National Inventory of Dams (NID)
For more information please contact:
U.S. Army Corps of Engineers
7701 Telegraph Road
Alexandria, VA 22315-3864
703-428-6820
http://nid.usace.army.mil
• The average age of a NID dam is 52
years.
• Approximately 120 dams were
completed in 2007.
• The oldest dam in the NID is
Old Oaken Bucket Pond Dam in
Plymouth County, Mass., completed
in 1640.
• 451 dams are 200 feet or taller
• 18,468 dams are 15 feet or lower
• Private owners represent the largest
dam owner group with more than
57,000 dams or approximately 70%
of the entire inventory
• The federal government owns only
4% of the total NID, which includes
approximately 40% of the tallest
dams
• Dams serve multiple purposes,
including ood damage reduction,
water supply and recreation.
• More than 28,000 (34%) of the dams
have a primary purpose of recreation
and more than 15,000 (18%) are
primarily for ood damage reduction
and storm water management.
EP 360-1-23
JUL 2010
