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Operating", "latest_value":76.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of flood", "label":"Bottom of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"BON.Stor.Inst.0.Bottom of Flood", "latest_value":739000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.bottom of operating", "label":"Bottom of Operating", "parameter":"Stor", "base_parameter":"Stor", "tsid":"BON.Stor.Inst.0.Bottom of Operating", "latest_value":739000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"BON.Stor.Inst.0.Top of Flood", "latest_value":2471500, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of operating", "label":"Top of Operating", "parameter":"Stor", "base_parameter":"Stor", "tsid":"BON.Stor.Inst.0.Top of Operating", "latest_value":739000, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550256, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":56, "damLength":2477, "distance":null, "drainageArea":240000, "eapId":1, "dsacAssignedDate":"2024-04-16T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2025-06-03T12:00:00.000Z", "eapLastRevDate":"2008-08-25T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"OR00001", "oldFederalId":"OR00001", "hazardId":4, "hydraulicHeight":50, "inspectionAuthorityId":0, "inspectionDate":"2023-05-31T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":45.6442634410001, "lengthOfLocks":675, "secondaryLengthOfLocks":null, "longitude":-121.9408572309999, "maxDischarge":1600000, "maxStorage":537000, "nidHeight":197, "nidStorage":537000, "normalStorage":277000, "numberOfLocks":2, "operationalStatusDate":"2009-05-15T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"Bonneville Lock and Dam is located on the Columbia River between Washington and Oregon, 40 miles east of Portland, OR. The Bonneville Lock and Dam is owned and operated by the U.S. Army Corps of Engineers and consists of a central spillway, two powerhouses, two navigation locks, four fish ladders, recreational facilities, and visitor centers. It is an iconic project within the Columbia River gorge and has evolved its operations since completion in 1938.\n\nBonneville Lock and Dam is the furthest downstream dam in a river basin the size of France (240,000 square miles). Once a river with large fluctuations in flow throughout the year, the flow is now regulated by hundreds of dams and reservoir projects upstream on the mainstem Columbia River and tributaries in Washington, Idaho, Montana, and Canada. This system of dams is operated to balance many purposes, primarily the reduction of impacts from flooding during spring and summer months, and the provision of flows that support river navigation, irrigation, hydropower generation throughout the year, and fish and wildlife conservation. \n\nBonneville Lock and Dam is considered a run-of-river dam, operated to pass water and without the capacity to store large amounts of water behind the dam, compared to many larger dams further upstream. It is important to understand that while the project continues to operate reliably for its many purposes, it cannot eliminate the risk of flooding, nor can the system of dams in which it operates. \n\nThe hydropower production supported economic development and war efforts through the 1960s. Regional demand for increased hydropower production led to spillway modifications in the 1970s and construction of a second powerhouse in the 1980s. Since 1990, USACE has adjusted operations across the facility to improve passage for migratory fish. Due to its location just above sea level, Bonneville Lock and Dam is a vital link for migrating fish and inland river transportation. Learn more about the project here: https://www.nwp.usace.army.mil/bonneville.\n\nBonneville Lock and Dam is located about 100 miles east of the Cascadia Subduction Zone, a megathrust fault that parallels the Oregon Coast. This subduction zone is capable of producing very large, long duration earthquakes, the last of which occurred in 1700.", "riskCharSummary":"USACE performs risk assessments as part of its ongoing dam safety program to understand project risk and to help prioritize future investments in infrastructure improvements. The assessments evaluate the life safety, economic, and environmental risks associated with the dam\u2019s performance to determine if and what, risk reduction actions should be taken. In 2024, USACE completed an advanced risk assessment, called an Issue Evaluation Study, that concluded that risk at Bonneville is \u201cmoderate\u201d and driven by two possible but unlikely dam safety scenarios:\n \n1.\tAn extreme flood which overtops areas of the dam and results in uncontrolled releases. \n2.\tAn earthquake that affects the operability of the spillway or its associated components which results in overtopping areas of the dam and results in uncontrolled releases. \n\nThough unlikely, these scenarios could cause a dam breach in one or several locations, immediately or over time, resulting in uncontrolled downstream flow and potential loss of life, property damage, potential damage or overtopping of levees, economic, and environmental consequences. There is potential for the dam\u2019s structures to fail to operate in the short-term and not allow the river to flow. This could increase river elevations upstream of the dam and result in upstream impacts.\n\nUSACE now is evaluating future improvements to reduce risk to Bonneville\u2019s infrastructure should one of these scenarios arise.", "riskManagementMeasures":"USACE continues to conduct regular, routine inspections of its dams and Bonneville Lock and Dam is equipped with instrumentation to monitor dam performance and seismic activity. Post-earthquake procedures are in place to inspect and evaluate potential earthquake damages. With the completion of the IES, USACE is now evaluating specific actions to reduce the two most prominent risk scenarios. \n\nUSACE will conduct dam safety exercises with local Emergency Managers and first responders with responsibilities in potentially affected communities to improve preparedness, evacuation planning, and public awareness of Bonneville\u2019s infrastructure risks and flood risks. Bonneville Lock and Dam\u2019s Emergency Action Plan outlines actions to be taken during an emergency. USACE will update the plan based on the results of the Issue Evaluation Study and information from updated inundation maps. In addition, USACE will continue and increase its outreach to improve the region\u2019s awareness of Bonneville\u2019s infrastructure and flood risks.", "riverName":"COLUMBIA RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":1450, "stateFedId":"OR00001", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":197, "submitDate":"2023-02-16T17:25:10.752Z", "surfaceArea":20600, "volume":1168000, "widthOfLocks":85, "secondaryWidthOfLocks":null, "yearCompleted":1938, "congDist":"Congressional District 03, Oregon", "city":"BONNEVILLE", "county":"Multnomah", "aiannh":null, "websiteUrl":"https://www.nwp.usace.army.mil/bonneville/", "coreTypeIds":"2", "damTypeIds":"9", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"1", "nonFederalDamOnFederalId":0, "designerNames":"CENWP", "otherNames":"Lake Bonneville", "ownerNames":"USACE - Portland District", "ownerTypeIds":"3", "primaryDamTypeId":9, "primaryOwnerTypeId":3, "primaryPurposeId":3, "purposeIds":"3;12;5;6", "dsacId":3, "femaRegion":"10", "lastEapExcerDate":"2025-06-03T12:00:00.000Z", "dataUpdated":"2025-06-03T12:00:00.000Z", "usaceDistrict":"Portland District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"170800", "doi_region":"CPN", "doi_region_name":"Columbia-Pacific Northwest", "doi_region_number":9 }, "id":52381029, "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/52381029?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/52381029?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/52381029?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }