[4] 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 (3,800 m).

[5] Above that, permanent snow and ice extends towards the summit to about 13,500 ft (4,100 m).

[5] The glacier flows north down a steep slope and terminates near 9,800 ft (3,000 m).

[6] In 2002, scientists made the first detailed survey of Mount Shasta's glaciers in 50 years.

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