Cayoosh Range
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The Cayoosh Range is the northernmost section of the Lillooet Ranges, which are a subrange of the Pacific Ranges of the Coast Mountains in British Columbia. The range is c. 3770 sq km (1455 sq mi) and approximately 65km (40 mi) SW to NE and about 20 km (12 mi) SE to NW.
In some classification systems the Lillooet Ranges are considered their own group, and not a subdivision of the Pacific Ranges, although the Bendor Range, north of the Cayoosh Range across Anderson Lake, is classified as part of the Pacific Ranges which would tend to eimply that the Cayoosh and Lillooet Ranges are as well.
The Cayoosh Range is defined by the valley of Cayoosh Creek on the south, which is followed by the Duffey Lake Road section of BC Hwy 99, from Pemberton-Mount Currie to Lillooet, which are at the respective western and eastern ends of the range. Cayoosh Pass, between the head of Duffey Lake and the descent to the Pemberton Valley at Lillooet Lake, was first traversed by a non-native by Sapper James Duffey of the Royal Engineers in 1860, who investigated (then dismissed it) as a possible overland alternative to the Douglas Road. The north flank of the range is the valley of Seton and Anderson Lakes and the Gates River's divide via Pemberton Pass with the lower valley of the Birkenhead River, which is the far western perimeter of the range.
Named peaks in the range are confined the western end of the range, but the higher summits, all officially unnamed but well-known to climbers and hikers, are in the eastern part of the range. The western part of the range is coastal-alpine in character, with small glaciers and heavy snowfall. The eastern, higher part of the range verges on the semi-arid climate typical of the Fraser Canyon and the rest of the Interior and has no permanent snowfields or ice, and is known for its beautiful alpine meadows and stunning vistas of the surrounding ranges to the north, south and east.
The highest summit is an unnamed and largely unseen peak 2855 m (9367 ft) between the head of Seton Lake and the head of Downton Creek, which is a tributary of Cayoosh Creek. It is the second-highest summit in the Lillooet Ranges after Skihist Mountain, which is the Cantilever Range west of Lytton.
Other high peaks in the range The second-highest peak in the Cayoosh Range is Mount Marriott 2735 m (8973 ft), due south of D'Arcy {N'quatqua); it is not named for the hotel-empire family of the same name but for an RCAF officer who was killed in action in World War II. Other summits include Cayoosh Mountain 2561 m (8402 ft), Mount Oleg 2587 m (8488 ft), Saxifrage Mountain 2501 m (8205 ft), and Mount Rohr 2423 m (7949 ft).
