Kooser State Park is a 250-acre (101 ha) Pennsylvania state park in Jefferson Township, Somerset County, Pennsylvania, in the United States. The park, which borders Forbes State Forest, was built in the 1930s by the Civilian Conservation Corps, who also built the 4-acre (1.6 ha) Kooser Lake by damming Kooser Run. Kooser State Park is on Pennsylvania Route 31 a one-hour drive from Pittsburgh. The park is surrounded by Forbes State Forest.