Hole-in-the-Ground, Volcanic crater in Lake County, Oregon.
The Hole-in-the-Ground spans one mile across with steep walls descending 490 feet below the surrounding terrain and a rim rising 210 feet above ground level.
The crater emerged between 13,500 and 18,000 years ago when magma interacted with groundwater, causing explosive steam reactions that ejected massive rock fragments.
Native Americans inhabited the Fort Rock Basin area near the crater, leaving behind artifacts and establishing connections to this geological formation over generations.
Visitors can reach the crater by following U.S. Route 97 south through La Pine, then taking State Highway 31 east for 22 miles to the designated signs.
The explosion that formed this crater propelled rocks weighing up to 26 feet in diameter as far as 2.3 miles from the site.
Location: Lake County
Elevation above the sea: 1,420 m
GPS coordinates: 43.40290,-121.19800
Latest update: March 6, 2025 20:30
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