Sneffels Rock Glacier originates on the north face of a minor peak east of Mount Sneffels. It begins below a very steep headwall at 3,888 m and ends around 3,440 m. It is 1000 m long and 188 m wide. Below the headwall, large snowfields persist annually due to the limited exposure to sunlight. The large volumes of talus in the region and lack of glacial landforms proximal to the rock glacier suggest a periglacial origin. The snowfield at the glacier’s head provides ice to cement the rock glacier together, while the talus above increases the volume of the rock glacier. This is the longest continuous rock glacier in the study area. The steep frontal slope at its terminus suggests it is a tongue-shaped rock glacier that is active