|Location||Siskiyou County, California, US|
|Area||.7 sq mi (1.8 km2)|
|Length||1.3 mi (2.1 km)|
|Thickness||67 ft (20 m) average|
The Hotlum Glacier is a glacier situated on the northeast flank of Mount Shasta, in the US state of California. It is the largest and most voluminous glacier in California, although not as thick or long as the nearby Whitney Glacier. The Hotlum Glacier flows from a large cirque on the northeast side of Mount Shasta's main summit below the Hotlum Headwall at roughly 13,600 ft (4,100 m). It flows northeastward down the steep slope, forming three lobes which terminate near 10,400 ft (3,200 m).
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 Glaciers nearly doubling, the Bolam Glacier increasing by half, and the Whitney and Konwakiton Glaciers growing by a third.
- "Hotlum Glacier". Geographic Names Information System. United States Geological Survey. Retrieved September 30, 2012.
- Driedger, Carolyn L.; Kennard, Paul M. (1986). "Ice volumes on Cascade volcanoes; Mount Rainier, Mount Hood, Three Sisters, and Mount Shasta". U.S. Geological Survey Professional Paper 1365. Retrieved March 6, 2007.
- Google Earth elevation for GNIS coordinates
- Harris, Stephen L. (2005). Fire Mountains of the West: The Cascade and Mono Lake Volcanoes (3rd ed.). Mountain Press Publishing Company. p. 109. ISBN 0-87842-511-X.
- Wong, Kathleen. "California Glaciers". California Wild. California Academy of Sciences. Archived from the original on October 6, 2006. Retrieved January 23, 2007.
- Whitney, David (September 4, 2006). "A growing glacier: Mount Shasta bucks global trend, and researchers cite warming phenomena". The Bee. Archived from the original on January 21, 2007. Retrieved January 23, 2007.
- "Existing Glaciers of Mount Shasta". College of the Siskiyous. Archived from the original on March 7, 2007. Retrieved January 23, 2007.
- "Glaciers of California". Glaciers of the American West. Glaciers Online. Archived from the original on September 3, 2006. Retrieved January 23, 2007.
- Bill Guyton (2001). Glaciers of California: Modern Glaciers, Ice Age Glaciers, the Origin of the Yosemite Valley, and a Glacier Tour in the Sierra Nevada. University of California Press. ISBN 0-520-22683-6.
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