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  • Added 15 Sep 2022

The Dams dataset was compiled on July 13, 2022 from the United States Army Corp of Engineers (USACE), and is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). This dataset includes all known dams of the United States, including Puerto Rico that meet the federal definition of a dam. Dams where downstream flooding would likely result in loss of human life (high hazard potential). Dams where downstream flooding would likely result in disruption of access to critical facilities, damage to public and private facilities, and require difficult mitigation efforts (significant hazard potential). Dams that meet minimum height and reservoir size requirements, even though they do not pose the same level of life or economic risk as those above – these low hazard potential dams equal or exceed 25 feet in height and exceed 15 acre-feet in storage, or equal or exceed 50 acre-feet storage and exceed 6 feet in height. The database contains more than 70 data fields for each dam. This includes the dam’s location, size, purpose, type, last inspection, and regulatory facts. It is maintained and published by the U.S. Army Corps of Engineers, in cooperation with the Association of State Dam Safety Officials, the states, territories, and federal agencies.


CategoryTransportation > Marine
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RegionsNorth America

Technical Details

Layer ID 110447
Data type Vector point
Feature count 91868
Attributes name, otherNames, formerNames, nidId, otherStructureId, federalId, ownerNames, ownerTypeIds, primaryOwnerTypeId, stateFedId, separateStructuresCount, designerNames, nonFederalDamOnFederalId, stateRegulatedId, jurisdictionAuthorityId, stateRegulatoryAgency, permittingAuthorityId, inspectionAuthorityId, enforcementAuthorityId, sourceAgency, latitude, longitude, county, state, city, distance, riverName, congDist, countyState, location, fedOwnerIds, fedFundingIds, fedDesignIds, fedConstructionIds, fedRegulatoryIds, fedInspectionIds, fedOperationIds, fedOtherIds, primaryPurposeId, purposeIds, primaryDamTypeId, damTypeIds, coreTypeIds, foundationTypeIds, damHeight, hydraulicHeight, structuralHeight, nidHeight, nidHeightId, damLength, volume, yearCompleted, yearCompletedId, nidStorage, maxStorage, normalStorage, surfaceArea, drainageArea, maxDischarge, spillwayTypeId, spillwayWidth, numberOfLocks, lengthOfLocks, widthOfLocks, yearsModified, outletGateTypes, dataUpdated, inspectionDate, inspectionFrequency, hazardId, conditionAssessId, conditionAssessDate, eapId, eapLastRevDate, websiteUrl, privateDamId, politicalPartyId, id, systemId, huc2, huc4, huc6, huc8, zipcode, nation, stateKey, femaRegion, femaCommunity,
Services Vector Query API, Web Feature Service (WFS)

Added 15 Sep 2022 ago
Last checked 15 Sep 2022 ago
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