Foss State Park was formerly the home of several Plains Indian Tribes. Long ago, Native Americans who lived along the Washita River relied on the large herds of bison as a source of food, shelter, clothing and much more. Prior to statehood, the area was part of the Cheyenne-Arapaho Indian reservation. Many tribal members still live in the area surrounding Foss State Park today. The Great Western Cattle Trail ran through the area in the 1880s. The land was also farmed and ranched until the late 1950's before the lake was built. When the dam was finished in 1962, it was one of the largest earthen dams in the nation at 134-feet high and 3 miles long. With 8,800 surface acres of water and more than 60 miles of shoreline, Foss Lake is the largest lake in Western Oklahoma. The lake provides a valuable source of drinking water, an economical resource, educational opportunities, and a recreational facility that provides activities such as hiking, horseback riding, biking, swimming, fishing, water sports, camping and family activities for the citizens of western Oklahoma and surrounding states.