National Inventory of Dams 2026

This feature layer, utilizing National Geospatial Data Asset (NGDA) data from the U.S. Army Corps of Engineers (USACE), displays dams within the United States, Puerto Rico and Guam. Per the USACE, "The National Inventory of Dams (NID) consists of dams meeting at least one of the following criteria: 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 dams are typically equal to or exceed 25 feet in height and exceed 15 acre-feet in storage, or equal to or exceeding 50 acre-feet storage and exceeding 6 feet in height. The NID does not yet contain all dams in the U.S. that meet these criteria. Continued, routine updates to the NID and enhanced data collection efforts, focused on the most reliable data sources (primarily the many federal and state government dam regulatory programs), will help capture these dams and result in a more robust dataset over time." Hoover, Davis & Glen Canyon Dams Data currency: This cached Esri federal service is checked weekly for updates from its enterprise federal source (Dams) and will support mapping, analysis, data exports and OGC API – Feature access. NGDAID: 160 (National Inventory of Dams) For feedback please contact: [e-mail] Thumbnail courtesy of: Esri Basemaps Imagery This data set is part of the NGDA Water - Inland Theme Community. Per the Federal Geospatial Data Committee (FGDC), Water - Inland is defined as the "interior hydrologic features and characteristics, including classification, measurements, location, and extent. Includes aquifers, watersheds, wetlands, navigation, water quality, water quantity, and groundwater information." For other NGDA Content: Esri Federal Datasets本要素图层采用美国陆军工程兵团（U.S. Army Corps of Engineers, USACE）发布的国家地理空间数据资产（National Geospatial Data Asset, NGDA）数据，展示了美国、波多黎各及关岛境内的大坝。 据美国陆军工程兵团介绍，《国家大坝名录》（National Inventory of Dams, NID）收录满足以下至少一项标准的大坝：一是下游溃坝可能造成人员伤亡的大坝（高风险隐患）；二是下游溃坝可能导致关键设施通行中断、公私设施受损且需开展复杂减灾工作的大坝（显著风险隐患）；三是满足最低高度与库容要求的大坝——即便其生命或经济风险等级低于上述两类大坝，这类大坝通常坝高不低于25英尺且库容不低于15英亩-英尺，或库容不低于50英亩-英尺且坝高超过6英尺。 《国家大坝名录》尚未收录美国境内所有符合上述标准的大坝。通过持续常规更新该名录，并依托联邦与州政府大坝监管项目等可靠数据源强化数据采集工作，未来将逐步覆盖更多符合标准的大坝，逐步完善数据集质量。 本数据集包含胡佛大坝、戴维斯大坝与格兰峡谷大坝相关数据。 数据时效性：本缓存版Esri联邦服务每周都会从其企业级联邦数据源（大坝数据集）检查更新，可支持制图、分析、数据导出以及OGC API – Feature访问。 NGDA标识：160（国家大坝名录） 如需反馈，请联系：[e-mail] 本数据集缩略图由Esri影像底图提供。 本数据集隶属于NGDA水域-内陆主题社区。 据联邦地理空间数据委员会（Federal Geospatial Data Committee, FGDC）定义，水域-内陆主题涵盖内陆水文要素与特征，包括分类、测量、位置与范围，具体包含含水层、流域、湿地、航运、水质、水量及地下水相关信息。 如需获取其他NGDA内容，请访问：Esri联邦数据集