Name
Image
Date
Location
County
Ownership
Description
1
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.
2
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.
3
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 .
4
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.
5
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.
6
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.
7
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.
8
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.
9
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.
10
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.
11
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 .