The Adams Glacier is a large mountain glacier situated on the northwest flank of Mount Adams, a 12,276-foot (3,742 m) stratovolcano in the U.S. state of Washington. It is the largest glacier on Mount Adams, flowing down from the summit icecap at over 12,000 feet (3,700 m) for over 2.5 miles (4.0 km) to a terminus near 7,000 feet (2,100 m). Between 11,800 and 9,200 feet (3,600 and 2,800 m), the glacier flows through a steep icefall that provides challenging climbing through a maze of seracs. The first ascent of the glacier was by Fred Beckey, Dave Lind, and Robert Mulhall in July 1945. Below 8,400 feet (2,600 m), the glacier spreads into a broad sheet with five separate tongues of ice extending out to termini between large moraines. The glacier has decreased in surface area by 47% between 1904 and 2006.