Ketchum says that Wood-Tikchik is divided into a three-tier system. The upper tier is the peak section, where many of the present glacial remnants and snow caps reside. The middle tier is the base of the peaks and valley floors. Within the middle tier reside the majority of Wood-Tikchik's lakes and famous fishing rivers. The bottom tier includes the flow of Wood-Tikchik's water across the tundra, and into Bristol Bay.