{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -123.18056, 39.19806 ] }, "properties":{ "provider":"SPN", "code":"Lake Mendocino", "slug":"lake%20mendocino", "elevation":789.01, "horizontal_datum":"WGS84", "vertical_datum":"NGVD29", "state":"CA", "kind":"PROJECT", "nearest_city":"Ukiah", "public_name":"Lake Mendocino / Coyote Dam", "location_code":3965072044, "nsid":null, "aliases":{ "NIDID":"CA10201" }, "timeseries":[ { "tsid":"Lake Mendocino.Flow-Res In.Ave.1Hour.1Hour.Calc-val", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow-Res In", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":-85.29, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"Lake Mendocino-Pool.Elev.Inst.1Hour.0.Calc-val", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":746.81, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"Lake Mendocino-Weather Station.Temp-Air.Inst.1Hour.0.Calc-val", "label":"Air Temperature", "base_parameter":"Temp", "parameter":"Temp-Air", "unit":"F", "unit_long_name":"Fahrenheit", "latest_time":"2026-04-14T22:00:00Z", "latest_value":64.7, "delta24h":null, "sort_order":22, "results":null }, { "tsid":"Lake Mendocino.Flow-Res Out.Ave.1Hour.1Hour.Calc-val", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Res Out", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T23:00:00Z", "latest_value":71.88, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"Lake Mendocino-Weather Station.Precip-INC.Total.1Hour.1Hour.Calc-val", "label":"Precipitation", "base_parameter":"Precip", "parameter":"Precip-INC", "unit":"in", "unit_long_name":"Inches", "latest_time":"2026-04-14T23:00:00Z", "latest_value":0.0, "delta24h":null, "sort_order":16, "results":null }, { "tsid":"Lake Mendocino-Pool.Stor.Inst.1Hour.0.Calc-val", "label":"Conservation Storage", "base_parameter":"Stor", "parameter":"Stor", "unit":"ac-ft", "unit_long_name":"Acre-feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":84296.0, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"Lake Mendocino-Pool.Stor.Inst.1Hour.0.Calc-val", "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":84296.0, "delta24h":null, "sort_order":11, "results":null } ], "name":"Lake Mendocino / Coyote Dam", "hasResopsAverages":"true", "nidId":"CA10201", "nidid":"", "levels":[ { "slug":"elev.bottom of flood", "label":"Bottom of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Mendocino.Elev.Inst.0.Bottom of Flood", "latest_value":752.56, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Mendocino.Elev.Inst.0.Streambed", "latest_value":624, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Mendocino.Elev.Inst.0.Top of Conservation", "latest_value":752.56, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Mendocino.Elev.Inst.0.Top of Dam", "latest_value":784, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Mendocino.Elev.Inst.0.Top of Flood", "latest_value":772.4, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of gross", "label":"Top of Gross", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Mendocino.Elev.Inst.0.Top of Gross", "latest_value":764.8, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Mendocino.Elev.Inst.0.Top of Inactive", "latest_value":637, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of surcharge", "label":"Top of Surcharge", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Mendocino.Elev.Inst.0.Top of Surcharge", "latest_value":781.1, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of flood", "label":"Bottom of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Mendocino.Stor.Inst.0.Bottom of Flood", "latest_value":null, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Mendocino.Stor.Inst.0.Streambed", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of conservation", "label":"Top of Conservation", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Mendocino.Stor.Inst.0.Top of Conservation", "latest_value":null, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Mendocino.Stor.Inst.0.Top of Dam", "latest_value":155500, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Mendocino.Stor.Inst.0.Top of Flood", "latest_value":137300, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of gross", "label":"Top of Gross", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Mendocino.Stor.Inst.0.Top of Gross", "latest_value":116470, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Mendocino.Stor.Inst.0.Top of Inactive", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of surcharge", "label":"Top of Surcharge", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Mendocino.Stor.Inst.0.Top of Surcharge", "latest_value":155500, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549837, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":164, "damLength":3525, "distance":2, "drainageArea":105, "eapId":1, "dsacAssignedDate":"2025-05-09T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-09-06T12:00:00.000Z", "eapLastRevDate":"2024-09-06T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"CA10201", "oldFederalId":"CA10201", "hazardId":4, "hydraulicHeight":161, "inspectionAuthorityId":0, "inspectionDate":"2022-07-21T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":39.1987990000001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-123.1833, "maxDischarge":35800, "maxStorage":155500, "nidHeight":180, "nidStorage":155500, "normalStorage":74500, "numberOfLocks":0, "operationalStatusDate":"2012-11-05T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"Lake Mendocino is formed by water held behind Coyote Valley Dam. Coyote Valley Dam is located on the East Fork of the Russian River, approximately 5 miles to the northeast of Ukiah, California. Coyote Valley Dam was constructed by the U.S. Army Corps of Engineers (USACE) in 1959 for flood control, water supply, recreation, and stream-flow regulation. Coyote Valley Dam is an earth-fill dam with a 12-foot diameter pipe through the dam to allow for water releases. The dam is owned and operated by USACE. The City of Ukiah uses water from Lake Mendocino for electric power generation.", "riskCharSummary":"The USACE conducted a dam safety risk assessment of Coyote Valley Dam in 2022 and classified the dam as low risk. The combination of life or economic consequences with the likelihood of failure of the dam is low and USACE considers this level of life-risk to be acceptable. The main factor driving the risk of Coyote Valley Dam (in case of a very rare series of rain events) is overtopping of the main dam (beyond spillway) that can lead to erosion and breach of the main embankment. The primary consequence center is Ukiah, California with a population at risk between 20,000 to 25,000.\n\nDams do not eliminate all risk of flooding. USACE works to address all types of flood risk associated with the dam. Dams have limited capacity to store water. Water may be released through the dam to manage water levels up or downstream or to relieve pressure on the dam to maintain its structural integrity. Severe weather events that bring inconsistent or larger amounts of water into the system can also lead to dam releases or in some cases overwhelm and lead to issues occurring at a dam.", "riskManagementMeasures":"USACE is continuously taking action to operate and maintain its dams in a safe and reliable manner in order to reduce risk to the public downstream. Risk reduction measures based on the risk assessment and USACE policy have been implemented. These include emergency preparation, enhanced monitoring and surveillance of the dam under certain scenarios (such as higher than normal pool elevations). \n\nCoyote Valley Dam is under constant monitoring by dam maintenance and operations staff, who are trained to identify dam safety concerns. During flood events when reservoir levels and/or outflows from the dam are high, the staff is extra vigilant. The dam's performance is monitored by instrumentation which are annually reviewed by the dam safety engineers. \n\nThe dam's emergency action plan (EAP) provides guidance for communication and actions during developing dam safety situations. The EAP has been shared with local and state emergency managers for their awareness and action. The EAP is intended to ensure quick response and provide proactive warnings in order to evacuate people out of harm's way downstream whenever it is needed.", "riverName":"EAST FORK RUSSIAN RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":250, "stateFedId":"CA10201", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":180, "submitDate":"2023-02-16T17:25:30.069Z", "surfaceArea":1740, "volume":0, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1959, "congDist":"Congressional District 02, California", "city":"UKIAH", "county":"Mendocino", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":"3", "damTypeIds":"8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"3", "nonFederalDamOnFederalId":0, "designerNames":"CESPN", "otherNames":"Lake Mendocino", "ownerNames":"USACE - San Francisco District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;5;6;8", "dsacId":4, "femaRegion":"9", "lastEapExcerDate":"2024-09-10T12:00:00.000Z", "dataUpdated":"2025-05-14T12:00:00.000Z", "usaceDistrict":"San Francisco District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"180101", "doi_region":"CGB", "doi_region_name":"California-Great Basin", "doi_region_number":10, "thirtyYearAverage":101.7623, "tenthPercentile":76.6724, "ninetiethPercentile":113.5718 }, "id":3965072044, "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/3965072044?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/3965072044?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/3965072044?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }