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"latest_value":144234, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":550115, "associatedStructuresCount":1, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":342, "damLength":3600, "distance":null, "drainageArea":674, "eapId":1, "dsacAssignedDate":"2017-10-27T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2025-05-02T12:00:00.000Z", "eapLastRevDate":"2008-08-25T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"OR00612", "oldFederalId":"OR00612", "hazardId":4, "hydraulicHeight":332, "inspectionAuthorityId":0, "inspectionDate":"2021-07-21T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":42.6704802400001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-122.6743165409999, "maxDischarge":158000, "maxStorage":500000, "nidHeight":345, "nidStorage":500000, "normalStorage":465000, "numberOfLocks":0, "operationalStatusDate":"2017-10-27T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"William L Jess (Lost Creek) Dam is located on the main stem of the Rogue River in Jackson County, 10 miles upstream of Shady Cove, Ore., and 28 miles upstream of Medford, Ore. William L Jess Dam is a 327-foort tall 3600-foot long rockfill earthen embankment dam with a concrete spillway, three spillway gates, a multiple-level withdrawal structure, regulating outlet, and powerhouse. The dam was constructed from 1967 to 1977 to provide flood risk management, irrigation, hydroelectric power, and fisheries enhancement. Other purposes include wildlife enhancement, water quality improvement, and recreation. The watershed above William L Jess Dam is 674 square miles and predominantly forest land. \n\nThe dam is operated to reduce flooding during winter and spring months by temporarily holding back inflow to the reservoir and releasing flood waters after unregulated flows subside. William L Jess Dam serves to increase the summer and fall flows of Rogue River and to a lesser extent the navigable portion of the Rogue River by storing water into the drier summer months to provide steady flows for producing hydropower, supporting fish habitat, and providing water for irrigation. The multiple-level withdrawal structure that allows for the regulation of the water temperature released from the reservoir. The gated spillway allows for the passage of large flood events that fill the available flood storage in the reservoir. The spillway was designed to pass a maximum flood flow of approximately 169,000 cfs. The spillway has been used to pass flood flows one time in January 1997 with a maximum discharge measured at 14,300 cfs.", "riskCharSummary":"USACE completed a risk assessment on William L Jess Dam in 2017 that characterized the life-safety risks associated with the project as Moderate. The risk assessment found the risk to be driven by an unlikely scenario in which an extreme earthquake occurs at the same time reservoir elevations are the highest. In this scenario, an extreme earthquake causes the earthen dam to settle and crack, resulting in water over or through the dam. The speed and depth of water flowing over and through the damaged dam could erode the soil and rock that forms the dam and cause significant flooding downstream. The strong shaking from such an earthquake could also damage the spillway\u2019s concrete structure and gates, which could result in additional water flow in the river downstream. \n\nWilliam L Jess Dam is located approximately 55 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. \n\nUSACE is confident that the William L Jess Dam is 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 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":"The likelihood is low an extreme earthquake to occur that would severely damage William L Jess Dam, but the potential impacts of a dam failure are high due to the population downstream. USACE continues to evaluate the seismic performance of the embankment to determine if short-term targeted measures (called Interim Risk Reduction Measures), or long-term modifications will be necessary to reduce risk. USACE regularly conducts routine inspections of its dams and William L Jess 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. William L Jess Dam\u2019s Emergency Action Plan (EAP) outlines actions to be taken during an emergency. USACE will update the EAP based on the most recent 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":"ROGUE RIVER", "separateStructuresCount":1, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":135, "stateFedId":"OR00612", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":345, "submitDate":"2023-02-16T17:25:34.176Z", "surfaceArea":3430, "volume":10800000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1976, "congDist":"Congressional District 02, Oregon", "city":"TRAIL", "county":"Jackson", "aiannh":null, "websiteUrl":"https://nwp.usace.afpims.mil/Locations/Rogue-River/Lost-Creek/", "coreTypeIds":null, "damTypeIds":"5", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":"Lost Creek", "foundationTypeIds":null, "nonFederalDamOnFederalId":0, "designerNames":null, "otherNames":"Lost Creek Lake", "ownerNames":"USACE - Portland District", "ownerTypeIds":"3", "primaryDamTypeId":5, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;12;2;5;6", "dsacId":3, "femaRegion":"10", "lastEapExcerDate":"2025-05-02T12:00:00.000Z", "dataUpdated":"2025-05-27T12:00:00.000Z", "usaceDistrict":"Portland District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"171003", "doi_region":"CPN", "doi_region_name":"Columbia-Pacific Northwest", "doi_region_number":9, "thirtyYearAverage":531.4452, "tenthPercentile":487.3856, "ninetiethPercentile":555.5902 }, "id":48202029, "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/48202029?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/48202029?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/48202029?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }