1901 Map of Mt. Lyell

About this map

Mt. Lyell stands as the dramatic centerpiece of this High Sierra landscape, marking the point where the boundaries of Mono, Tuolumne, and Madera counties meet. Surveyed at the end of the 19th century, the map documents the pristine hydrology of the Ritter Range, where snowmelt feeds into Thousand Island Lake and Garnet Lake before descending toward the San Joaquin River. The eastern slopes reveal a distinct volcanic character in Pumice Valley and at Devil Postpile, contrasting with the granite peaks to the west.