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Erratic Rock State Natural Site

  COVID-19 Alert 03/23/20
COVID-19 Alert: All state parks will close March 23 until further notice. The closure includes all state parks, including all overnight campgrounds, trails, viewpoints, restrooms, and picnic areas and all other facilities. This is part of the statewide effort to reduce transmission of COVID-19.

Major Features & Activities

  • Blue Indicates that some, but not all, facilities are accessible.
Major Features & Activities:
  • Hiking Trails
  • Viewpoint
  • Exhibit Information

This 90-ton rock was deposited during an Ice Age flood. It floated over 500 miles in an iceberg 12,000 to 17,000 years ago,  by way of the Columbia River. When the ice melted, the rock was left behind. This is the largest glacial erratic found in the Willamette Valley. It is a type of rock not normally found in Oregon because it came from the Northern Rocky Mountains. Visitors at Erratic Rock can look out across the vast landscape and imagine the huge amount of water that filled the Willamette Valley during the Ice Age Floods.