Located near Oregon, Illinois, this state park is a beautiful natural area along the Rock River in Ogle County. It is named for a prominent sandstone bluff (Castle Rock) that overlooks the river.
​Key Features & Natural Beauty
​Castle Rock: The park's namesake is an exposed bluff of St. Peter Sandstone, a unique geological feature in Illinois. You can climb to an overlook for breathtaking views of the Rock River Valley.
​Unique Ecosystems: The park is part of the Rock River Hills region, featuring rolling topography, ravines, and diverse plant life. A significant portion of the park is designated as an Illinois Nature Preserve to protect unique native forest and prairie remnants.
​"Sinnissippi" (Rocky Waters): The Rock River, which runs along the park, was named Sinnissippi (meaning "rocky waters") by Native American tribes who inhabited the region.
​Activities
​The park offers a variety of outdoor recreational opportunities:
​Hiking: Approximately 6 miles of marked hiking trails are available, leading through woodlands, prairies, and offering scenic overlooks.
​Boating & Fishing: A public boat ramp provides access to the Rock River. Anglers enjoy fishing along the 1.5 miles of bank, often catching catfish, bass, and crappie. Primitive camping is available on an island, accessible only by boat.
​Picnicking: Three main picnic areas are available with tables, shelters, grills, and playground equipment. One site offers a spectacular view over the river valley.
​Seasonal Activities: Cross-country skiing and tobogganing are available during winter months, weather permitting.