USDOT_BTS_NTAD_Dams eng; USA utf8 dataset Rebecca Ragon United States Army Corp of Engineers (USACE) National Inventory of Dams Manager 441 G Street NW Washington DC 20314 US nid@usace.army.mil pointOfContact 2026-07-24 ISO 19139 Geographic Information - Metadata ISO/TS 19139:2007 point 92766 3857 EPSG Dams 2013-07-01 creation 2026-07-22 publication 2026-07-22 revision United States Army Corp of Engineers (USACE) originator vector The Dams dataset is a representation of the National Inventory of Dams (NID), 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. It is also part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). The Dams dataset (NID) includes all known dams of the United States and its territories, 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. The information is updated periodically by the state and federal agencies, reflected by the "Data Last Updated Date". For more information on dams, visit the NID web site at https://nid.sec.usace.army.mil/#. A data dictionary, or other source of attribute information, is accessible at https://doi.org/10.21949/1529016 The National Inventory of Dams documents more than 90,000 dams in the U.S. and its territories. It serves as a national resource to support awareness of dams. Acknowledgment of the U.S. Army Corps of Engineers (USACE) https://nid.sec.usace.army.mil/# and the Bureau of Transportation Statistics (BTS) [distributor]. onGoing Rebecca Ragon United States Army Corp of Engineers (USACE) National Inventory of Dams Manager 441 G Street NW Washington DC 20314 US nid@usace.army.mil pointOfContact weekly NTAD National Transportation Atlas Database National Transportation Atlas Database vector point Marine Maritime Transportation Infrastructure Inland Waters Structure USACE Water Structures Dams Waterway Inland Hydrography Reservoir theme none USA National place none This NTAD dataset is a work of the United States government as defined in 17 U.S.C. § 101 and as such are not protected by any U.S. copyrights. This work is available for unrestricted public use. otherRestrictions Access Constraints: unrestricted National Transportation Atlas Database 2026-07-22 publication Bureau of Transportation Statistics (BTS) publisher largerWorkCitation vector eng; USA inlandWaters Native Dataset Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362 -176.6873 144.7061 0 71.266667 2026-07-17 0 Dams A data dictionary resource of attribute information is accessible at https://doi.org/10.21949/1529016 Bureau of Transportation Statistics (BTS) NTAD Program Manager 1200 New Jersey Ave. SE Washington DC 20590 United States ntad@dot.gov distributor None. No fees are applicable for obtaining the dataset. https://doi.org/10.21949/1522042 http Open Data Catalog Web page to view and download dataset. The file download formats available include: ESRI File Geodatabase or Shapefile, GeoPackage, Comma-Seperated Values (CSV), Microsoft Excel, GeoJSON, KML, Feature Collection, and SQLite Geodatabase. download https://doi.org/10.21949/1522044 http ArcGIS REST Services Directory Feature Server (WFS) complies with OGC WFS Map Service for visualizing geospatial information download https://doi.org/10.21949/1520844 http Repository and Open Science Access Portal (ROSA P) NTAD Archive Collection ZIP download dataset Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. The U.S. Army Corps of Engineers (USACE) closely collaborates with federal and state dam regulating agencies to obtain accurate and complete information about dams in the database. With the Nov 2021 release of the new NID web site, state and federal regulatory agencies can update their NID information at any time. However, providing updates to the NID is a voluntary action. Some agencies may update their information more frequently while others may update annually. Within the NID, there is a “Data Last Updated” date that reflects when an agency updated information for that specific dam. asNeeded Rebecca Ragon United States Army Corp of Engineers (USACE) National Inventory of Dams Manager 441 G Street NW Washington DC 20314 United States nid@usace.army.mil custodian