Big Springs is the only first-magnitude spring that issues from rhyolite lava flows. It is a National Natural Landmark designated in August 1980. The spring is in the Caribou-Targhee National Forest and the site is managed by the National Forest Service.
Big Springs is the only first-magnitude spring that emerges from rhyolite lava flows. It is a National Natural Landmark designated in August 1980. The site is managed by the National Forest Service, which oversees it.