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 at the foot of the steep cliff to at the moraine. One arm of the glacier extends south down to . Between 1904 and 2006, Crescent Glacier lost 6 percent of its surface area.