Denison Dam, also sometimes called Lake Texoma Dam is a dam on the Red River of the South, creating Lake Texoma, straddling the border between Texas and Oklahoma. Completed in 1943 primarily as a flood control project, it was at the time the "largest rolled-earth fill dam in the world"[1]. Only three times has the lake reached the dam's spillway at a height of 640 ft (195.07 m), first in 1957, then in 1990, and most recently, in July 2007. It takes its name from Denison, Texas, just downriver from the damface.