Boulder Campground and Day Use Area is adjacent to Rock Lake Public Landing. The campsites are considered "primitive," designed to furnish only the basic needs of the camper. The 20 drive-in campsites consist of a cleared area, fire ring, and table. Vault toilets, garbage cans, and drinking water are available. The day-use area features six picnic sites.
Boulder Campground and Day Use Area offers a great alternative to the more developed and heavily used St. Croix State Park.