| Facilities: Diamond Lake Campground provides an RV dump station, restrooms, and drinking water. Best Time To Visit: Diamond Lake Campground is open May through October. Fees: An overnight fee is charged. Accessibility: This campground is handicap accessible. Rules: The maximum length of stay is 14 days. Directions: To reach Diamond Lake Campground from Roseburg, travel east on State Highway 138 about 80 miles to Forest Road 4795. Go south on Forest Road 4795 about 3 miles to the campground. Map: Click here for a map to Diamond Lake Campground Reservations: Reservations are accepted for Diamond Lake Campground. Reserve your campsite at Diamond Lake Campground | 
