Beaverhead impact structure

{{Short description|Impact structure in the United States}}

{{Infobox terrestrial impact site

| name = Beaverhead impact structure

| photo = Beaverhead shatter cone.jpg

| photo_caption = A shatter cone produced by the Beaverhead impact

| map = Idaho

| map_size = 250

| map_caption = Location of Beaverhead impact structure in Idaho

| coordinates = {{coord|44|36|N|113|0|W|format=dms|display=inline,title}}

| confidence = confirmed{{cite Earth Impact DB | name = Beaverhead | access-date = 2015-01-02}}

| diameter = {{convert|60|km|mi}}

| age = 600 million years

| exposed = Yes

| drilled = No

| country = United States

| state = Idaho, Montana

}}

The Beaverhead impact structure is the second-largest impact structure within the U.S. It lies within the states of Idaho and Montana. Estimated at {{convert|60|km|mi|sp=us}} in diameter, it is among the largest impact structures on Earth.

With an estimated age of 600 million years (Neoproterozoic), the impact's original shatter cones along the impact structure's perimeter provide some of the structure's only remaining visible evidence.

It is named for the Beaverhead region of southwestern Montana in which it was first discovered.