description Big Southern Butte Overview
Big Southern Butte is a prominent rhyolitic volcanic dome on Idaho's eastern Snake River Plain. It rises roughly 2,500 feet above the surrounding basaltic lava plain and reaches an elevation of about 7,550 feet, making it a major regional landmark visible across a broad area. The butte is relevant to geologists studying Snake River Plain volcanism and is also used for recreation and communications infrastructure.
help Big Southern Butte FAQ
How was Big Southern Butte in Idaho formed?
Unlike the surrounding basaltic lava plain, Big Southern Butte is a prominent rhyolitic volcanic dome. It formed when thick, sticky magma pushed up through the Earth's crust and hardened, creating a massive landmark on the eastern Snake River Plain.
Can you hike to the top of Big Southern Butte?
Yes, visitors can reach the summit of Big Southern Butte via a designated dirt road and trails that wind up the flanks of the mountain. Once at the top, hikers reach an elevation of about 7,550 feet, offering panoramic views of the Snake River Plain.
Why is Big Southern Butte so prominent on the Snake River Plain?
It stands out because it rises roughly 2,500 feet above the surrounding flat, basaltic lava flows. Its light-colored rhyolite rock also provides a stark visual contrast against the dark basalt of the eastern Snake River Plain.
Who manages the land around Big Southern Butte?
Big Southern Butte and its surrounding area are primarily managed by the Bureau of Land Management (BLM) and the U.S. Department of Energy. It is part of the Idaho National Laboratory reservation lands, requiring visitors to stay on designated public access routes.
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