Clark State Forest, located just north of Henryville, Indiana in the United States, is Indiana's oldest state forest, formed in 1903 as a forest research facility and a nursery and later expanded by the Works Progress Administration. Originally 2,028 acres (8 km²) of total land area, it is now almost 24,000 acres (100 km2) and is bisected by Interstate 65. It features three trails used exclusively for hikers trails: two internal trails, and the 59-mile (95 km) Knobstone Trail. There are nine horse trails, and five miles (8 km) of mountain bike trails. Two nature preserves are also situated within the forest. The forest also contains a 100-yard (91 m) outdoor gun range.