{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -117.23806, 34.3425 ] }, "properties":{ "provider":"SPL", "code":"Mojave", "slug":"mojave", "elevation":3172.0, "horizontal_datum":"WGS84", "vertical_datum":"NGVD29", "state":"CA", "kind":"PROJECT", "nearest_city":"Apple Valley", "public_name":"Mojave Dam", "location_code":674145, "nsid":null, "aliases":{ "NIDID":"CA10021" }, "timeseries":[ { "tsid":"Mojave.Precip.Inst.1Hour.0.GOES-rev", "label":"Precipitation", "base_parameter":"Precip", "parameter":"Precip", "unit":"in", "unit_long_name":"Inches", "latest_time":"2026-04-14T22:00:00Z", "latest_value":13.67, "delta24h":null, "sort_order":16, "results":null } ], "name":"Mojave Dam", "hasResopsAverages":"false", "nidId":"CA10021", "nidid":"", "levels":[ { "slug":"elev.bottom of flood control", "label":"Bottom of Flood Control", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Mojave.Elev.Inst.0.Bottom of Flood Control", "latest_value":2988, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Mojave.Elev.Inst.0.Streambed", "latest_value":2988, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Mojave.Elev.Inst.0.Top of Dam", "latest_value":3172, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of flood", "label":"Top of Flood", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Mojave.Elev.Inst.0.Top of Flood", "latest_value":3134, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of flood control", "label":"Bottom of Flood Control", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Mojave.Stor.Inst.0.Bottom of Flood Control", "latest_value":0, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Mojave.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":"Mojave.Stor.Inst.0.Top of Dam", "latest_value":190900, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of flood", "label":"Top of Flood", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Mojave.Stor.Inst.0.Top of Flood", "latest_value":89670, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549829, "associatedStructuresCount":1, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":200, "damLength":2200, "distance":null, "drainageArea":215, "eapId":1, "dsacAssignedDate":"2022-12-22T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2025-04-22T12:00:00.000Z", "eapLastRevDate":"2019-10-31T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"CA10021", "oldFederalId":"CA10021", "hazardId":4, "hydraulicHeight":193, "inspectionAuthorityId":0, "inspectionDate":"2023-04-25T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":34.343629423, "lengthOfLocks":0, "secondaryLengthOfLocks":null, "longitude":-117.234683543, "maxDischarge":105400, "maxStorage":179400, "nidHeight":200, "nidStorage":179400, "normalStorage":0, "numberOfLocks":0, "operationalStatusDate":"2022-12-22T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) built Mojave River Dam in 1971 to reduce the risk of flooding to downstream communities along the Mojave River, including Hesperia, Apple Valley, Victorville and Barstow in San Bernardino County, California. The dam is located adjacent to the Pacific Crest Trail and where the West Fork Mojave River and Deep Creek join and form the Mojave River. Mojave River Dam is an earthen embankment and contains one outlet structure and a large concrete lined spillway with a 200 feet long crest. There are no gates on the dam because it is not designed to stop water; it is only designed to slow down the water's velocity to reduce the potential for out-of-channel flooding. There is typically no pool. The dam continues to operate as it was designed and reduces flood risk for more than 16,000 people and $1.5 billion in property.", "riskCharSummary":"In 2018, USACE completed a risk assessment of Mojave River Dam and reclassified the risk associated with the dam as \"High\". Although Mojave River Dam reduces the risk of flooding to downstream communities, the dam doesn't eliminate the risk of flooding. \n\nThere are two unlikely scenarios that could result in downstream flooding. One scenario is that a significant rainfall event in the watershed that drains to the dam produces enough runoff that it fills the reservoir and then continues to pass significant volumes of water through the ungated spillway. This spillway serves to protect the integrity of the dam, but it can pass enough water to cause damaging flooding in downstream communities. The second, more unlikely but far more devastating scenario is an extreme rainfall event that results in water flowing over the earthen dam, which erodes the dam and causes it to breach. An uncontrolled surge of water would inundate downstream communities with higher flood depths. Both scenarios could produce enough floodwater to destroy buildings and key infrastructure, and those caught unaware and/or unable to evacuate could perish. If the dam breached, the water depth, property damage and lives lost would likely be far greater. \n\nAdditionally, the local conditions contribute to the \"High\" risk classification. The mountains and steep hills upstream of the Mojave River Dam means precipitation runs downstream rapidly and rivers rise quickly. Furthermore, storms in this region can be intense and localized, so it could be raining heavily in the mountains, but the weather could be sunny and dry in lowland areas, like in Apple Valley, Victorville, Hesperia and Barstow. If these conditions cause flooding downstream of the dam, the communities could be unprepared for flooding.\n\nThe communities downstream of the dam \u201c Hesperia, Apple Valley and Victorville\u201c are in a greater danger from deep and fast moving water in the event of a flood. Communities further downstream, including Oro Grande, Helendale, Barstow, Daggett, Yermo, Newberry Springs, Harvard and Baker \u201c which is about 140 miles downstream of the dam\" could also see property damage; however, those communities would have longer warning times in the event that an evacuation is needed.", "riskManagementMeasures":"To ensure USACE is taking all steps to reduce the risk to the public, USACE will continue to work closely with state and local emergency managers, conducting emergency exercises and incorporating any new information into our emergency action plan. USACE closely follows rainfall forecasts to determine when high water events may occur to provide information for any necessary flood warnings. USACE is working with local communities to provide opportunities to engage with residents and schools to help them understand how they can better prepare for a flood. Additionally, USACE is implementing temporary measures to reduce the risk of water flowing over the top of the dam.", "riverName":"WEST FORK MOJAVE RIVER", "separateStructuresCount":1, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":3, "spillwayWidth":200, "stateFedId":"CA10021", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":null, "submitDate":"2023-02-16T17:25:21.739Z", "surfaceArea":1, "volume":0, "widthOfLocks":0, "secondaryWidthOfLocks":null, "yearCompleted":1971, "congDist":"Congressional District 23, California", "city":"VICTORVILLE", "county":"San Bernardino", "aiannh":null, "websiteUrl":"https://www.spl.usace.army.mil/Missions/Operations-Division/Mojave-River-Dam/", "coreTypeIds":null, "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":"CESPL", "otherNames":"Mojave Reservoir", "ownerNames":"USACE - Los Angeles District", "ownerTypeIds":"3", "primaryDamTypeId":8, "primaryOwnerTypeId":3, "primaryPurposeId":9, "purposeIds":"9;5", "dsacId":2, "femaRegion":"9", "lastEapExcerDate":"2023-06-05T12:00:00.000Z", "dataUpdated":"2025-04-23T12:00:00.000Z", "usaceDistrict":"Los Angeles District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"180902", "doi_region":"LCB", "doi_region_name":"Lower Colorado Basin", "doi_region_number":8 }, "id":674145, "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/674145?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/674145?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/674145?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }