{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -119.64108, 47.99511 ] }, "properties":{ "provider":"NWDP", "code":"CHJ", "slug":"chj", "elevation":null, "horizontal_datum":"NAD83", "vertical_datum":"", "state":"WA", "kind":"PROJECT", "nearest_city":"", "public_name":"Chief Joseph Dam", "location_code":47836029, "nsid":null, "aliases":{ "NIDID":"WA00299", "USGS Station Number":"12437990" }, "timeseries":[ { "tsid":"CHJ.Elev-Forebay.Ave.~1Day.1Day.CBT-REV", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev-Forebay", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T07:00:00Z", "latest_value":953.4, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"CHJ.Flow-Out.Ave.1Hour.1Hour.CBT-REV", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Out", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":95800.0, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"CHJ.Stor.Inst.~1Day.0.CBT-REV", "label":"Flood Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T07:00:00Z", "latest_value":569700.0, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"CHJ.Stor.Inst.~1Day.0.CBT-REV", "label":"Conservation Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T07:00:00Z", "latest_value":569700.0, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"CHJ.Flow-In.Ave.~1Day.1Day.CBT-REV", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow-In", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T07:00:00Z", "latest_value":107200.0, "delta24h":null, "sort_order":6, "results":null } ], "name":"Chief Joseph Dam", "hasResopsAverages":"false", "nidId":"WA00299", "nidid":"", "levels":[ { "slug":"elev.spillway crest", "label":"Spillway Crest", "parameter":"Elev-Forebay", "base_parameter":"Elev", "tsid":"CHJ.Elev-Forebay.Inst.1Day.Spillway Crest", "latest_value":901.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev-Forebay", "base_parameter":"Elev", "tsid":"CHJ.Elev-Forebay.Inst.1Day.Streambed", "latest_value":775, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev-Forebay", "base_parameter":"Elev", "tsid":"CHJ.Elev-Forebay.Inst.1Day.Top of Dam", "latest_value":970, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of normal", "label":"Top of Normal", "parameter":"Elev-Forebay", "base_parameter":"Elev", "tsid":"CHJ.Elev-Forebay.Inst.1Day.Top of Normal", "latest_value":956, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.bottom of flood", "label":"Bottom of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"CHJ.Elev.Inst.0.Bottom of Flood", "latest_value":956, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"CHJ.Elev.Inst.0.Top of Flood", "latest_value":958.8, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of flood", "label":"Bottom of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"CHJ.Stor.Inst.0.Bottom of Flood", "latest_value":593100, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"CHJ.Stor.Inst.0.Streambed", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"CHJ.Stor.Inst.0.Top of Flood", "latest_value":615220, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of normal", "label":"Top of Normal", "parameter":"Stor", "base_parameter":"Stor", "tsid":"CHJ.Stor.Inst.0.Top of Normal", "latest_value":1000, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549893, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":4300, "distance":1, "drainageArea":75400, "eapId":1, "dsacAssignedDate":"2018-07-11T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-11-01T12:00:00.000Z", "eapLastRevDate":"2024-11-22T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"WA00299", "oldFederalId":"WA00299", "hazardId":4, "hydraulicHeight":205, "inspectionAuthorityId":0, "inspectionDate":"2022-06-21T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":47.995359061, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-119.637427144, "maxDischarge":1200000, "maxStorage":593000, "nidHeight":230, "nidStorage":593000, "normalStorage":516000, "numberOfLocks":0, "operationalStatusDate":"2018-07-11T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) built Chief Joseph Dam in 1955. The dam is located on the Columbia River, near Bridgeport, Washington, approximately 545 miles above the river\u2019s mouth. The dam structure is primarily a concrete dam with earthen embankments on both abutments. Chief Joseph Dam is the second largest producer of hydropower in the US. Water stored by the project is also used for recreation and fish and wildlife conservation. Flood storage behind the project is minimal, and Chief Joseph Dam will typically pass whatever water Grand Coulee Dam (operated by Bureau of Reclamation) discharges. River flows are normally passed through the powerhouse to generate electricity, but a gated concrete spillway is also available to release excess flows during normal river operations and during extreme flood events.", "riskCharSummary":"USACE completed a risk assessment for Chief Joseph Dam in August 2018 to determine potential threats to the ability of USACE to meet the operational management goals of the dam. As a result, the project\u2019s risk is characterized as low. One unlikely failure scenario analyzed involved a rotational failure of one or more spillway monoliths occurring either during normal operating conditions or because of an earthquake, resulting in potentially deadly flooding in Bridgeport, Brewster, Pateros and other downstream communities. Although this failure scenario is considered extremely unlikely, USACE maintains a Chief Joseph Dam Emergency Action Plan to lower the risk of life loss and property damage if this or other failure scenarios occurred.\n\nUSACE is confident that the dam is solidly built, well-maintained, and will continue to perform as designed. However, the dam alone cannot eliminate flooding. Extreme snowmelt and rainfall events require USACE to release rising water through the dam\u2019s spillway to prevent overtopping and failure of the dam and to balance flood risk on the reservoir upstream. This can result in flooding areas downstream.", "riskManagementMeasures":"USACE is continuously taking significant steps to reduce risks to life safety and property, including enhanced monitoring and lifecycle maintenance. USACE conducts regular inspections and maintains a network of instruments to monitor the health of the dam. The frequency of inspections and instrumentation readings increases for unusual events to confirm whether the structure is performing as designed and identify areas of potential concern. Regular maintenance and repairs are performed as needed to keep the dam functioning properly. Rainfall and snowpack forecasts are continuously monitored to determine when high river flow events may occur to provide information for any necessary flood operations and associated warnings. USACE also works closely with local emergency managers to annually update the Emergency Action Plan, conducts periodic emergency exercises with state and local response teams, and annually hosts water control information stakeholder meetings.", "riverName":"COLUMBIA RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":980, "stateFedId":"WA00299", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":230, "submitDate":"2023-03-06T17:06:57.337Z", "surfaceArea":8400, "volume":1805707, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1955, "congDist":"Congressional District 04, Washington", "city":"BRIDGEPORT", "county":"Douglas", "aiannh":null, "websiteUrl":"https://www.nws.usace.army.mil/Missions/Civil-Works/Locks-and-Dams/Chief-Joseph-Dam/", "coreTypeIds":null, "damTypeIds":"9", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":null, "nonFederalDamOnFederalId":0, "designerNames":"CE", "otherNames":"Rufus Woods Lake", "ownerNames":"USACE - Seattle District", "ownerTypeIds":"3", "primaryDamTypeId":9, "primaryOwnerTypeId":3, "primaryPurposeId":6, "purposeIds":"6;5", "dsacId":4, "femaRegion":"10", "lastEapExcerDate":"2024-10-16T12:00:00.000Z", "dataUpdated":"2025-07-10T12:00:00.000Z", "usaceDistrict":"Seattle District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"170200", "doi_region":"CPN", "doi_region_name":"Columbia-Pacific Northwest", "doi_region_number":9 }, "id":47836029, "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/47836029?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/47836029?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/47836029?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }