Cooper Lake is a reservoir located in Delta County, Texas. It was created in the 1990s by damming the South Sulphur River and serves as a source of water supply, flood control, and recreational activities. The lake covers approximately 3,000 acres and offers opportunities for fishing, boating, and camping. It is surrounded by Cooper Lake State Park, which provides facilities for visitors, including picnic areas, hiking trails, and wildlife observation. The area is popular for its natural beauty and outdoor activities.