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Split Thumb is a 5,523 ft (1,680 m) glaciated mountain summit located in the Boundary Ranges of the Coast Mountains, in the U.S. state of Alaska.[4] The peak is situated near the southern periphery of the Juneau Icefield, 9 mi (14 km) northeast of Juneau, 2.15 mi (3 km) southeast of Nugget Mountain, and 4 mi (6 km) east of Heintzleman Ridge, on land managed by Tongass National Forest. Split Thumb is surrounded by the Lemon Creek Glacier to the west, and Norris Glacier to east. The Split Thumb Icefall is set on the east aspect of the peak.[5] This peak's descriptive name was published in 1951 by the U.S. Geological Survey.[4] The first ascent of Split Thumb was made July 2, 1954, by a Juneau Icefield Research Project party comprising Edward LaChapelle, Dick Hubley, Carlton Ray, Dr. Conrad Buettner, and Bob Goodwin.[6]

Split Thumb
Split Thumb, south aspect
Highest point
Elevation	5,523 ft (1,683 m)[1]
Prominence	923 ft (281 m)[1]
Parent peak	Mount Wrather[2]
Isolation	2.15 mi (3.46 km)[1]
Coordinates	58°24′23″N 134°18′44″W[1]
Geography
Split Thumb Location of Split Thumb in Alaska
Location	Tongass National Forest Juneau Borough Alaska, United States
Parent range	Coast Mountains Boundary Ranges Juneau Icefield[1]
Topo map	USGS Juneau B-1
Geology
Type of rock	granite
Climbing
First ascent	July 2, 1954
Easiest route	class 5.4 Southeast arête[3]

Climate

Based on the Köppen climate classification, Split Thumb is located in a subarctic climate zone, with long, cold, snowy winters, and cool summers.[7] Weather systems coming off the Gulf of Alaska are forced upwards by the Coast Mountains (orographic lift), causing heavy precipitation in the form of rainfall and snowfall. Temperatures can drop below −20 °C with wind chill factors below −30 °C. The month of July offers the most favorable weather to view or climb Split Thumb.

See also

• Geospatial summary of the High Peaks/Summits of the Juneau Icefield
• Geography of Alaska

References

External links

• Split Thumb weather forecast
• Flickr photo: Split Thumb Icefall
• Photo: "Split Thumb"
• Account of first ascent: Americanalpineclub.org
• Climbing Split Thumb: YouTube

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