Castle Rock Fishing Access Site offers primitive camping with spacious, private sites along the Stillwater River, featuring vault toilets, fire rings, and picnic tables with a 7-day stay limit and $12-18 camping fees.

The site includes a hand launch for non-motorized boating, an elevated cement lookout area for fishing, and accommodates RVs/trailers up to 20 feet, though there are no hookups or cell service.

Located 15 miles west of Absarokee on Highway 420, the area is known for excellent fishing access, scenic river views, and ADA-accessible facilities, but visitors should watch for snakes near the river and be prepared for rustic conditions.