At the southeast end of Island Lake is Waldo Tree. This inscribed Shasta red fir bears the carved names of early-day Oregon conservationist Judge John B. Waldo and four companions. In 1888, these men hiked south along the crest of the Cascades, from Waldo Lake to Mount Shasta. They were the first recorded party to travel much of the general route of what is now the Pacific Crest Trail.