Hole-in-the-Ground

Hole-in-the-Ground is a volcanic crater measuring roughly one mile across with steep walls that drop about 490 feet below the surrounding landscape and a rim that rises about 210 feet above ground. The depression forms a nearly circular bowl with exposed rock walls showing the violent geological process that created it.

The crater formed between 13,500 and 18,000 years ago when underground magma met groundwater, triggering violent steam explosions. These powerful reactions excavated the deep depression that is visible today.

The crater sits within an area where Native Americans developed hunting practices and seasonal camps tied to the surrounding terrain. The geological formation became a landmark embedded in the daily life and knowledge of these communities.

The crater sits on a remote plateau and is best reached by car via unpaved roads, so a vehicle with good clearance is helpful. The site lacks shade and shelter from the elements, so bring water and sun protection for your visit.

The explosion hurled rock fragments weighing up to 26 feet in diameter as far as 2.3 miles from the impact zone, demonstrating the immense force of the eruption. These scattered debris pieces can still be spotted across the surrounding land by observant visitors.

Location: Lake County

Elevation above the sea: 1,420 m

GPS coordinates: 43.40290,-121.19800

Latest update: December 10, 2025 15:53