| Bolam Glacier | |
|---|---|
| Type | Mountain glacier |
| Location | Siskiyou County, California, USA |
| Area | 0.4 miles² (1.1 km²) |
| Length | 1.4 miles (2.2 km) |
| Thickness | average 70 ft (21 m) |
| Terminus | moraine |
| Status | expanding |
The Bolam Glacier is a glacier situated on the northern flank of Mount Shasta, in the U.S. state of California.[1][2] It is the second longest glacier in California behind the nearby Whitney Glacier, and the fourth largest and most voluminous after the neighboring Hotlum Glacier, Whitney Glacier, and Wintun Glacier.[3]. The Bolam Glacier flows from a cirque on the north side of Mount Shasta's main summit, with the moving ice starting below a large bergschrund which spans the glacier at 12,600 ft (3,840 m)[4]. Above that, permanent snow and ice extends towards the summit to about 13,500 ft (4,100 m)[4]. The glacier flows north down a steep slope and terminates near 9,800 ft (3,000 m)[4].
In 2002, scientists made the first detailed survey of Mount Shasta's glaciers in 50 years. They found that seven of the glaciers have grown over the period 1951-2002, with the Hotlum and Wintun nearly doubling, the Bolam increasing by half, and the Whitney and Konwakiton Glaciers growing by a third.[5][6][7]
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