Foss Dam and Reservoir, on the Washita River in Custer County, provide regulation of the river flows and municipal and industrial water supplies for several cities in Oklahoma. The lake has approximately 6,800 water surface acres, 7,000 land acres and 63 miles of shoreline. Accessible from numerous roads. Several boat ramps and camping facilities. Predominate species include largemouth bass, crappie, catfish, and white bass. Fishing year-round.Foss Dam and Reservoir are features of the Washita Basin Project. Current Reservoir Levels