55
2,508
3,710
10,082
32,159
19,121
8,723
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
1800
1899
1919
1949
1969
1989
2015
Dams by Compleon Date
9%
2%
18%
6%
28%
6%
1%
0%
12%
1%
9%
7%
Dams by Primary Purpose
Fire Protecon, Stock, or Small Farm Pond
44,873
38,806
4,685
1,687
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
45,000
50,000
feet
Dams by Height
4%
20%
64%
7%
1% 4%
Dams by Owner Type
National Inventory of Dams (NID)
For more information please contact:The average age of a NID dam is 56
years.
Approximately 180 dams were
completed in 2013-2015.
The oldest dam in the NID is
Old Oaken Bucket Pond Dam in
Plymouth County, Mass., completed
in 1640.
493 dams are 200 feet or taller
19,194 dams are 15 feet or lower
Private owners represent the largest
dam owner group with more than
58,000 dams or approximately
64% of the entire inventory.
The federal government owns only
4% of the total NID, which includes
approximately 35% of the tallest
dams.
Dams serve multiple purposes,
water supply and recreation.
More than 25,000 (28%) of the dams
have a primary purpose of recreation
and 16,000 (18%) are
and storm
water management.
U.S. Army Corps of Engineers
7701 Telegraph Road
Alexandria, VA 22315-3864
703-428-6820
nid@usace.army.mil
http://nid.usace.army.mil
EP 360-1-23
NOV 2016
