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Abstract
Arapaho rock glacier is an ice-cored, tongue-shaped rock glacier in the Front Range of north-central Colorado. A 1985 resurvey of movement markers installed by H. A. Waldrop in 1960 indicates that surface debris near the center of the rock glacier is moving at an average velocity of 19.3 cm yr−1. Movement rates decrease downvalley and laterally from this position; a boulder at the base of the front has remained motionless. Movement velocities along the survey line are expected to become slower in the future, as the ice core at this location thins and compressive flow near the rock-glacier front causes surface slope to become gentler.