A high volcanic plateau in southwest Colorado guarding one of the largest alpine tundra expanses in the contiguous United States.
Powderhorn Wilderness
Powderhorn Wilderness is a roughly 62,000-acre protected wilderness area in the San Juan Mountains of southwestern Colorado, spanning Hinsdale and Gunnison counties and lying just northeast of the small town of Lake City. The area sits on the edge of the San Juan volcanic field, where ancient Oligocene ash flows and younger basaltic lava from the Hinsdale Formation built up a sweeping highland plateaus landscape. Roughly half of the wilderness lies above tree line, producing one of the largest continuous expanses of alpine tundra in the contiguous United States.
Beyond its volcanic geology, Powderhorn is a critical watershed for the Gunnison River system. East, Middle, and West Forks of Powderhorn Creek, along with Calf Creek, drain through the wilderness into Cebolla Creek and ultimately the Gunnison. Glacial action carved cirques, lakes, and broad basins, while the surrounding vegetation shifts from sagebrush steppe at the lowest elevations through aspen and subalpine fir forests up into windswept tundra. Mule deer and elk migrate into the high country each summer, sharing the slopes with black bears, mountain lions, and smaller alpine-adapted species such as pikas and marmots.
Designated as a federal wilderness in 1993 and managed jointly by the Bureau of Land Management and the U.S. Forest Service, Powderhorn is set aside to preserve its primitive character, wildlife habitat, and watershed values. Travel is restricted to foot and horse, ensuring that visitors experience a quiet, largely trail-based landscape shaped by rock, ice, and open sky.
