Fort Randall Dam
The 928th tallest dam in the world
Fort Randall Dam is a 2.03-mile-long (3 km) earthen dam which spans the Missouri River and impounds Lake Francis Case, the 11th-largest reservoir in the U.S. The dam joins Gregory and Charles Mix counties, South Dakota, a distance of 880 river miles (1, 416 km) upstream of St. Louis, Missouri, where the river joins the Mississippi River. The dam and hydroelectric power plant were constructed by and are currently operated by the U.S. Army Corps of Engineers.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).