The Index is a block topped tower just west of Animas Mountain (13,786) deep in the Weminuche Wilderness. It may well be the most difficult summit in Colorado named by the USGS. It was first ascended in 1934 by Mel Griffiths, H.L. McClintock, and Frank McClintock. The rock of the actual tower is superb for San Juan standards though it is quite a soft scree slog approach. Extra points if you avoid smashing any wildflowers along the way. You should almost assuredly have complete isolation from the rest of humanity on this peak. The hardest part of the climb may be finding the Ruby Creek trail and then the correct access gully. Once you harness up, the real crux is over.
Approach via the Ruby Lake trail. From Needleton, head upstream away from everyone else going to Chicago Basin. You'll pass through one meadow after 1/3 mile or so and enter another after an additional 1/3 mile. Looking around you may see several cut logs turned on end as chairs around a fire pit. You may also notice that the trail pretty much disappears. Head to the east side of the clearing and look for the Ruby trail. Look around hard if you don't find it at first. You want to make sure you find it. It's there. It's about 2-3 hours on a steep trail to the lake and another hour to the upper basin. The Index is easy to spot from the lake but much less obvious from higher up. From the upper basin, Animas Mountain is a large mess of blocks and towers to the north. Look for the largest gap between two rocky massifs with a small, triangular tower between creating something of a W shape. Do not head into this gully. Instead tend more west and climb into the next gully to climber's left. There is a large chockstone guarding the top of the gully that can either be tackled directly or easily (5.0) to the right. Once out of the gully, look uphill and the Index is the tallest of the three towers 200 feet above you. Head to the base of the shortest (left most) tower looking for a less than vertical hand crack and belay from there.
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Mountain Project's determination of some of the classic, most popular, highest rated routes for The Index:
Index by FA Route 5.9 Trad, Alpine, 4 pitches, 200 feet, Grade II
Featured Route For The Index
Index by FA Route 5.9 CO : Alpine Rock : ... : The Index
From the bottom of the tower, climb 7 feet to a ledge that accesses a less than vertical handcrack (5.5, 15 feet, #3 Camalot). Belay off boulders just above the crack. Hop 50 feet around the base of the first tower and either rappel or downclimb (5.2, 30 feet) a gully to the east between towers 1 and 2. Set up a belay with medium stoppers. Climb easy fingers to hands to blocks to top of second tower (5.6, 60 feet) and belay off a slung boulder with a relic piton. Rappel to saddle betw...[more] Browse More Classics in CO