Bureau of Land Management, Idaho.
The St. Anthony Sand Dunes consists of 10,600 acres of clear, shifting, white quartz sand. Although much of the sand dunes is managed as a wilderness study area, the area is popular for high off-road vehicle use. Dunes up to 400 feet high attract riders from throughout the west. ORV users are strongly encouraged to avoid damage to vegetation and impacts to wildlife so that use of this unique area may continue. Others prefer to explore the dunes on horse and on foot.
Closure Information: The riding area on the west side of St. Anthony Sand Dunes, west of Egin Lakes Campground (aka. "the big dunes") are closed from January 1 through sunrise on April 1. The area south of Egin - Hamer Rd is also closed from January 1 through sunrise April 1. The areas completely surrounding the the open sand of the St. Anthony Sand Dunes are closed from January 1 through sunrise on May 1. The smaller dunes, east of Egin Lakes Campground to Red Road are open year-round, but are usually covered in snow by January 1.
Located 8 miles west of St. Anthony.