National Inventory of Dams
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 Public) and will support mapping, analysis, data exports and OGC API – Feature access.