Recreational activities include hiking, biking, horseback riding, fishing, boating, swimming and camping. Facilities include 110 RV campsites, 10 of which have full-hookups and 100 that are semi-modern. All sites are paved and offer 30 amp or 50 amp service plus water. Big rig sites, shaded sites and 35 tent sites are also available. Foss State Park has an equestrian camp with a multi-purpose trail for horseback riding, hiking and mountain biking. Horse rental is not available. The park also features picnic areas, group picnic shelters, grills, fire rings, comfort stations with showers, lighted boat ramps, boat storage, boat rentals, playgrounds, swimming beach and a seasonal marina.
Foss Reservoir was created by the United States Bureau of Reclamation in 1961 by impounding the Washita River. The dam is 142 feet (43 m) high. The reservoir, with a capacity of 436,812 acre-feet and a surface area of 13,141 acres (5,318 ha), provides regulation of river flows and municipal supplies for the nearby cities of Clinton, Cordell, Hobart, and Bessie. Water is conveyed from the reservoir to the project cities through 50 miles (80 km) of aqueducts and laterals.