Crescent Glacier is located on the southeast slopes of Mount Adams in the U.S. state of Washington in Gifford Pinchot National Forest. A small subpeak of Mount Adams, named South Butte, rises nearby. Crescent Glacier is close to the Gotchen Glacier which is located just to the east. Crescent Glacier lies in a small south-facing cirque with a steep headwall. The glacier ranges in elevation from 8,400 ft (2,600 m) at the foot of the steep cliff to 7,900 ft (2,400 m) at the moraine. One arm of the glacier extends south down to 7,600 ft (2,300 m).