Willow Flat Campground is 3 miles south of Preston, Idaho on US Hwy. 91. Tturn east on the Cub River Road (road 406). 3 miles inside the Cache National Forest boundary road 406 and 407 intersect in a "Y". Take the right fork of the "Y" which is still road 406. Willow Flat Campground is 1.5 miles from this intersection on road 406. The second entrance accesses the reservation sites.