The upright log Crater Lake has tracked since 1896

A remarkably mobile landmark

Geologist Joseph Diller first sighted and tracked the log in 1896. That date marks its documented observation history; it does not establish when the tree entered the water. The National Park Service also reports a radiocarbon age exceeding 450 years for the wood. ¹

A formal study followed in 1938. From July through October, observers recorded 62.1 miles of travel. Its busiest recorded day in that study was August 6, when it moved 3.8 miles. The seemingly stationary stump was covering substantial distances. ¹

An unusual home for a floating tree

Crater Lake occupies a volcanic basin in southern Oregon’s Cascade Range. About 7,700 years ago, a major eruption was followed by the collapse of Mount Mazama. The caldera eventually became the setting for the deepest lake in the United States, which reaches 1,943 feet. ²

Rain and snow supply its water. With no river inlet or outlet, the lake’s level is regulated by evaporation and seepage, with modest changes from year to year. Steep walls frame a body of water averaging more than five miles across, giving the Old Man an extensive area to wander. ²

The striking blue around the log also has a physical explanation. The lake’s depth and clarity allow sunlight to interact with a large volume of water, absorbing longer wavelengths while scattering blue light. Wind, clouds and the Sun’s angle can change the appearance from one day to the next. ²

The balancing question remains open

The National Park Service presents possible explanations for the log’s upright position, including a denser, waterlogged lower section or rocks that once weighted its base. It explicitly describes these ideas as unproven. The observation record is extensive; the mechanism behind this particular log’s balance remains uncertain. ¹