{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -120.935, 37.915 ] }, "properties":{ "provider":"SPK", "code":"Farmington Dam", "slug":"farmington%20dam", "elevation":179.99, "horizontal_datum":"", "vertical_datum":"NGVD29", "state":"CA", "kind":"PROJECT", "nearest_city":"Oakdale", "public_name":"Farmington Dam & Reservoir", "location_code":3981004044, "nsid":null, "aliases":{ "NIDID":"CA10104" }, "timeseries":[ { "tsid":"Farmington Dam-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":5.0, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"Farmington Dam-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":117.26, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"Farmington Dam.Flow-Res In.Ave.1Hour.1Hour.Calc-RCF+FRMQ", "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":36.44, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"Farmington Dam-Pool.Precip-INC.Total.1Hour.1Hour.Calc-val", "label":"Precipitation", "base_parameter":"Precip", "parameter":"Precip-INC", "unit":"in", "unit_long_name":"Inches", "latest_time":"2026-04-14T22:00:00Z", "latest_value":0.0, "delta24h":null, "sort_order":16, "results":null }, { "tsid":"Farmington Dam-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":5.0, "delta24h":null, "sort_order":11, "results":null }, { "tsid":"Farmington Dam.Flow-Res Out.Ave.1Hour.1Hour.Calc-RCF+FRMQ", 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"latest_value":115, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Farmington Dam.Elev.Inst.0.Top of Dam", "latest_value":174, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Farmington Dam.Elev.Inst.0.Top of Flood", "latest_value":156.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of gross pool", "label":"Top of Gross Pool", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Farmington Dam.Elev.Inst.0.Top of Gross Pool", "latest_value":156.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of surcharge", "label":"Top of Surcharge", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Farmington Dam.Elev.Inst.0.Top of Surcharge", "latest_value":169, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of flood", "label":"Bottom of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Farmington Dam.Stor.Inst.0.Bottom of Flood", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Farmington Dam.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":"Farmington Dam.Stor.Inst.0.Top of Dam", "latest_value":153337.38, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Farmington Dam.Stor.Inst.0.Top of Flood", "latest_value":52000, "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":"Farmington Dam.Stor.Inst.0.Top of Gross Pool", "latest_value":52000, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of surcharge", "label":"Top of Surcharge", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Farmington Dam.Stor.Inst.0.Top of Surcharge", "latest_value":120000, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549814, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":58, "damLength":7800, "distance":4, "drainageArea":212, "eapId":1, "dsacAssignedDate":"2008-12-01T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-07-16T12:00:00.000Z", "eapLastRevDate":"2024-07-01T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"CA10104", "oldFederalId":"CA10104", "hazardId":4, "hydraulicHeight":53, "inspectionAuthorityId":0, "inspectionDate":"2025-07-14T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":37.9068014100001, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-120.934059256, "maxDischarge":12600, "maxStorage":119314, "nidHeight":58, "nidStorage":119314, "normalStorage":6623, "numberOfLocks":0, "operationalStatusDate":"2008-12-01T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) built Farmington Dam in 1951. Farmington Dam is mostly surrounded by farmland and is located approximately 20 miles east of Stockton and approximately 3.5 miles east of Farmington. The dam is a compacted earthfill structure with an ungated spillway section that is located on the northern end of the dam. On the upstream side of the dam is the normally dry Farmington Reservoir, which only contains water when large rain events occur. The dam spans across two waterways: Littlejohn Creek, and Rock Creek. The purpose of Farmington Dam is to reduce the frequency of flooding throughout the network of channels downstream and protect the city of Stockton, the rural towns of French Camp and Farmington, and other nearby communities.", "riskCharSummary":"USACE completed a risk assessment for Farmington Dam in 2008 to understand how the dam might perform during certain scenarios and found the likelihood of the dam overtopping or failing in those cases to be moderate. Factors that pose some concerns and that might cause flooding downstream of the dam include extreme rainfall, snow melting in the Sierras, and earthquakes. A very large rainfall and snowmelt event with unusually large quantities of water could lead to larger than normal outflows of water through the dam and spillway. Such a scenario could cause downstream flooding even when the dam operates as intended. The most devastating potential scenario would occur if the dam were subjected to an extreme earthquake while the reservoir level was already high. In this unlikely event, an uncontrolled surge of water could flow out of the reservoir, resulting in potentially deadly flooding of downstream communities. Another potential scenario involves water seeping through the dam materials, which could lead to uncontrolled loss of water from the reservoir. The downstream communities at risk primarily include the cities of Farmington and Stockton. Potentially impacted infrastructure includes road networks, electrical substations, communication facilities, police and fire stations, hospitals, airports, and schools. A large portion of farmland will also be impacted. Although these scenarios are considered extremely unlikely, there is an emergency action plan for Farmington Dam to lower the risk of life loss if any of these scenarios occurred.", "riskManagementMeasures":"USACE works closely with local emergency managers, regularly updates the emergency action plan, and conducts emergency exercises with state, federal, and local partners, all of which help reduce risk to the public. USACE performs regular inspections and instrument monitoring to ensure that the structure is performing as designed and could help detect any areas of potential concern. The frequency of these checks increases when the reservoir rises. USACE incorporates weather forecasts to make informed decisions on how to operate the dam. The releases at Farmington Dam are determined using the knowledge of local flows in the system and there may be situations where these localized flows change quickly and could affect the downstream communities. In most scenarios, the downstream communities would have a coordinated warning notification within minutes to hours depending on location before water reaches their homes. However, during very large and rare earthquake events, there may be little to no warning.", "riverName":"ROCK AND LITTLEJOHN CREEKS", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":95, "stateFedId":"CA10104", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":58, "submitDate":"2023-02-16T17:25:36.792Z", "surfaceArea":4100, "volume":0, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1951, "congDist":"Congressional District 09, California", "city":"FARMINGTON", "county":"San Joaquin", "aiannh":null, "websiteUrl":"https://www.spk.usace.army.mil/Missions/Civil-Works/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":null, "nonFederalDamOnFederalId":0, "designerNames":null, "otherNames":"Farmington Reservoir", "ownerNames":"USACE - Sacramento District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;2;6;8", "dsacId":3, "femaRegion":"9", "lastEapExcerDate":"2025-04-30T12:00:00.000Z", "dataUpdated":"2025-07-08T12:00:00.000Z", "usaceDistrict":"Sacramento District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"180400", "doi_region":"CGB", "doi_region_name":"California-Great Basin", "doi_region_number":10, "thirtyYearAverage":0.4479, "tenthPercentile":0.0, "ninetiethPercentile":0.2608 }, "id":3981004044, "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/3981004044?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/3981004044?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/3981004044?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }