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"tsid":"WIL.Stor.Inst.0.Spillway Crest", "latest_value":13890, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"WIL.Stor.Inst.0.Top of Conservation", "latest_value":6000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"WIL.Stor.Inst.0.Top of Dam", "latest_value":17300, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"WIL.Stor.Inst.0.Top of Flood", "latest_value":13890, "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":"WIL.Stor.Inst.0.Top of Max Flood", "latest_value":17100, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of 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"inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":45.3470498080001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-119.544530776, "maxDischarge":91700, "maxStorage":14091, "nidHeight":160, "nidStorage":14091, "normalStorage":4326, "numberOfLocks":0, "operationalStatusDate":"2018-11-26T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"Willow Creek Dam is located in the town of Heppner, Ore. about 50 miles southwest of Pendleton. The dam is situated on Willow Creek which is a tributary to the Columbia River. Willow Creek Dam was constructed in 1983 and is the first dam constructed entirely using roller-compacted concrete (RCC). The total length of the dam is 1,780-feet with a maximum height of 157-feet. The dam includes two non-overflow sections, an ungated spillway section with a concrete stilling basin, and an outlet works. The authorized purposes at this project are flood risk management, irrigation, recreation, sports fishing and wildlife.", "riskCharSummary":"USACE completed a risk assessment for Willow Creek Dam in 2017 that characterized the life-safety risks associated with the project as low. The assessment determined that a large earthquake could cause instability along concrete joints in the RCC dam and release water through the dam, flooding downstream communities. The assessment also determined that the high flows from a large and unlikely flood could damage and erode the ungated spillway, but the short duration of flooding would limit potential impacts to downstream communities. The team concluded that the likelihood of earthquake damage to the RCC dam is very low since the dam is in an area of low earthquake hazard. \n\nUSACE is confident that the Willow Creek Dam is well-built, well-maintained, and will continue to significantly reduce flood risks for the region. However, dams cannot eliminate potential for flooding. Even with the presence of the flood risk management 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 regularly conducts routine inspections of its dams and will continue to evaluate the condition and risks associated with Willow Creek Dam through routine studies. Willow Creek is equipped with instrumentation to monitor dam performance, including new sensors installed in 2018 to monitor the conditions along the RCC joints. USACE is updating its Emergency Action Plan based on the results of the risk assessment to improve risk communication and increase public awareness. USACE regularly conducts routine inspections of its dams. Post-earthquake procedures are in place to inspect and evaluate earthquake damages. USACE will continue and increase its outreach to improve community awareness of flood risks and risks associated with the dam.", "riverName":"WILLOW CREEK", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":380, "stateFedId":"OR00746", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":160, "submitDate":"2023-02-16T17:25:30.522Z", "surfaceArea":269, "volume":403000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1982, "congDist":"Congressional District 02, Oregon", "city":"HEPPNER", "county":"Morrow", "aiannh":null, "websiteUrl":"https://www.nwp.usace.army.mil/willow-creek/", "coreTypeIds":"2", "damTypeIds":null, "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"1", "nonFederalDamOnFederalId":0, "designerNames":null, "otherNames":"Willow Creek Lake", "ownerNames":"USACE - Portland District", "ownerTypeIds":"3", "primaryDamTypeId":null, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;2;5", "dsacId":4, "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":"170701", "doi_region":"CPN", "doi_region_name":"Columbia-Pacific Northwest", "doi_region_number":9, "thirtyYearAverage":7.267, "tenthPercentile":6.441, "ninetiethPercentile":7.7402 }, "id":47608029, "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/47608029?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/47608029?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/47608029?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }