{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -123.01, 38.7225 ] }, "properties":{ "provider":"SPN", "code":"Lake Sonoma", "slug":"lake%20sonoma", "elevation":495.08, "horizontal_datum":"WGS84", "vertical_datum":"NGVD29", "state":"CA", "kind":"PROJECT", "nearest_city":"Geyserville", "public_name":"Lake Sonoma / Warm Springs Dam", "location_code":3982116044, "nsid":null, "aliases":{ "NID Dam Name":"Warm Springs Dam", "NIDID":"CA10303" }, "timeseries":[ { "tsid":"Lake Sonoma-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":457.81, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"Lake Sonoma-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":263292.99, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"Lake Sonoma-Pool.Flow-Spill.Ave.1Hour.1Hour.Calc-val", "label":"Surcharge Release", "base_parameter":"Flow", "parameter":"Flow-Spill", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:00:00Z", "latest_value":0.0, "delta24h":null, "sort_order":8, "results":null }, { "tsid":"Lake Sonoma-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":69.6, "delta24h":null, "sort_order":22, "results":null }, { "tsid":"Lake Sonoma-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 Sonoma-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":263292.99, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"Lake Sonoma.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":"2026-04-14T22:00:00Z", "latest_value":83.59, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"Lake Sonoma.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":422.39, "delta24h":null, "sort_order":6, "results":null } ], "name":"Lake Sonoma / Warm Springs Dam", "hasResopsAverages":"false", "nidId":"CA10303", "nidid":"", "levels":[ { "slug":"elev.bottom of flood", "label":"Bottom of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Sonoma.Elev.Inst.0.Bottom of Flood", "latest_value":451.1, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Sonoma.Elev.Inst.0.Streambed", "latest_value":200, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Sonoma.Elev.Inst.0.Top of Conservation", "latest_value":451.1, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Sonoma.Elev.Inst.0.Top of Dam", "latest_value":519, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Sonoma.Elev.Inst.0.Top of Flood", "latest_value":501, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of gross", "label":"Top of Gross", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Sonoma.Elev.Inst.0.Top of Gross", "latest_value":495, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of gross pool", "label":"Top of Gross Pool", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Sonoma.Elev.Inst.0.Top of Gross Pool", "latest_value":495, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of inactive", "label":"Top of Inactive", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Sonoma.Elev.Inst.0.Top of Inactive", "latest_value":292, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of surcharge", "label":"Top of Surcharge", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Lake Sonoma.Elev.Inst.0.Top of Surcharge", "latest_value":513.1, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of flood", "label":"Bottom of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Sonoma.Stor.Inst.0.Bottom of Flood", "latest_value":245000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Sonoma.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 Sonoma.Stor.Inst.0.Top of Conservation", "latest_value":245000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of dam", "label":"Top of Dam", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Sonoma.Stor.Inst.0.Top of Dam", "latest_value":472948, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Sonoma.Stor.Inst.0.Top of Flood", "latest_value":403000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of gross", "label":"Top of Gross", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Sonoma.Stor.Inst.0.Top of Gross", "latest_value":381000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of gross pool", "label":"Top of Gross Pool", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Sonoma.Stor.Inst.0.Top of Gross Pool", "latest_value":381000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of inactive", "label":"Top of Inactive", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Sonoma.Stor.Inst.0.Top of Inactive", "latest_value":20000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of surcharge", "label":"Top of Surcharge", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Lake Sonoma.Stor.Inst.0.Top of Surcharge", "latest_value":449000, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549853, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":319, "damLength":3000, "distance":12, "drainageArea":130, "eapId":1, "dsacAssignedDate":"2009-05-12T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-09-06T12:00:00.000Z", "eapLastRevDate":"2024-09-06T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"CA10303", "oldFederalId":"CA10303", "hazardId":4, "hydraulicHeight":313, "inspectionAuthorityId":0, "inspectionDate":"2021-09-27T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":38.718423731, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-123.009619915, "maxDischarge":29600, "maxStorage":449000, "nidHeight":356, "nidStorage":449000, "normalStorage":245000, "numberOfLocks":0, "operationalStatusDate":"2009-05-12T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"Warm Springs Dam is in northern California\u2019s Sonoma County. It is on Dry Creek about 14 miles above its confluence with the Russian River and approximately 12 miles north of the City of Healdsburg. The dam holds back water to form Lake Sonoma. The Warm Springs Dam and Lake Sonoma project was authorized by the Flood Control Act of 1962 to provide flood risk management, water supply, and recreation. Dam construction began in 1970 and was completed in 1983. Warm Springs Dam was built as an earth fill embankment, along with an outlet structure and concrete spillway. The top of the dam is 3,000 feet long at an elevation 521.0 feet above sea level. \n\nThe dam was originally built with boating, camping facilities and picnic areas. In 1981, a visitor center, the Congressman Don Clausen Fish Hatchery and a wildlife conservation area were added to mitigate the environmental impacts of the dam. The fish hatchery for salmon and steelhead is operated by the California Department of Fish and Wildlife. In 1989, hydroelectric power generation was added by Sonoma County Water Agency.", "riskCharSummary":"Dams 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. More detail related to this specific dam will be added at a future time.", "riskManagementMeasures":"USACE dams are operated and maintained following guidelines that continuously reduce risk to the public downstream. Risk reduction measures, based on the risk assessment findings, have been implemented at Warm Springs Dam. These include enhanced monitoring and surveillance of the dam during higher than normal pool elevations, and an emergency action plan. Weather conditions are monitored days in advance of an approaching storm, providing a forecast of rainfall at the dam\u2019s watershed and water inflow to the dams\u2019 storage pool. These forecasts are used to maintain the lake\u2019s pool at safe levels, preventing a spill over the dam's crest.\n \nWarm Springs Dam is under constant monitoring by dam maintenance and operations staff, who are trained to identify dam safety concerns. Dam Safety Engineers also regularly oversee conditions. During storm conditions when reservoir levels are high and/or large amounts of water are being released from the dam, the staff is extra vigilant.\n\nSecond, USACE developed an emergency action plan (EAP) specifically for Warm Springs Dam and shared it with local and state emergency managers. The EAP clarifies communication and response actions to be taken whenever conditions at the dam have the potential to affect public safety. Coordinated implementation of the plan ensures clear, quick responses such as providing warnings and proactive evacuation orders so that those living and working can move out of harm\u2019s way.", "riverName":"DRY CREEK", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":100, "stateFedId":"CA10303", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":356, "submitDate":"2023-02-16T17:25:41.447Z", "surfaceArea":2600, "volume":0, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1983, "congDist":"Congressional District 02, California", "city":"HEALDSBURG", "county":"Sonoma", "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":"1;3", "nonFederalDamOnFederalId":0, "designerNames":null, "otherNames":"Lake Sonoma", "ownerNames":"USACE - San Francisco District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;5;6;8", "dsacId":4, "femaRegion":"9", "lastEapExcerDate":"2024-09-09T12:00:00.000Z", "dataUpdated":"2024-12-17T12:00:00.000Z", "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 }, "id":3982116044, "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/3982116044?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/3982116044?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/3982116044?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }