A summit in the Central Cascades that requires technical experience, gear, and route-finding abilities. There are three ways to access Mount Index: from the east side of the mountain, from the west via Mount Persis, or from the east via the Proctor Creek drainage. This last one is a long and challenging bushwhack.
If you are attempting the Persis - Index traverse, you will need a recreational permit from Weyerhauser. Find it under the North Cascades - Chelan section on their site.