Mount Stephen, 3,199 m (10,495 ft), is a mountain located in the Kicking Horse River Valley of Yoho National Park, ½ km east of Field, British Columbia, Canada. The mountain is mainly composed of shales and dolomites from the Cambrian Period, some 550 million years ago. The Stephen Formation, a stratigraphical unit of the Western Canadian Sedimentary Basin was first described at the mountain and was named for it. Stephen has a subpeak known as Stephen SE1, at the end of a 1 km ridge, 132⁰ from the main peak, visible from Lake O'Hara.

The main route (a scramble) ascends slopes on the southwest face but requires much route finding and the final section of 125 m (410 ft) to the top is rated difficult. A cornice on the summit may prevent parties from reaching the top so if in doubt of conditions, attempts should wait until August. The route also passes through a fossil bed and thus requires a special park permit to be in the area. The elevation gain is 1,920 m (6,299 ft).

For rock climbers, a route on the north ridge is rated III 5.7 with generally good rock formations composed mainly of quartzite.

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History timeline chart

The mountain was named in 1886 for George Stephen, the first president of the Canadian Pacific Railway.

The first ascent was made on September 9, 1887 by James. J. McArthur and his assistant T. Riley


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