{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -87.44917, 33.25306 ] }, "properties":{ "provider":"SAM", "code":"Holt", "slug":"holt", "elevation":0.0, "horizontal_datum":"NAD83", "vertical_datum":"NGVD29", "state":"AL", "kind":"PROJECT", "nearest_city":"Northport", "public_name":"Holt Lock and Dam", "location_code":13731039, "nsid":null, "aliases":{ "CWMS Standard Naming":"Holt", "NIDID":"AL01426", "CWMS Legacy Naming":"Holt" }, "timeseries":[ { "tsid":"Holt.Precip-Inc.Total.15Minutes.15Minutes.Raw-USGS", "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":"Holt-Tailwater.Elev.Inst.1Hour.0.Raw-APCO", "label":"Elevation Tailwater", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T21:00:00Z", "latest_value":123.3, "delta24h":null, "sort_order":3, "results":null }, { "tsid":"Holt.Elev.Inst.15Minutes.0.Raw-USGS", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:00:00Z", "latest_value":186.86, "delta24h":null, "sort_order":1, "results":null }, { "tsid":"Holt.Flow-In.Inst.1Hour.0.Raw-APCO", "label":"Inflow", "base_parameter":"Flow", "parameter":"Flow-In", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T21:00:00Z", "latest_value":1983.28, "delta24h":null, "sort_order":6, "results":null }, { "tsid":"Holt-Spillway.Flow.Inst.1Hour.0.Raw-APCO", "label":"Surcharge Release", "base_parameter":"Flow", "parameter":"Flow", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T21:00:00Z", "latest_value":0.0, "delta24h":null, "sort_order":8, "results":null }, { "tsid":"Holt.Stor.Inst.15Minutes.0.Rev-USGS", "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":117532.2, "delta24h":null, "sort_order":13, "results":null }, { "tsid":"Holt.Flow-Out.Inst.1Hour.0.Raw-APCO", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Out", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T21:00:00Z", "latest_value":0.0, "delta24h":null, "sort_order":7, "results":null } ], "name":"Holt Lock and Dam", "hasResopsAverages":"false", "nidId":"AL01426", "nidid":"", "levels":[ { "slug":"elev.bottom of normal", "label":"Bottom of Normal", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Holt.Elev.Inst.0.Bottom of Normal", "latest_value":186, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Holt.Elev.Inst.0.Streambed", "latest_value":100, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Holt.Elev.Inst.0.Top of Dam", "latest_value":220, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of normal", "label":"Top of Normal", "parameter":"Elev", "base_parameter":"Elev", "tsid":"Holt.Elev.Inst.0.Top of Normal", "latest_value":187, "units":"ft", "units_long_name":"Feet" }, { "slug":"stor.bottom of normal", "label":"Bottom of Normal", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Holt.Stor.Inst.0.Bottom of Normal", "latest_value":114720, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.streambed", "label":"Streambed", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Holt.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":"Holt.Stor.Inst.0.Top of Dam", "latest_value":244916, "units":"ac-ft", "units_long_name":"Acre-feet" }, { "slug":"stor.top of normal", "label":"Top of Normal", "parameter":"Stor", "base_parameter":"Stor", "tsid":"Holt.Stor.Inst.0.Top of Normal", "latest_value":117990, "units":"ac-ft", "units_long_name":"Acre-feet" } ], "id":549803, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":58, "damLength":1400, "distance":2, "drainageArea":4232, "eapId":1, "dsacAssignedDate":"2020-11-12T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-08-07T12:00:00.000Z", "eapLastRevDate":"2021-09-21T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"AL01426", "oldFederalId":"AL01426", "hazardId":4, "hydraulicHeight":108, "inspectionAuthorityId":0, "inspectionDate":"2019-12-13T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":33.254051804, "lengthOfLocks":600, "secondaryLengthOfLocks":null, "longitude":-87.4494828379999, "maxDischarge":639500, "maxStorage":187400, "nidHeight":120, "nidStorage":187400, "normalStorage":117990, "numberOfLocks":1, "operationalStatusDate":"2020-11-12T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The Holt Lock and Dam is located on the Black Warrior River. The project includes a lock and dam at navigation mile 347.0 above the foot of Government Street, Mobile, Alabama. The project was authorized under provisions of the River and Harbor Act approved March 3, 1909 which granted the Secretary of War (now Secretary of the Army) discretionary authority to reconstruct obsolete navigation structures, subject to consideration and approval by the Board of Engineers for Rivers and Harbors and the Chief of Engineers. The project replaced obsolete locks 13, 14, 15 and 16. The project was completed in 1969.\n\nThe navigation lock provides a nominal chamber of 110 x 600 feet. The lift is 64 feet, with a depth of 13 feet over the miter sills. The gated spillway has fourteen 40-foot wide by 35-foot high gates. The 130-foot long non-overflow section has a powerhouse, constructed and operated by the Alabama Power Company. The 18.5-mile long lake created by this dam has an area of 3,300 acres, a capacity of 117,990 acre-feet at normal pool elevation 187.1 feet North American Vertical Datum (NGVD), and a 9 x 200 foot navigation channel extending its entire length", "riskCharSummary":"Breach risk for this dam has been asssessed to be very low. Flood inundation maps and breach consequence estimates have been for this dam since there is potential loss of life should it fail or be mis-operated. This dam has limited storage during normal and low water operations to ensure adequate flows to support navigation. This dam is not authorized, designed, or operated for flood damage reduction. In the unlikely event of a dam failure with low or normal water flows in the river, flooding nearby could occur. During high flow events, the dam is operated to pass water as quickly as it arrives. During a large flood, failure would result in flooding downstream. Flood mapping has been developed to indicate potential flooding extents during a range of river conditions for both breach and non-breach scenarios. These maps should be used by the public and state and local emergency managers for their awareness and preparedness in the event of a dam breach incident.", "riskManagementMeasures":"USACE manages dam-related flood risks by assessing the condition of the dam by monitoring and routine inspection. Regular maintenance and repairs are performed as needed to keep the dam functioning properly. USACE prioritizes maintenance and repairs that will most impact the risks, and engages upstream and downstream emergency managers and members of the public to raise awareness of the dam and support actions to prepare and be ready to respond in the case of a dam-related incident. USACE periodically updates the emergency action plan for this dam and periodically convenes with state and local emergency managers to share what is known about the dam and to support the development of state and local preparedness and response plans.", "riverName":"BLACK WARRIOR RIVER", "separateStructuresCount":1, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":560, "stateFedId":"AL01426", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":120, "submitDate":"2021-12-28T17:07:58.206Z", "surfaceArea":3300, "volume":160000, "widthOfLocks":110, "secondaryWidthOfLocks":null, "yearCompleted":1968, "congDist":"Congressional District 04, Alabama", "city":"HOLT", "county":"Tuscaloosa", "aiannh":null, "websiteUrl":"https://www.sam.usace.army.mil/Missions/Civil-Works/Recreation/Black-Warrior-Tombigbee-BWT-Lakes/", "coreTypeIds":"2;3", "damTypeIds":"9", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1;13", "fedOperationIds":"1", "fedOtherIds":"13", "fedOwnerIds":"1", "fedRegulatoryIds":"1;13", "formerNames":null, "foundationTypeIds":"1", "nonFederalDamOnFederalId":0, "designerNames":"Alabama Power Co.;CESAM", "otherNames":"Holt Lake", "ownerNames":"USACE - Mobile District", "ownerTypeIds":"3", "primaryDamTypeId":9, "primaryOwnerTypeId":3, "primaryPurposeId":3, "purposeIds":"3;5;6", "dsacId":5, "femaRegion":"4", "lastEapExcerDate":"2024-08-07T12:00:00.000Z", "dataUpdated":"2025-01-16T19:47:03.624Z", "usaceDistrict":"Mobile District", "noConsequencesId":0, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":1, "damStatusId":2, "huc06":"031601", "doi_region":null, "doi_region_name":"South Atlantic Gulf", "doi_region_number":2 }, "id":13731039, "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/13731039?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/13731039?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/13731039?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }