How many dams are estimated to be in the United States?

The estimate of over 75,000 dams in the United States is based on comprehensive surveys and data compilations from various agencies, including federal and state governments and other organizations. Such estimates account for dams that serve a variety of purposes including hydroelectric power generation, irrigation, flood control, water supply, and recreation.

The number of existing dams is significant because they play critical roles in water management and infrastructure across the country. The U.S. Army Corps of Engineers and the National Inventory of Dams (NID) provide a detailed directory that helps track these structures, which include not only large dams but also smaller ones that may not receive as much attention. Understanding the prevalence of these structures is essential for discussions regarding water resources, ecological impacts, and risk management related to dam safety.

This estimate also highlights the importance of ongoing maintenance, monitoring, and assessment programs for managing these dams effectively, considering aging infrastructure and potential safety hazards associated with their failure. Thus, the figure of over 75,000 accurately captures the scale of dam infrastructure within the United States.