Riverside State Park is a 10,000-acre camping park along the Spokane and Little Spokane rivers in Eastern Washington. The park supports a wide variety of recreational activities and is rich in history. Freshwater marshes, running rivers and beautiful countryside make up the terrain. The park also includes the Nine Mile Recreation Area, which is available for camping, picnicking, swimming, fishing and boating. The Civilian Conservation Corps developed the park from 1933 to 1936. The area was a major gathering site for Native American cultures in prehistoric times. The park contains the oldest log structure in Spokane County.

Riverside State Park is a 2020 Park Improvement Project Grant recipient.