- I -
- Ice Mountain - 13,951' -
- July 18, 1998 - Chris Wetherill
- August 28/29, 1999 - Dave Cook
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- Indian Peaks Wilderness
- See Crater Lake, Lone Eagle Peak, Pawnee Pass
- August 8, 1999 (High Lonesome Trail)- Brian Rachford's Home Page
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- Iowa Peak - 13,831' -
- September 3, 1993 - Chris Wetherill
- August 3, 1995 - Brian Rachford's Home Page
- September 5-7, 1997 - Los Alamos Mountaineers Club
- June 26, 2001 - Steve Bremner
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- Iron Nipple - 13,500'
- September 4, 1999 - Steve Bremner