Two of the world's largest volcanic tuff cones, with four smaller associated cones, that rise about 800 feet (250 m) above the surrounding Snake River plain
General Information
Rexburg, 12 miles
Idaho Falls, 23 miles
From Salt Lake City, UT (237 miles): Get on I-15 N. Follow I-15 N to W 145 N in Bonneville County. Take exit 128 from I-15 N. Take N 3400 E to N 3600 E in Jefferson County.
Overview
The Menan Buttes near Rexburg and Idaho Falls are two of the world's largest volcanic tuff cones, rising about 800 feet above the Snake River Plain (summit elevation 5,619 feet). They formed when basaltic magma met a shallow aquifer or river, causing explosive steam eruptions that built the cones from glassy tachylite ash. North Menan Butte is slightly larger, with a crater about 3,000 feet across. South Menan Butte has a hiking trail to the rim with wide views, while North Butte is mostly private.
This article uses material from the Wikipedia article "Menan Buttes", which is released under the Creative Commons Attribution-Share-Alike License 3.0
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