The structural volume of a dam is the total space occupied by the materials forming the dam structure computed between abutments and from top to bottom of dam. The abutment refers to the part of the valley side against which the dam is constructed.
The Fort Peck Dam of Montana USA, built in 1940 and one of the oldest major dams, is the largest dam in North America by structural volume at 96 million cubic meters.
The second-placed Oahe Dam is a large earthen dam on the Missouri River, just north of Pierre, South Dakota, United States. It is constructed with a structural volume of 70.3 million cubic meters and impounds Lake Oahe and 29 billion cubic meters of water.
The Gardiner Dam of Canada is one of the largest embankment dams in the world. The Gardiner Dam rises 64m in height and has a structural volume of 65.4 million cubic meters.