{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -118.4083, 34.30333 ] }, "properties":{ "provider":"SPL", "code":"Lopez", "slug":"lopez", "elevation":1272.0, "horizontal_datum":"WSG84", "vertical_datum":"NGVD29", "state":"CA", "kind":"PROJECT", "nearest_city":"San Fernando", "public_name":"Lopez Dam", "location_code":624145, "nsid":null, "aliases":{ "NIDID":"CA10020" }, "timeseries":[ { "tsid":"Lopez.Flow.Inst.0.0.Rescal", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-13T21:30:00Z", "latest_value":30.0, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"Lopez.Stor.Inst.0.0.Rescal", "label":"Flood Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-13T21:30:00Z", "latest_value":0.0, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"Lopez US.Flow.Ave.0.0.Rescal", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-13T21:30:00Z", "latest_value":30.0, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"Lopez.Elev.Inst.0.0.Rescal", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-13T21:30:00Z", "latest_value":1256.0, "delta24h":null, "sort_order":1, "results":null } ], "name":"Lopez Dam", "hasResopsAverages":"false", "nidId":"CA10020", "nidid":"", "levels":[ { "slug":"elev.bottom of flood", "label":"Bottom of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lopez.Elev.Inst.0.Bottom of Flood", "latest_value":1253.9, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.spillway", "label":"Spillway", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lopez.Elev.Inst.0.Spillway", "latest_value":1272.9, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lopez.Elev.Inst.0.Streambed", "latest_value":1253.9, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lopez.Elev.Inst.0.Top of Dam", "latest_value":1298.9, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lopez.Elev.Inst.0.Top of Flood", "latest_value":1298.9, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of flood", "label":"Bottom of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lopez.Stor.Inst.0.Bottom of Flood", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.spillway", "label":"Spillway", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lopez.Stor.Inst.0.Spillway", "latest_value":165, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lopez.Stor.Inst.0.Streambed", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lopez.Stor.Inst.0.Top of Dam", "latest_value":1606, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lopez.Stor.Inst.0.Top of Flood", "latest_value":1606, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549827, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":50, "damLength":1300, "distance":1, "drainageArea":34, "eapId":1, "dsacAssignedDate":"2009-11-19T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2025-04-22T12:00:00.000Z", "eapLastRevDate":"2020-05-28T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"CA10020", "oldFederalId":"CA10020", "hazardId":4, "hydraulicHeight":44, "inspectionAuthorityId":0, "inspectionDate":"2024-02-27T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":34.304010019, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-118.4103867109999, "maxDischarge":32000, "maxStorage":209, "nidHeight":50, "nidStorage":209, "normalStorage":0, "numberOfLocks":0, "operationalStatusDate":"2009-11-19T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"Lopez Dam is located on Pacoima Wash in the north central part of the San Fernando Valley, within the City and County of Los Angeles. The site is within an area known as Sylmar, a little over a mile north of the Interstate 210 (I-210) and California State Route 118 (SR-118) interchange. The US Army Corps of Engineers built the dam in 1954 to provide flood management of debris-laden floodwaters for the large area between the dam and the Los Angeles River. The reservoir has been filled with sediment releases from Pacoima Dam multiple time since construction and has been re-excavated each time. Lopez Dam consists of an earthen embankment with outlet works, a diversion structure, an unregulated spillway, and an outlet channel. The top of the dam length is approximately 1,330 feet long and is a maximum height of 45 feet above the original streambed. Flows from the spillway is diverted to channelized Pacoima Wash and navigate approximately 50 miles of channel between Lopez Dam to the Pacific Ocean.", "riskCharSummary":"In 2009, USACE conducted a risk assessment for Lopez Dam and the dam was classified as high risk. The combination of life or economic consequences with the likelihood of failure is high and USACE considers this level of life-risk to be unacceptable except in extraordinary circumstances. The assessment identified concerns due to the structural stability of the spillway and for the foundation of the dam. The primary impacted cities are Los Angeles and San Fernando, California. The downstream population at risk is highly urbanized and densely populated. In addition, significant economic consequences would be expected if a failure were to occur.", "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. Maintenance is performed on regular basis and repairs are performed as needed to keep the dam functioning properly. Future risk communication activities include updates to the Emergency Action Plan and coordinating these plans with first responders and development of a formal Risk Communication Plan. USACE will be conducting further study of the dam in 2023.", "riverName":"PACOIMA WASH", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":122, "stateFedId":"CA10020", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":null, "submitDate":"2023-02-16T17:25:25.036Z", "surfaceArea":1, "volume":0, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1954, "congDist":"Congressional District 29, California", "city":"LOS ANGELES", "county":"Los Angeles", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "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":"Lopez Reservoir", "ownerNames":"USACE - Los Angeles District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":7, "purposeIds":"7;9", "dsacId":2, "femaRegion":"9", "lastEapExcerDate":"2023-06-05T12:00:00.000Z", "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":"180701", "doi_region":"LCB", "doi_region_name":"Lower Colorado Basin", "doi_region_number":8 }, "id":624145, "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/624145?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/624145?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/624145?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }