Willow Creek Campground is a primitive, free 9-site first-come, first-served campground located on the Middle Fork Boise River at the north end of Arrowrock Reservoir, offering direct river access for fishing and swimming along with vault toilets and fire rings at each site.

Access is via the narrow, rough Forest Road 268 (approximately 22 miles from Highway 21), which requires cautious driving but ensures a secluded experience; note that no potable water is available and the campground is typically closed by snow from late fall through spring.

The site is popular for trout fishing, wildlife viewing (deer, elk, osprey, and bald eagles), and hiking, with peak season from mid-May through late September.