Arapaho Bay Campground's Big Rock Loop offers 22 dirt sites at 8,300 feet elevation in the Arapaho National Recreation Area on Lake Granby, with reservations available May-September.

The loop features pit toilets, picnic tables, and fire rings, though it is heavily shaded with limited solar exposure and no water hookups.

Access requires 9 miles of dirt road from Highway 34, and the campground serves as a base for fishing, boating, hiking (including the Continental Divide Trail), and paddling on Lake Granby.