Name
Image
Date
Location
County
Ownership
Description
Big Southern Butte
1976
Atomic City 43°24′05″N 113°01′26″W / 43.401389°N 113.023889°W / 43.401389; -113.023889 (Big Southern Butte )
Butte
federal (Bureau of Land Management )
A 2,500 ft Rhyolitic dome that rises over the Eastern Snake River Plain . It illustrates the scope and dimensions of Quaternary volcanism in the western United States.
Big Springs
1980
Island Park 44°30′01″N 111°15′19″W / 44.500278°N 111.255278°W / 44.500278; -111.255278 (Big Springs )
Fremont
federal (Caribou-Targhee National Forest )
The only first-magnitude spring in the country that issues forth from rhyolitic lava flows.
Cassia Silent City of Rocks
1974
Malta 42°04′34″N 113°42′06″W / 42.076026°N 113.701676°W / 42.076026; -113.701676 (City of Rocks )
Cassia
federal (City of Rocks National Reserve )
Monolithic landforms created by exfoliation processes on exposed massive granite plutons .
Crater Rings
1980
Mountain Home 43°11′27″N 115°51′35″W / 43.1907°N 115.8597°W / 43.1907; -115.8597 (Crater Rings )
Elmore
federal (Morley Nelson Snake River Birds of Prey National Conservation Area )
Two adjacent and symmetrical pit craters that are among the few examples of this type of crater in the continental United States.
Great Rift of Idaho
1968
Craters of the Moon National Monument and Preserve 43°27′42″N 113°33′46″W / 43.46167°N 113.56278°W / 43.46167; -113.56278 (Great Rift )
Blaine , Minidoka , Power
federal (Craters of the Moon National Monument and Preserve)
A tensional fracture in the Earth's crust.
Hagerman Fauna Sites
1975
Hagerman Fossil Beds National Monument 42°47′26″N 114°56′41″W / 42.7906°N 114.9448°W / 42.7906; -114.9448 (Hagerman Fossil Beds )
Twin Falls
federal (Hagerman Fossil Beds National Monument)
Contains the world's richest deposits of Upper Pliocene age terrestrial fossils.
Hell's Half Acre Lava Field
1976
Blackfoot 43°30′N 112°27′W / 43.5°N 112.45°W / 43.5; -112.45 (Hell's Half Acre Lava Field )
Bingham , Bonneville
federal (Bureau of Land Management)
Fully exposed pahoehoe lava flow.
Hobo Cedar Grove Botanical Area
1980
Shoshone 47°05′28″N 116°07′37″W / 47.0911°N 116.127°W / 47.0911; -116.127 (Hobo Grove )
Shoshone
federal (St. Joe National Forest )
An outstanding example of pristine western red cedar forest.
Menan Buttes
1980
Menan 43°36′N 111°30′W / 43.6°N 111.5°W / 43.6; -111.5 (Menan Buttes )
Jefferson , Madison
federal (Bureau of Land Management)
Contains outstanding examples of glass tuff cones, which are found in only a few places in the world.
Niagara Springs
1980
Hagerman 42°51′28″N 114°52′35″W / 42.85778°N 114.87639°W / 42.85778; -114.87639 (Niagara Springs )
Gooding
private
Least developed of the large springs discharging into the Snake River from the Snake River plain aquifer system.
Sheep Rock
1976
Council 45°11′30″N 116°40′17″W / 45.191651°N 116.67132°W / 45.191651; -116.67132 (Sheep Rock )
Adams
federal (Payette National Forest )
Horizontally layered lavas that represent successive flows on the Columbia River Basalt Plateau .