spillway constructed through a bluff on the east abutment. The Prado Dam reduces the risk of flooding to more than 1.3 million people working in four counties and more than $80 billion in property. The reservoir is typically dry but has the capacity to store large volumes of water resulting in an estimated $207 million in annual flood damage reduction benefits.", "riskCharSummary":"The USACE conducted a dam safety risk assessment of Prado Dam in 2019 and classified the dam as high risk. The combination of life or economic consequences with the likelihood is high and USACE considers this level of life-risk to be unacceptable except in extraordinary circumstances. The assessment identified concerns with the performance of the spillway and the potential for flood waters to flow between the dam embankment and spillway during a major flood event. This could potentially result in dam failure, flooding several cities between the dam and ocean. The USACE is currently undertaking a study with planned modifications of Prado Dam to provide additional capacity for floodwater and sediment storage. Modifications to the dam embankment and outlet works were made in 2008, and other embankments, or dikes, have been and are currently being constructed throughout the reservoir. The USACE is working with a national team of experts to analyze the modifications to ensure risk is being decreased as low as reasonably practical.", "riskManagementMeasures":"To ensure USACE is taking all steps to reduce the risk to the public, USACE will continue to work closely with state and local emergency managers, conducting emergency exercises and incorporating any new information into our Emergency Action Plan. USACE closely follows rainfall forecasts to determine when high water events may occur to provide information for any necessary flood warnings. USACE is working with local communities to provide opportunities to engage with residents and schools to help them understand how they can better prepare for a flood. All dam safety staff are regularly trained to monitor and evaluate the condition of the dam based on key risk components. USACE regularly inspects and monitors instruments to check the health of the dam and increase this monitoring during 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":"SANTA ANA RIVER", "separateStructuresCount":2, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":1000, "stateFedId":"CA10022", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":null, "submitDate":"2023-02-16T17:25:42.463Z", "surfaceArea":1, "volume":0, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1941, "congDist":"Congressional District 40, California", "city":"ORANGE", "county":"Riverside", "aiannh":null, "websiteUrl":"https://www.spl.usace.army.mil/Missions/Asset-Management/Prado-Dam/", "coreTypeIds":null, "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":null, "nonFederalDamOnFederalId":0, "designerNames":"CESPL", "otherNames":"Prado Reservoir", "ownerNames":"USACE - Los Angeles District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;5;8", "dsacId":2, "femaRegion":"9", "lastEapExcerDate":"2023-07-18T12:00:00.000Z", "dataUpdated":"2025-04-23T12:00:00.000Z", "usaceDistrict":"Los Angeles District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"180702", "doi_region":"LCB", "doi_region_name":"Lower Colorado Basin", "doi_region_number":8 }, "id":777145, "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/777145?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/777145?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/777145?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }