{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -91.91989, 44.32748 ] }, "properties":{ "provider":"MVP", "code":"LockDam_04", "slug":"lockdam_04", "elevation":600.0, "horizontal_datum":"NAD83", "vertical_datum":"LOCAL", "state":"WI", "kind":"PROJECT", "nearest_city":"Alma", "public_name":"Lock and Dam 4", "location_code":4573016, "nsid":null, "aliases":{ "NIDID":"WI00727", "CWMS Legacy Naming":"LockDam_04", "CWMS Standard Naming":"LockDam_04", "NWS Handbook 5 ID":"ALMW3" }, "timeseries":[ { "tsid":"LockDam_04-Tailwater.Elev.Inst.~15Minutes.0.best-MSL1912", "label":"Elevation Tailwater", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:15:00Z", "latest_value":662.2, "delta24h":null, "sort_order":3, "results":null }, { "tsid":"LockDam_04.Flow-Out.Inst.~15Minutes.0.best", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Out", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T22:15:00Z", "latest_value":50395.61, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"LockDam_04.Elev.Inst.~15Minutes.0.best-MSL1912", "label":"Elevation", "base_parameter":"Elev", "parameter":"Elev", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T22:15:00Z", "latest_value":666.78, "delta24h":null, "sort_order":1, "results":null } ], "name":"Lock and Dam 4", "hasResopsAverages":"false", "nidId":"WI00727", "nidid":"", "levels":[ { "slug":"elev.bottom of conservation", "label":"Bottom of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"LockDam_04.Elev.Inst.0.Bottom of Conservation", "latest_value":666.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.bottom of normal", "label":"Bottom of Normal", "parameter":"Elev", "base_parameter":"Elev", "tsid":"LockDam_04.Elev.Inst.0.Bottom of Normal", "latest_value":666.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.streambed", "label":"Streambed", "parameter":"Elev", "base_parameter":"Elev", "tsid":"LockDam_04.Elev.Inst.0.Streambed", "latest_value":646, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of conservation", "label":"Top of Conservation", "parameter":"Elev", "base_parameter":"Elev", "tsid":"LockDam_04.Elev.Inst.0.Top of Conservation", "latest_value":667, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of dam", "label":"Top of Dam", "parameter":"Elev", "base_parameter":"Elev", "tsid":"LockDam_04.Elev.Inst.0.Top of Dam", "latest_value":677, "units":"ft", "units_long_name":"Feet" }, { "slug":"elev.top of normal", "label":"Top of Normal", "parameter":"Elev", "base_parameter":"Elev", "tsid":"LockDam_04.Elev.Inst.0.Top of Normal", "latest_value":667, "units":"ft", "units_long_name":"Feet" }, { "slug":"stage.bottom of normal", "label":"Bottom of Normal", "parameter":"Stage", "base_parameter":"Stage", "tsid":"LockDam_04.Stage.Inst.0.Bottom of Normal", "latest_value":66.5, "units":"ft", "units_long_name":"Feet" }, { "slug":"stage.streambed", "label":"Streambed", "parameter":"Stage", "base_parameter":"Stage", "tsid":"LockDam_04.Stage.Inst.0.Streambed", "latest_value":46, "units":"ft", "units_long_name":"Feet" }, { "slug":"stage.top of dam", "label":"Top of Dam", "parameter":"Stage", "base_parameter":"Stage", "tsid":"LockDam_04.Stage.Inst.0.Top of Dam", "latest_value":77, "units":"ft", "units_long_name":"Feet" }, { "slug":"stage.top of normal", "label":"Top of Normal", "parameter":"Stage", "base_parameter":"Stage", "tsid":"LockDam_04.Stage.Inst.0.Top of Normal", "latest_value":67, "units":"ft", "units_long_name":"Feet" } ], "id":549919, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":22, "damLength":7270, "distance":1, "drainageArea":57100, "eapId":1, "dsacAssignedDate":"2023-11-08T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-11-14T12:00:00.000Z", "eapLastRevDate":"1997-06-01T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"WI00727", "oldFederalId":"WI00727", "hazardId":3, "hydraulicHeight":27, "inspectionAuthorityId":0, "inspectionDate":"2022-08-08T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":44.32459285, "lengthOfLocks":600, "secondaryLengthOfLocks":null, "longitude":-91.92265881, "maxDischarge":269000, "maxStorage":878000, "nidHeight":42, "nidStorage":878000, "normalStorage":590000, "numberOfLocks":1, "operationalStatusDate":"2023-11-08T12:00:00.000Z", "operationalStatusId":2, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":0, "projectDescription":"The U.S. Army Corps of Engineers (USACE) completed Lock & Dam 4 in 1935. The project is located on the Mississippi River in Alma, Wisconsin. USACE operates Lock & Dam 4 primarily for navigation purposes, but congress also authorized USACE to make recreation improvements associated with the pool formed above the dam. Additionally, environmental management on the river is coordinated with the U. S. Fish & Wildlife Service, Minnesota and Wisconsin Departments of Natural Resources, and other state & federal agencies. The main components of the project include a lock, a gated spillway structure with 6 roller gates and 22 Tainter gates, and 1.1 miles of earthen embankments connecting these other components. The embankment has a crest elevation of 677.6 feet (NAVD 88) and a maximum height of 29 feet.", "riskCharSummary":"Mississippi River Lock and Dam 4 is a run-of-river dam that maintains a navigation pool for river traffic but does not store flood waters. The gated spillway is regulated to hold a constant pool level for navigation purposes at elevation 666.4 (feet, NAVD88) up to river flows of 89,000 cubic feet per second (cfs). The 89,000 cfs has an annual chance of exceedance of about 60% each year. Above this flow, the gates are fully opened and the dam has less than 1.3 feet of impact on the river stages. The maximum water level differential across the dam is 7 feet and occurs at low river flows. Based upon a risk assessment in 2023, USACE considers Mississippi River Lock and Dam 4 to have very low incremental risk in the event of a breach. Normal actions are programmed for routine dam safety activities, operations and maintenance. The risk assessment considered 72 failure modes with specific attention to deterioration of low-flow conduits through the embankment, corrosion of roller gates in the spillway, and towboat accidents impacting either the auxiliary lock miter gates or the spillway gates.", "riskManagementMeasures":"USACE is continuously taking steps to reduce the risk to the public. USACE manages dam-related flood risks by continually monitoring the condition and health of the dam and prioritizing activities that will most impact these risks. Regular maintenance and repairs are performed as needed to keep the dam functioning properly. Other hazards exist, such as swimming and boat safety in the vicinity of the dam. USACE regularly engages the public to raise awareness of the dam; and coordinates with state and county emergency managers (particularly during river flood events).", "riverName":"MISSISSIPPI", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":1130, "stateFedId":"WI00727", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":42, "submitDate":"2023-02-16T17:25:23.342Z", "surfaceArea":38820, "volume":484000, "widthOfLocks":110, "secondaryWidthOfLocks":null, "yearCompleted":1935, "congDist":"Congressional District 01, Minnesota", "city":"ALMA", "county":"Wabasha", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":"3", "damTypeIds":"11;8", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"3", "nonFederalDamOnFederalId":0, "designerNames":"CEMVP", "otherNames":"Pool 4", "ownerNames":"USACE - St. Paul District", "ownerTypeIds":"3", "primaryDamTypeId":11, "primaryOwnerTypeId":3, "primaryPurposeId":3, "purposeIds":"3;5", "dsacId":5, "femaRegion":"5", "lastEapExcerDate":"2019-09-04T12:00:00.000Z", "dataUpdated":"2024-11-14T12:00:00.000Z", "usaceDistrict":"St. Paul District", "noConsequencesId":1, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":2, "damStatusId":2, "huc06":"070400", "doi_region":null, "doi_region_name":"Great Lakes", "doi_region_number":3 }, "id":4573016, "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/4573016?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/4573016?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/4573016?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }