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Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COT.Stor.Inst.0.Top of Conservation", "latest_value":31780, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COT.Stor.Inst.0.Top of Dam", "latest_value":55354, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COT.Stor.Inst.0.Top of Flood", "latest_value":32930, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of max flood", "label":"Top of Max Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COT.Stor.Inst.0.Top of Max Flood", "latest_value":47610, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of multi-purpose", "label":"Top of Multi-Purpose", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COT.Stor.Inst.0.Top of Multi-Purpose", "latest_value":31780, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of operating", "label":"Top of Operating", "parameter":"Stor", "base_parameter":"Stor", "tsid":"COT.Stor.Inst.0.Top of Operating", "latest_value":47610, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550117, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":81, "damLength":2110, "distance":null, "drainageArea":104, "eapId":1, "dsacAssignedDate":"2023-03-31T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2025-04-18T12:00:00.000Z", "eapLastRevDate":"2008-08-25T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"OR00005", "oldFederalId":"OR00005", "hazardId":4, "hydraulicHeight":76, "inspectionAuthorityId":0, "inspectionDate":"2022-04-19T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":43.716382223, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-123.053748455, "maxDischarge":40800, "maxStorage":50000, "nidHeight":103, "nidStorage":50000, "normalStorage":33000, "numberOfLocks":0, "operationalStatusDate":"2023-03-31T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"Cottage Grove Dam is located on the Coast Fork Willamette River, approximately 5 miles upstream of Cottage Grove, Oregon. Cottage Grove Dam is a 95ft tall, 1,750ft long earthen embankment dam with a 264ft long concrete ungated spillway, and a 96ft wide concrete non-overflow section. Cottage Grove Dam is owned, operated, and maintained by the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1940 and was completed in 1942. Cottage Grove Dam is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of hydropower, recreation, irrigation, municipal and industrial water supply, fish and wildlife, and water quality. Collectively, this system of dams is referred to as the Willamette Valley Project (WVP). Cottage Grove Dam is one of four WVP dams that does not include a powerhouse.\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 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.\n\nCottage Grove Dam is about 60 miles east of the Cascadia Subduction Zone, a megathrust fault along the Oregon Coast. Cascadia Subduction Zone, a megathrust fault along the Oregon Coast. The Cascadia Subduction Zone is capable of producing very large, long duration earthquakes. The last Cascadia Subduction Zone earthquake occurred in the year 1700.", "riskCharSummary":"USACE 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. USACE completed a routine risk assessment for Cottage Grove Dam in 2022. The next routine risk assessment is scheduled to occur in 2032. \n\nThe 2022 risk assessment identified the risk associated with the dam to be \u201cLow.\u201d According to the 2022 assessment, an extreme earthquake could cause damage to the earthen embankment dam leading to erosion of the embankment material or could damage the spillway structure. Because Cottage Grove Dam is located upstream of Cottage Grove, Oregon, there is potential for flooding to affect downstream populations in Cottage Grove as well as rural communities in the floodplain areas.\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 manages dam-related flood risks by continually monitoring the condition and health of the dam, prioritizing activities that will most impact the risks, and engaging upstream and downstream emergency managers and members of the public to raise awareness of the dam and support actions to prepare and be ready to respond in the case of a dam-related emergency. USACE works closely with local emergency managers to share what is known about the dam and support the development of local emergency and evacuation plans. USACE regularly updates the emergency action plan for the dam. Regular maintenance and repairs are performed as needed to keep the dam functioning properly.", "riverName":"COAST FORK WILLAMETTE RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":264, "stateFedId":"OR00005", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":103, "submitDate":"2023-02-16T17:25:42.150Z", "surfaceArea":1158, "volume":809000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1942, "congDist":"Congressional District 04, Oregon", "city":"COTTAGE GROVE", "county":"Lane", "aiannh":null, "websiteUrl":"https://www.nwp.usace.army.mil/Locations/Willamette-Valley/Cottage-Grove/", "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":"Cottage Grove Lake", "ownerNames":"USACE - Portland District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;2;3;5", "dsacId":4, "femaRegion":"10", "lastEapExcerDate":"2024-12-05T12:00:00.000Z", "dataUpdated":"2025-07-01T12:00:00.000Z", "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":28.6581, "tenthPercentile":26.9349, "ninetiethPercentile":30.0919 }, "id":50943029, "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/50943029?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/50943029?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/50943029?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }