At first Diller thought the tree was rooted to the bottom and might constitute evidence that Crater Lake’s surface had risen over time. Later, Diller established that the tree was mobile by tying bailing wire to the exposed portion and pulling it a short distance. Over the years, the lake became a minor tourist attraction and the Old Man became a celebrity.
Why the Old Man floats so serenely, and has not become completely waterlogged and sank, or rotted, remains something of a mystery. The generally accepted theory is that the tree fell into the lake, presumably carried there by a landslide, taking along sufficient rocks trapped among its roots, to weigh it down and set it bobbing. Over time, the roots decayed and the rocks tumbled into the depths, but by then the trunk had become waterlogged, and the weight of that water kept it vertical. Whereas the four feet above the water dried out in the sun, and gave the Old Man just sufficient buoyancy to remain afloat. The cold water prevented the wood from rotting.
An outstanding feature of the Old Man is that it travels extensively throughout the lake. In 1938, park naturalist John Doerr spent three months tracking its travel patterns, and found that within that period, the tree moved 62 miles, and on one one particularly windy day, it traveled 3.8 miles.
Soon a legend rose that the Old Man controlled the weather. In 1988, during a submarine expedition of the lake, scientists tied him up near Wizard Island to avoid the tree bumping into the submarine. The story goes that the moment they did, the sky grew dark, and a storm blew in. The skies miraculously cleared only when the Old Man was released.
A park ranger demonstrates the buoyancy of the Old Man of the Lake. Circa 1930.