Elevation: 10,013 ft
Prominence: 22
Limited climbing and access information for this formation and its neighbors, Splinter Tower and Splinter Tower, is found on page 176 in the book. Brian Westphal has carefully evaluated the LiDAR data, researched the historical record and pinned down the exact location, elevation and prominence of all three towers. He has significantly updated the information found in the book. I have included Brian’s report for all three towers on the Splinter Tower page and in the website’s Climbing History section. Published April 2026
Thimble Tower is one of three rarely visited formations collectively known as the Splinter Towers. These towers are located just southwest of the West Pinnacle. USGS Mount Cramer
Summit Block, Class 5
This formation was climbed in 1948 by H. King and Fred Beckey. Exact detail are unknown. Beckey reported Thimble had 200 feet of “high angle slab” requiring at least two pitons for last 40 feet.
Additional Resources
Regions: Heyburn Divide->Sawtooth Range->WESTERN IDAHO
Mountain Range: Sawtooth Range
First Ascent Information:
- First Ascent Year: 1948
- Season: Summer
- Route: Summit Block
- Party: H. King and Fred Beckey
Longitude: -114.998854429 Latitude: 44.087740800