It impounds the south fork of the Sulphur River for municipal water supply and recreation.

His exploits turned him into a folk hero dubbed "The Swamp Fox of the Sulphur River".

The Sulphur River begins at the confluence of its north and south forks along the Delta-Lamar county line.

The Sulphur River provides numerous opportunities for fishing, boating, and other activities.

Two forks of the Sulphur River form its northern and southern boundaries, and meet at its easternmost point.

Located between the north and south forks of the Sulphur River, Cooper is the largest settlement within Delta County.

In 1868, people in the area petitioned the state government to create a new county located between the north and south forks of the Sulphur River.

Construction began in 1948, and the Sulphur River was blocked and routed through the dam's control gates in 1953.

The name derives from an early settler by the name of Hagan, who established a crossing on the Sulphur River.

The water is mainly from the Sulphur River, but several smaller creeks also flow into the lake.