{ "bbox":null, "type":"Feature", "geometry":{ "bbox":null, "type":"Point", "coordinates":[ -79.95964, 40.00227 ] }, "properties":{ "provider":"LRP", "code":"Maxwell", "slug":"maxwell", "elevation":734.5, "horizontal_datum":"WGS84", "vertical_datum":"NGVD29", "state":"PA", "kind":"PROJECT", "nearest_city":"Washington", "public_name":"Maxwell L/D", "location_code":16467111, "nsid":null, "aliases":{ "NIDID":"PA00123" }, "timeseries":[ { "tsid":"Maxwell-Lower.Stage-Upper.Inst.1Hour.0.OBS", "label":"Stage", "base_parameter":"Stage", "parameter":"Stage-Upper", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T21:00:00Z", "latest_value":10.51, "delta24h":null, "sort_order":4, "results":null }, { "tsid":"Maxwell-Lower.Flow-Lower.Inst.1Hour.0.OBS", "label":"Outflow", "base_parameter":"Flow", "parameter":"Flow-Lower", "unit":"cfs", "unit_long_name":"Cubic feet per second", "latest_time":"2026-04-14T21:00:00Z", "latest_value":8270.0, "delta24h":null, "sort_order":7, "results":null }, { "tsid":"Maxwell-Lower.Stage-Lower.Inst.1Hour.0.OBS", "label":"Stage Tailwater", "base_parameter":"Stage", "parameter":"Stage-Lower", "unit":"ft", "unit_long_name":"Feet", "latest_time":"2026-04-14T21:00:00Z", "latest_value":10.4, "delta24h":null, "sort_order":5, "results":null } ], "name":"Maxwell L/D", "hasResopsAverages":"false", "nidId":"PA00123", "nidid":"", "levels":[ { "slug":"stage.streambed", "label":"Streambed", "parameter":"Stage", "base_parameter":"Stage", "tsid":"Maxwell.Stage.Inst.0.Streambed", "latest_value":0, "units":"ft", "units_long_name":"Feet" }, { "slug":"stage.top of dam", "label":"Top of Dam", "parameter":"Stage", "base_parameter":"Stage", "tsid":"Maxwell.Stage.Inst.0.Top of Dam", "latest_value":9, "units":"ft", "units_long_name":"Feet" } ], "id":549947, "associatedStructuresCount":0, "conditionAssessDate":null, "conditionAssessDetail":null, "conditionAssessId":6, "damHeight":null, "damLength":692, "distance":5, "drainageArea":4961, "eapId":1, "dsacAssignedDate":"2022-08-11T12:00:00.000Z", "eapMeetsGuidelinesId":1, "emergencyContactsUpdated":"2024-10-25T12:00:00.000Z", "eapLastRevDate":"2021-09-08T12:00:00.000Z", "enforcementAuthorityId":0, "federalId":"PA00123", "oldFederalId":"PA00123", "hazardId":3, "hydraulicHeight":31, "inspectionAuthorityId":0, "inspectionDate":"2021-06-04T12:00:00.000Z", "inspectionFrequency":5, "jurisdictionAuthorityId":0, "latitude":40.0022670000001, "lengthOfLocks":720, "secondaryLengthOfLocks":null, "longitude":-79.959644, "maxDischarge":120000, "maxStorage":30900, "nidHeight":56, "nidStorage":30900, "normalStorage":30900, "numberOfLocks":2, "operationalStatusDate":"2022-08-11T12:00:00.000Z", "operationalStatusId":1, "originalDesignerName":null, "otherStructureId":null, "permittingAuthorityId":0, "politicalPartyId":null, "privateDamId":null, "projectDescription":"The U.S. Army Corps of Engineers (USACE) completed construction of Maxwell Locks and Dam across the Monongahela River in 1965. The dam is located about 3.5 miles southwest of Brownsville, Pennsylvania and about 61 miles upstream of the confluence of the Allegheny and Monongahela Rivers in Pittsburgh, Pennsylvania. The purpose of the dam is to create a navigation pool from the dam upstream to Grays Landing Lock and Dam, which is located near Masontown, Pennsylvania. The dam is concrete and has five steel gates. The locks provide a lift of nearly 20 feet, from the pool downstream of the dam (lower pool) to the pool above the dam (upper pool). The locks allow river traffic to travel upstream or downstream of the dam. The locks consist of two adjacent rectangular chambers that are 84 feet wide by 720 feet long and are formed on each side by concrete walls and steel gates on the upstream and downstream sides. The pool created by the dam also provides water supply to five municipal and industrial intakes and provides recreational opportunities for the region. The economic benefit of shipping materials and goods through the lock, water supply, and recreation is more than 83 million dollars annually. The dam does not provide the nearby communities with any protection from flooding.", "riskCharSummary":"The most recent risk assessment of the dam was performed in 2021, which characterized the risk as very low. The assessment identified one primary scenario that could cause the dam to fail. During times of high river levels, barges in the upper pool could break loose and become trapped on the dam which could prevent one or more dam gates from closing. This could result in a loss of the upper pool such that the river level becomes too low to allow river traffic to continue. If the upper pool were lost, the primary consequence would be the loss of shipping and water supply, which would damage the regional economy by more than 136 million dollars per year. The economic damage would be temporary, until the upper pool could be restored to allow resumption of shipping, water supply, and boat recreation. Although three barge incidents have occurred at the dam in the past, the loss of pool has been less than two weeks in duration. Downstream flooding would not be expected if the dam were to fail and the upper pool was lost.", "riskManagementMeasures":"To ensure we are taking all steps to reduce the risk to the economy, we will continue to work closely with the Coast Guard, the Waterways Association, and the shipping industry to keep them aware of conditions at the dam and changes to lock operations. We regularly update our emergency action plan. We conduct routine monitoring and surveillance of the lock and dam. We closely follow rainfall forecasts to determine when high river events may occur to provide information for any necessary public or industry notifications. We closely monitor river levels and provide advisories if river levels may become unsafe for shipping. Information on river levels and forecasts are available to the public via the internet at: \n\nhttp://water.weather.gov/ahps2/forecasts.php?wfo=pbz", "riverName":"MONONGAHELA RIVER", "separateStructuresCount":0, "sourceAgency":"US Army Corps of Engineers", "spillwayTypeId":1, "spillwayWidth":420, "stateFedId":"PA00123", "stateRegulatoryAgency":null, "stateRegulatedId":0, "structuralHeight":56, "submitDate":"2023-02-16T17:25:41.851Z", "surfaceArea":1380, "volume":0, "widthOfLocks":84, "secondaryWidthOfLocks":null, "yearCompleted":1964, "congDist":"Congressional District 14, Pennsylvania", "city":"BROWNSVILLE", "county":"Washington", "aiannh":null, "websiteUrl":"https://www.usace.army.mil/Missions/Civil-Works/Dam-Safety-Program/Article/2870967/dam-safety-program/", "coreTypeIds":"2", "damTypeIds":"9", "fedConstructionIds":"1", "fedDesignIds":"1", "fedFundingIds":"1", "fedInspectionIds":"1", "fedOperationIds":"1", "fedOtherIds":"1", "fedOwnerIds":"1", "fedRegulatoryIds":"1", "formerNames":null, "foundationTypeIds":"1", "nonFederalDamOnFederalId":0, "designerNames":"CELRP", "otherNames":"Maxwell Pool", "ownerNames":"USACE - Pittsburgh District", "ownerTypeIds":"3", "primaryDamTypeId":9, "primaryOwnerTypeId":3, "primaryPurposeId":3, "purposeIds":"3", "dsacId":5, "femaRegion":"3", "lastEapExcerDate":null, "dataUpdated":"2025-06-02T12:00:00.000Z", "usaceDistrict":"Pittsburgh District", "noConsequencesId":1, "secretaryAgricultureBuiltId":null, "nrcsWatershedAuthorizationId":null, "isAssociatedStructureId":"No", "fedRegulatedId":"Yes", "inundationNidAddedId":2, "damStatusId":2, "huc06":"050200", "doi_region":null, "doi_region_name":"North Atlantic-Appalachian", "doi_region_number":1 }, "id":16467111, "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/16467111?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/16467111?f=jsonld" }, { "rel":"alternate", "type":"text/html", "title":"This document as HTML", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr/items/16467111?f=html" }, { "rel":"collection", "type":"application/json", "title":"USACE Access2Water API", "href":"https://api.wwdh.internetofwater.app/collections/usace-edr" } ] }