{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -121.93131, 47.1422 ] }, "properties":{ "provider":"NWS", "code":"MMD", "slug":"mmd", "elevation":null, "horizontal_datum":"WGS84", "vertical_datum":"NGVD29", "state":"WA", "kind":"PROJECT", "nearest_city":"Buckley", "public_name":"Mud Mountain Dam nr Buckley WA", "location_code":54054029, "nsid":null, "aliases":{ "NIDID":"WA00300" }, "timeseries":[ { "tsid":"MMD.Stor.Inst.1Hour.0.IRIDIUM-REV", "label":"Flood Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":46.9, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"MMD.Elev-Forebay.Inst.1Hour.0.IRIDIUM-REV", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev-Forebay", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":928.59, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"MMD.Flow-Out.Inst.1Hour.0.NWSRADIO-COMPUTED-RAW", "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":1839.29, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"MMD.Flow-In.Inst.1Hour.0.NWSRADIO-COMPUTED-RAW", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow-In", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":1838.08, "delta24h":null, "sort_order":6, "results":null } ], "name":"Mud Mountain Dam nr Buckley WA", "hasResopsAverages":"false", "nidId":"WA00300", "nidid":"", "levels":[ { "slug":"elev.bottom of flood", "label":"Bottom of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MMD.Elev.Const.1Hour.Bottom of Flood", "latest_value":895, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.bottom of flood control", "label":"Bottom of Flood Control", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MMD.Elev.Const.1Hour.Bottom of Flood Control", "latest_value":895, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.bottom of normal", "label":"Bottom of Normal", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MMD.Elev.Const.1Hour.Bottom of Normal", "latest_value":895, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.spillway crest", "label":"Spillway Crest", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MMD.Elev.Const.1Hour.Spillway Crest", "latest_value":1215, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MMD.Elev.Const.1Hour.Streambed", "latest_value":895, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MMD.Elev.Const.1Hour.Top of Dam", "latest_value":1257, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MMD.Elev.Const.1Hour.Top of Flood", "latest_value":1215, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of normal", "label":"Top of Normal", "parameter":"Elev", "base_parameter":"Elev", "tsid":"MMD.Elev.Const.1Hour.Top of Normal", "latest_value":930, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of flood", "label":"Bottom of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MMD.Stor.Inst.0.Bottom of Flood", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.bottom of flood control", "label":"Bottom of Flood Control", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MMD.Stor.Inst.0.Bottom of Flood Control", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.bottom of normal", "label":"Bottom of Normal", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MMD.Stor.Inst.0.Bottom of Normal", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.spillway crest", "label":"Spillway Crest", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MMD.Stor.Inst.0.Spillway Crest", "latest_value":102041, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MMD.Stor.Inst.0.Streambed", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MMD.Stor.Inst.0.Top of Dam", "latest_value":150098, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MMD.Stor.Inst.0.Top of Flood", "latest_value":106000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of normal", "label":"Top of Normal", "parameter":"Stor", "base_parameter":"Stor", "tsid":"MMD.Stor.Inst.0.Top of Normal", "latest_value":4, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549894, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":700, "distance":5, "drainageArea":400, "eapId":1, "dsacAssignedDate":"2020-03-14T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-11-01T12:00:00.000Z", "eapLastRevDate":"2024-11-22T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"WA00300", "oldFederalId":"WA00300", "hazardId":4, "hydraulicHeight":350, "inspectionAuthorityId":0, "inspectionDate":"2021-05-15T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":47.140965565, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-121.933329497, "maxDischarge":156000, "maxStorage":106000, "nidHeight":425, "nidStorage":106000, "normalStorage":0, "numberOfLocks":0, "operationalStatusDate":"2020-03-14T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) completed Mud Mountain Dam in 1948. The dam is located on the White River, near Enumclaw, Washington, approximately 30 miles upstream of the confluence with the Puyallup River. Mud Mountain Dam\u2019s single purpose is to reduce downstream flood risk for Auburn, Pacific, Puyallup, and Tacoma by storing water during major flood events. The dam structure is an earthen embankment. A concrete outlet tower and outlet tunnel through bedrock are used to pass river flows during most conditions. A concrete spillway is also available to release large flows during extreme flood events. In addition to the dam, the White River/Puyallup levee system helps reduce flood risks.", "riskCharSummary":"USACE completed a risk assessment for Mud Mountain Dam in September 2019 to determine potential threats to the ability of USACE to meet the flood risk management goals of the dam. As a result, the project\u2019s risk is characterized as low. The project\u2019s spillway has never been used, but in the unlikely event the concrete lining failed during spillway use, the underlying bedrock could erode, causing the dam\u2019s crest to be lowered, and an uncontrolled surge of reservoir water could be released. This would result in deadly flooding and economic damages in downstream communities. A second unlikely scenario involving overtopping of the dam during an extreme flood event would result in similar damage and downstream consequences. Although these failure scenarios are considered extremely unlikely, USACE maintains a Mud Mountain Dam Emergency Action Plan to lower the risk of life loss and property damage if any of these scenarios occurred.\n\nUSACE is confident that the dam is solidly built, well-maintained, and will continue to significantly reduce flood risks and perform well during an earthquake. However, the dam alone cannot eliminate flooding. Extreme rainfall events could require USACE to release rising water through the dam\u2019s outlet tunnel and/or the spillway to prevent overtopping and failure of the dam. This extreme case could result in flooding areas downstream, and flooding could be similar to what was experienced prior to the dam\u2019s construction.", "riskManagementMeasures":"USACE is continuously taking significant steps to reduce risks to life safety and property, including major dam modifications. USACE conducts regular inspections and maintains a network of instruments to monitor the health of the dam. The frequency of inspections increases when conditions change 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 water 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 management meetings with stakeholders.", "riverName":"WHITE RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":315, "stateFedId":"WA00300", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":425, "submitDate":"2023-10-25T20:01:08.507Z", "surfaceArea":1, "volume":2300000, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1948, "congDist":"Congressional District 08, Washington", "city":"BUCKLEY", "county":"King", "aiannh":null, "websiteUrl":"https://www.nws.usace.army.mil/Missions/Civil-Works/Locks-and-Dams/Mud-Mountain-Dam/", "coreTypeIds":null, "damTypeIds":"5", "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":"Mud Mountain Lake", "ownerNames":"USACE - Seattle District", "ownerTypeIds":"3", "primaryDamTypeId":5, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;5", "dsacId":4, "femaRegion":"10", "lastEapExcerDate":"2024-09-11T12:00:00.000Z", "dataUpdated":"2025-04-18T12:00:00.000Z", "usaceDistrict":"Seattle District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"171100", "doi_region":"CPN", "doi_region_name":"Columbia-Pacific Northwest", "doi_region_number":9 }, "id":54054029, "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/54054029?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/54054029?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/54054029?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }