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Multi-Purpose", "parameter":"Stor", "base_parameter":"Stor", "tsid":"BLU.Stor.Inst.0.Top of Multi-Purpose", "latest_value":82800, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of operating", "label":"Top of Operating", "parameter":"Stor", "base_parameter":"Stor", "tsid":"BLU.Stor.Inst.0.Top of Operating", "latest_value":89500, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of secondary flood control", "label":"Top of Secondary Flood Control", "parameter":"Stor", "base_parameter":"Stor", "tsid":"BLU.Stor.Inst.0.Top of Secondary Flood Control", "latest_value":19260, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550109, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":270, "damLength":1250, "distance":null, "drainageArea":88, "eapId":1, "dsacAssignedDate":"2013-08-15T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2025-04-18T12:00:00.000Z", "eapLastRevDate":"2008-08-25T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"OR00013", "oldFederalId":"OR00013", "hazardId":4, "hydraulicHeight":265, "inspectionAuthorityId":0, "inspectionDate":"2021-08-26T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":44.1733297420001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-122.328309632, "maxDischarge":53200, "maxStorage":89000, "nidHeight":270, "nidStorage":89000, "normalStorage":83000, "numberOfLocks":0, "operationalStatusDate":"2013-08-15T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"Blue River Dam is located on the McKenzie River 1.5 miles upstream of Blue River, Oregon, and 41 miles upstream of Eugene and Springfield, Oregon. Blue River Dam is a 270-foot tall, 1,250-foot-long rockfill earthen embankment dam with a concrete spillway, two spillway gates, an intake structure with regulating outlet, and a 72-foot tall, 1,535-foot-long gravel earthen saddle dam. Blue River Dam is owned, operated, and maintained by the Portland District of the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1965 and was completed in 1968. The authorized purposes of the project are flood risk management, hydropower, recreation, irrigation, municipal and industrial water supply, fish and wildlife, navigation, and water quality. \n\nDuring the winter months, the Willamette Valley Project reservoirs are maintained at their lowest elevations to allow for the temporary storage of rain and snow melt. When managing high flow events, the outflow from the system of dams is coordinated to reduce peak flows and river stages at downstream locations. In spring, USACE begins to fill the reservoirs, increasing the amount stored for conservation purposes and reducing the amount of storage available for flood risk management. During summer, stored water is used for recreation on the reservoirs, and some stored water is released in the river downstream to improve water quality, support fish and wildlife habitat, and provide water for irrigation and municipal uses. During dry summer months, flows into the reservoirs are generally less than flows needed to meet minimum flow objectives, causing reservoir levels to drop. In fall, stored water remaining in the reservoir is drawn down to minimum levels in preparation for the flood season. Blue River Dam is downstream of Cougar Dam. \n\nBlue River Dam is located about 95 miles east of the Cascadia Subduction Zone, a megathrust fault along the Oregon Coast. The Cascadia Subduction Zone can produce very large, long duration earthquakes. The last Cascadia Subduction Zone earthquake occurred in the year 1700.", "riskCharSummary":"USACE has been conducting advanced risk assessments, called Issue Evaluation Studies (IES), at several Willamette Valley Project dams including Blue River Dam. The IES for Blue River Dam began in the spring of 2021 and is currently underway. As of June 2021, results of the advanced study for Blue River Dam identified the risk associated with the dam to be High. The risk is driven by two primary factors: the high population downstream combined with the potential for an extreme earthquake occurring at the same time reservoir elevations are the highest. Under these conditions, the main earthen dam and saddle dam could settle and crack, resulting in water overtopping and flowing through the dams. It is difficult to predict the exact amount of settlement and cracking that could occur due to such an earthquake. The speed and depth of water flowing over and through the damaged dams could erode the soil and rock that forms the dam and cause significant flooding downstream. The shaking from an extreme earthquake could also cause the concrete spillway to become damaged. If this occurs when the reservoir is at its highest, the cracked and damaged spillway may no longer be able to hold back water. The study also determined that an extreme and unlikely rainfall event could cause significant downstream flooding by overtopping the dam. Fallen trees, woody debris, and rockfall debris in the reservoir could partially block the spillway gates during an extreme and unlikely rainfall event. The partial blockage of the spillway gates from the debris could reduce or prevent passage of flow through the dam, which would cause the reservoir to rise above and flow over the top of the embankment dam. As water flows over the top of the dam, the speed and depth of the water could erode the soil and rock that forms the dam. Because Blue River Dam is located upstream of Eugene and Springfield, Oregon, there is potential for devastating flooding to affect large downstream populations in urban areas and surrounding suburbs, as well as rural communities in the floodplain and narrow canyons. \n\nUSACE performs risk assessments as part of an ongoing dam safety program and to assist in the prioritization of investment for aging infrastructure. The risk assessments evaluate the life safety risks associated with the dams to determine if risk reduction actions are needed and, if so, what actions should be taken. The assessment considers a wide range of hazard scenarios from the most likely to the most extreme and unlikely.\n\nUSACE is confident that the Willamette Valley dams are well-built, well-maintained, and will continue to significantly reduce flood risks for the region. However, the dams cannot eliminate potential for flooding. Even with the presence of the Willamette Valley dams, extreme rainfall and snowmelt events may result in flooding in areas downstream of dams. Flooding can be caused by high flows resulting from unregulated portions of the watershed and/or high flow that must be passed through the dam outlets and spillways when reservoir storage capacities are exceeded.", "riskManagementMeasures":"USACE will continue to evaluate the seismic performance of the embankments and the spillway as part of the IES to determine if immediate short-term measures or long-term modifications will be necessary. The IES work will include sampling and testing of the earthen embankment materials and advanced computer modeling of the earthen and concrete structures that will simulate the response to earthquake shaking. USACE is also working to remove fire-damaged trees and rockfall from the September 2020 wildfire that devastated much of the McKenzie River Valley. Removal of this material from around the reservoir and spillway channel will reduce the likelihood of reduced flow capacity through the spillway. USACE regularly conducts routine inspections of its dams and Blue River Dam is equipped with instrumentation to monitor dam performance and seismic activity. Post-earthquake procedures are in place to inspect and evaluate earthquake damages and USACE conducts routine dam safety exercises with local Emergency Managers and first responders. Blue River Dam\u2019s Emergency Action Plan (EAP) outlines actions to be taken during an emergency. USACE will update the EAP based on the ongoing risk assessment results and information from updated inundation maps. In addition, USACE will continue and increase its outreach to improve community awareness of flood risks and risks associated with the dam", "riverName":"BLUE RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":70, "stateFedId":"OR00013", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":270, "submitDate":"2023-08-03T03:35:44.777Z", "surfaceArea":975, "volume":4873000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1968, "congDist":"Congressional District 04, Oregon", "city":"BLUE RIVER", "county":"Lane", "aiannh":null, "websiteUrl":"https://www.nwp.usace.army.mil/Locations/Willamette-Valley/Blue-River/", "coreTypeIds":"3", "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"1;3", "nonFederalDamOnFederalId":0, "designerNames":"CENWP", "otherNames":"Blue River Lake", "ownerNames":"USACE - Portland District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;2;3;5", "dsacId":2, "femaRegion":"10", "lastEapExcerDate":"2025-06-06T12:00:00.000Z", "dataUpdated":"2025-06-06T12:00:00.000Z", "usaceDistrict":"Portland District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"170900", "doi_region":"CPN", "doi_region_name":"Columbia-Pacific Northwest", "doi_region_number":9, "thirtyYearAverage":81.0822, "tenthPercentile":76.9003, "ninetiethPercentile":88.3586 }, "id":50783029, "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/50783029?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/50783029?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/50783029?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }