Emerald Lake was discovered by an early guide named Thomas Wilson. Wilson got his start working as an assistant for A.B. Rodgers, who surveyed the Canadian Pacific route over the Rockies. Wilson discovered and named two different lakes Emerald Lake, but one of them was later renamed Lake Louise, which is east of the Continental Divide. This is the other Emerald Lake, which is in Yoho National Park west of the divide.
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This menu cover shows the lake with Wapta Mountain in the background, which is east of the lake. The menu is blank but the back cover is dated 1945 and notes that the Banff Springs Hotel, Chateau Lake Louise, and other Canadian Pacific lodges in the area were closed for the 1945 season.