Routes
| Reference | Title | Grade | Length | Pro | Quality | Alert | Operations |
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| From Waimakariri Col, 1 | 1 | 0m | |||||
A short snow climb from Waimakariri Col. A traverse to, and descent off, Carrington Peak can also be achieved. The icecap of Mt Armstrong can be quite unstable at times, as can the glacier descending on to Waimakariri Col. |
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| From Otira Valley, 1 | 1 | 0m | |||||
A long climb that can be done by fit parties in a day from Otira. Follow the Rolleston River Route to where it leaves the scrub and crosses the river. Climb west to the spur separating the Rolleston River from the stream draining Lake Florence, and continue up to the summit. The icecap of Mt Armstrong can be quite unstable at times. |
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| South East Spur, II,2+ | II,2+ | 0m | |||||
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At the head of the Rolleston River make your way up through the rock buttress on the true-left of the river to gain access to the Southeast Spur, from here follow a line of good rock that takes you up to the 2010m point of the east ridge. The East Ridge can be followed all the way to the summit of Mt Armstrong. Starting as a broad ridge at 2010m, the east ridge progressively narrows until it involves climbing around some loose pinnacles of rock with a decent amount of exposure on both sides, before broadening out again just before the summit.
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| East Face, II,2+ | II,2+ | 400m | |||||
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From the head of the Rolleston River sidle north across the scree slopes on the true-left of the river to access the east face of Mt Armstrong. Towards the northeast corner of the face a large rock toe protrudes onto the scree and can be used as a starting point to climb up the face towards point 2010m directly above. The climb takes place on a mixture of good, solid rock and loose scree/rotten rock. Halfway up the face is a short but steep rock step that must be climbed. Once point 2010m is reached, follow the East Ridge all the way to the summit.
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