Garrison Dam Tribes. Construction on the $300-million dam project began in 1947, and its embankment was enclosed in April 1953. The dam was dedicated by President Eisenhower two months later. The Corps of Engineers completed earthwork in the fall of 1954. Garrison Dam is one of six Missouri River Main stem dams operated by the U.S. Army Corps of Engineers, Omaha District. The dam upstream of Garrison Dam is Fort Peck Dam (near Fort Peck, Montana). The dams downstream of Garrison Dam are: Oahe Dam (near Pierre, South Dakota), Big Bend Dam (near Fort Thompson, South Dakota), Fort Randall Dam (near Pickstown,
Percha Dam State Park the spring and autumn migration seasons. Percha Dam State Park Percha Dam State Park is a state park of New Mexico, United States, located south of Truth or Consequences, New Mexico on the Rio Grande. The park itself encompasses approximately . The dam is less than downstream of the much larger Caballo Dam, and therefore Percha Dam's reservoir is essentially a wide, slow moving section of river. The dam's purpose is to raise the elevation of the Rio Grande slightly to allow irrigation of the chile pepper crop downstream. The park is popular for fishing, rafting, kayaking, and bird watching,