The Cochiti Dam is the 23rd largest dam in the world by volume of material and the 11th largest earthen dam in the world according to Wikipedia.
The Cochiti Lake provides for flood control, recreation, and wildlife habitatation. The recreation area includes two public areas: Cochiti on the west side of the lake and Tetilla Peak on the east side. Recreation includes sailing, wind surfing, kayaking, and fishing. There is a swim beach and playground. Facilities include campgrounds and campsites, many with water and electric hookups, as well as a large boat ramp, trails, visitors center, and picnic areas.
Video of Earthen Dam Construction (Army Corp of Engineers)
Time Lapse Video of Cranes over Lake (Steve Bentley)
Cochiti Lake Recreation Area
There are many opportunities for wildlife viewing. Four osprey nesting platforms have been erected around the lake to provide nesting sites, as well as viewing opportunities. On the east side of the lake, deer, coyote, and rabbit are often sighted.