Adopted 7 December 1950 for 94C, as labelled on Geological Survey sheet 787A, Aiken Lake, 1944, and on Geological Survey sheet 922A, Physiographic map of the Canadian Cordillera, 1948 (file A.1.42).

Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office

The Rocky Mountain Trench extends for 850 miles (1370 km) in British Columbia, along the west side of the Rocky Mountains from the 49th parallel to the Liard Plateau just south of the BC-Yukon boundary. The Trench is a geological fault zone separating the earth's plates, the rock here older than those of the Rocky Mountain Foothills on the east side of the Rockies. Except for the interruption of the McGregor Plateau, the Rocky Mountain Trench is a continuous valley - less than 5 miles wide for most of its' distance - the longest valley in North America, and one of the longest in the world. Portions of the Kootenay, Columbia, Canoe, Fraser, Parsnip, Finlay and Kechika Rivers are contained in the Rocky Mountain Trench, as are 3 huge reservoirs: Williston Lake, Kinbasket Lake and Koocanusa Lake (straddling the BC-Montana boundary).

Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office