Deschutes National Forest

South Twin Lake Campground sits on the shores of South Twin Lake, a small lake adjacent to the much larger Wickiup Reservoir. The lake was formed about 20,000 years ago when rising magma-encountered groundwater resulting in violent steam explosions. The resulting explosions formed a broad shallow crater, which later filled with water. The lake covers an area of 99 acres with average depth of 33 feet with a maximum de…