Jim Chapman Lake (also known as Cooper Lake) is a 19,305-acre (78.12 km2) impoundment operated by the Army Corps of Engineers and is located 75 miles (121 km) east of the Dallas/Fort Worth Metroplex in the state of Texas.

[1] The reservoir was created by the 1991 Jim Chapman Dam and impounds the South Sulphur River, a fork of the Sulphur River.

The Texas Parks and Wildlife Department’s Cooper Lake State Park is located on Jim Chapman Lake.

[2] The lake was formerly known as Cooper Lake, but was renamed by an act of Congress in 1998 to honor Jim Chapman, a former congressman from nearby Sulphur Springs.

[3] Cooper Lake State Park retains the earlier name.